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  #1  
Old 09-25-2010, 07:08 PM
Godfrey Godfrey is offline
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Stingo Solid State Battery Charger

Hi Sucahyo,

In an earlier thread on Imhotepís car relay battery charger, you started sharing details about your Stingo battery charger circuit. Iím now working on a replication and would be grateful if you could answer some questions about it.

Here are some schematics Iíve put together for my own understanding:



The second circuit is a test configuration. If everythingís working, it should light the neon, right? Please let me know if you see anything amiss.

Iím actually using a 1M potentiometer instead of 500k, because thatís what Iíve got on hand. The resistors and potentiometers are all rated for ľ watt, and my capacitor is actually rated for 250v.

If itís all about generating and collecting the maximum back EMF, the secondary of the car ignition coil is not used, right?

What is the working source battery voltage range for driving a typical car ignition coil?

What is the frequency range? I remember you said it can get very high. Whatís appropriate for this type of coil?

Itís a type of complimentary multivibrator that Iím not familiar with. Can you describe its two states? Iím confused in particular as to how the emitter of the PNP transistor feeds the base of the NPN one. It would make more sense to me if it were the collector instead.

What exactly does the capacitor do? Is it a low frequency filter? Wonít it give the output wave a sinusoidal shape?

For charging smaller batteries, it would need a different coil that could be driven on smaller voltages than 12V, right?

Thanks ahead for your help.

- Godfrey
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Last edited by Godfrey; 09-27-2010 at 04:01 AM.
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  #2  
Old 09-27-2010, 02:39 AM
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sucahyo sucahyo is offline
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Quote:
Originally Posted by Godfrey View Post


The second circuit is a test configuration. If everything’s working, it should light the neon, right? Please let me know if you see anything amiss.
It suppose to lit but you don't need capacitor. You have to put atleast a diode if you intend to charge battery.

Quote:
Originally Posted by Godfrey View Post
I’m actually using a 1M potentiometer instead of 500k, because that’s what I’ve got on hand. The resistors and potentiometers are all rated for ľ watt, and my capacitor is actually rated for 250v.
My capacitor is rated for 250V too.

Quote:
Originally Posted by Godfrey View Post
If it’s all about generating and collecting the maximum back EMF, the secondary of the car ignition coil is not used, right?
Yes. I wound my coil without secondary. For safe operation, short the secondary.

Quote:
Originally Posted by Godfrey View Post
What is the working source battery voltage range for driving a typical car ignition coil?
From 3V to 24V, what ever you have and what ever output you need.

Quote:
Originally Posted by Godfrey View Post
What is the frequency range? I remember you said it can get very high. What’s appropriate for this type of coil?
Above audible range down to 50Hz depend on load, coil and resistor value.

Quote:
Originally Posted by Godfrey View Post
It’s a type of complimentary multivibrator that I’m not familiar with. Can you describe its two states? I’m confused in particular as to how the emitter of the PNP transistor feeds the base of the NPN one. It would make more sense to me if it were the collector instead.
Sorry, I can't explain it either. I found it by accident. That is more efficient than using the PNP in a normal way. Harvey suggest an SCR to replace it but for me, TIP32C is more obtainable and cheaper.

Quote:
Originally Posted by Godfrey View Post
What exactly does the capacitor do? Is it a low frequency filter? Won’t it give the output wave a sinusoidal shape?
To increase efficiency, to prevent too much normal electricity flowing to the load.

In my opinion, the spike is bouncing, so by using FWBR I get the weaker reverse bounce too and I use capacitor to prevent the load from getting powered by the source battery.

Quote:
Originally Posted by Godfrey View Post
For charging smaller batteries, it would need a different coil that could be driven on smaller voltages than 12V, right?
I am using same circuit to charge any kind of battery between 1.5V to 12V. I don't think you can make 1.5V nicad overheat if you only use one stingo
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  #3  
Old 09-27-2010, 05:39 AM
SeaMonkey SeaMonkey is offline
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Quote:
Originally Posted by sucahyo View Post

Sorry, I can't explain it either. I found it by accident. That is more efficient than using the PNP in a normal way. Harvey suggest an SCR to replace it but for me, TIP32C is more obtainable and cheaper.

To increase efficiency, to prevent too much normal electricity flowing to the load.
The PNP Transistor is connected to operate in what
is known as "inverse mode." The Collector is functioning
as the Emitter and the Emitter is functioning as the
Collector.

By working in "inverse mode" it effectively reduces the
base drive to the NPN Switching Transistor thereby
preventing it from being overdriven.

The Current Gain (Beta) of a transistor in inverse mode
is approximately 10% of normal gain.

To attain the same effect with the PNP Transistor
in normal mode a variable resistor could be connected
in series with the NPN Base lead in order to "tune"
base drive for maximum efficiency.

There is nothing wrong with "inverse mode" operation.
It is seldom used but a good "trick" to remember when
it can be taken advantage of.
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Old 09-27-2010, 06:00 AM
7imix 7imix is offline
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Godfrey, thanks for starting this thread, and sucahyo, thanks for discovering the stingo. :-)

The stingo is absolutely my favorite thing to experiment on, and I anticipate it will continue to be. I have had so much fun building a couple and experimenting with them. The stingo sparker is my favorite. I have tried replicating the modification with a brushed dc motor but I don't have exactly the right parts and it is not working as it should.

I have been performing some measurements with my little scope and my nice new high voltage probe. With the spark gap running I have measured up to about a megahertz. With no load I was able to get way up high above audible range, something like 25mhz. I will measure again and take more accurate notes.

I measured about 2000 volts off the high voltage side, which seems a bit low to me. I will go back and double check my measurements. Also, I measured about 800 volts with the probe just in the air, a few feet away from the apparatus! It diminishes as I move the probe radially outwards. I will take a movie of this. It's quite interesting.

I also did some experiments hooking up some capacitors and bars, hairpin style. I was able to get it to light a couple of neon bulbs. Will definitely do more experiments with this! Awesome.

I need to get my camera charged and take some video. I have lots of observations to share.

Thanks again sucahyo! Your circuit is great!
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Old 09-27-2010, 06:22 AM
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sucahyo sucahyo is offline
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Quote:
Originally Posted by 7imix View Post
I have been performing some measurements with my little scope and my nice new high voltage probe. With the spark gap running I have measured up to about a megahertz. With no load I was able to get way up high above audible range, something like 25mhz. I will measure again and take more accurate notes.
That is very high. That is not a typo?

How many volts at low voltage side?

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Originally Posted by 7imix View Post
Thanks again sucahyo! Your circuit is great!
Thank you. I really glad if my circuit is usefull .
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Old 09-27-2010, 07:24 AM
7imix 7imix is offline
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Quote:
Originally Posted by sucahyo View Post
That is very high. That is not a typo?
You're right, it was a typo. I meant kHz.

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Originally Posted by sucahyo View Post
How many volts at low voltage side?
I'll measure.
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Old 09-28-2010, 05:18 AM
Godfrey Godfrey is offline
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Hi All,

Thanks for your posts Sucahyo. I forgot to ask you about the knobs. What do the two potentiometers control. I assume one is for frequency, but not sure which.

Quote:
Originally Posted by Sucahyo
Yes. I wound my coil without secondary.
You wind your own coil for your Stingo? Air core or ferrite? Iím using an eBay bought cheapo car ignition coil.

Quote:
Originally Posted by Sucahyo
For safe operation, short the secondary.
Would it be better to short the HV output to the case rather than the negative terminal? Iíve noticed from continuity testing that they arenít the same thing.

Quote:
Originally Posted by Sucahyo
In my opinion, the spike is bouncing,
I agree. Coil ringing may be a factor too.

Quote:
Originally Posted by Sucahyo
so by using FWBR I get the weaker reverse bounce too
Good idea to use FWBR!

Quote:
Originally Posted by Sucahyo
and I use capacitor to prevent the load from getting powered by the source battery.
So the cap is a DC filter? What load are you talking about? The charging battery?

Quote:
Originally Posted by SeaMonkey
The PNP Transistor is connected to operate in what is known as "inverse mode." The Collector is functioning as the Emitter and the Emitter is functioning as the CollectorÖa good "trick" to remember when
it can be taken advantage of.
Thanks so much for that very helpful information, SeaMonkey!

Quote:
Originally Posted by 7imix
I need to get my camera charged and take some video. I have lots of observations to share.
Thanks, 7imix - Great input! Iím looking forward to your video, scope shots and further measurements.

Quote:
Originally Posted by Sucahyo
Above audible rangeÖThat is very high. That is not a typo?
Isnít the top of the human audible range around 20kHz?

- Godfrey
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Old 09-28-2010, 06:41 AM
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sucahyo sucahyo is offline
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Quote:
Originally Posted by Godfrey View Post
Thanks for your posts Sucahyo. I forgot to ask you about the knobs. What do the two potentiometers control. I assume one is for frequency, but not sure which.
All potentiometer change frequency. But each have different most efficient position that change with the load. If you have two amp meter, you can know the position on spesific load.


Quote:
Originally Posted by Godfrey View Post
You wind your own coil for your Stingo? Air core or ferrite? I’m using an eBay bought cheapo car ignition coil.
I wound it my self to make it small. Any coil can be used. My best is air core but what I use to charge battery is the small toroid one.

Quote:
Originally Posted by Godfrey View Post
Would it be better to short the HV output to the case rather than the negative terminal? I’ve noticed from continuity testing that they aren’t the same thing.
I don't know. I suggest to short the HV output for safety. The output should reduce a bit but see if you get it too.

Notice that you can only get radiant output with shorted secondary with stingo. On any other radiant circuit you must let the HV output open to get radiant output.

Quote:
Originally Posted by Godfrey View Post
So the cap is a DC filter? What load are you talking about? The charging battery?
Yes and yes.

Quote:
Originally Posted by Godfrey View Post
Isn’t the top of the human audible range around 20kHz?
Yes. Sometime I can not hear it's whine. Usually when charging an empty battery.



BTW, as charger, I prefer multiple stingo combined with my FWBR combiner than single stingo. Efficiency of combined circuit: 1 + 1 > 2.
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Last edited by sucahyo; 09-28-2010 at 06:54 AM.
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  #9  
Old 09-28-2010, 08:58 AM
7imix 7imix is offline
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Originally Posted by sucahyo View Post
All potentiometer change frequency. But each have different most efficient position that change with the load. If you have two amp meter, you can know the position on spesific load.
Where do the meters go? When the meters are in place, is the goal to maximize current?

Quote:
Originally Posted by sucahyo View Post

I wound it my self to make it small. Any coil can be used. My best is air core but what I use to charge battery is the small toroid one.
What is the diameter, how many turns, and what gauge wire for your best coil? I will make one. I wanted a smaller coil to make it easier to put in a project box.

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Old 09-28-2010, 05:25 PM
Ecoman11 Ecoman11 is offline
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@sucahyo

Have you tried to connect the negative of the battery to the positive of the source? Disconnect the negative on the FWBR and connect it to the positive of the power source. See if you get an increase, decrease or same current for both draw/input.

Ecoman
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Old 09-29-2010, 01:43 AM
7imix 7imix is offline
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If you are not watching this other thread yet, it's another stingo variant, and I made some progress reproducing it today, so check it out. There's a movie of some cool results.

Easy no BEMF motor with brushed motor

I also took some video of the stingo sparker and the stingo running with the high voltage side of the car coil shorted. It's uploading right now, I'll post a message when it's done processing.
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Old 09-29-2010, 02:00 AM
7imix 7imix is offline
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Ok, here is the first of a series of videos showing measurements of one of my stingos.

YouTube - Stingo Spark Gap Measurements

The frequency range I was able to measure is about 800hz to 5.5khz.

With the gap the spike is a lot dirtier, with a lot of bounce after the initial spike. I may not be getting a DC spark. Perhaps my magnetic quencher is in the wrong orientation, or the magnets are not close enough. I will experiment some more.

In the next video I perform measurements with the high voltage side shorted instead of a gap, and the spikes are much cleaner.
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Old 09-29-2010, 03:33 AM
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sucahyo sucahyo is offline
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Quote:
Originally Posted by 7imix View Post
Where do the meters go? When the meters are in place, is the goal to maximize current?
The goal is to maximize output current first, and then minimize the input current. But that is optional, you can also choose higher output instead of highest efficiency.




Quote:
Originally Posted by 7imix View Post
What is the diameter, how many turns, and what gauge wire for your best coil? I will make one. I wanted a smaller coil to make it easier to put in a project box.
For charger I use computer power supply toroid. As for the coil spec, I don't know, sorry:


Quote:
Originally Posted by Ecoman11 View Post
Have you tried to connect the negative of the battery to the positive of the source? Disconnect the negative on the FWBR and connect it to the positive of the power source. See if you get an increase, decrease or same current for both draw/input.
FWBR in series with cap is what I get after some experiment. You will get 40%. You can add another 20% with a trick but I am still not sure if it will be good for the battery.

Quote:
Originally Posted by 7imix View Post
With the gap the spike is a lot dirtier, with a lot of bounce after the initial spike. I may not be getting a DC spark. Perhaps my magnetic quencher is in the wrong orientation, or the magnets are not close enough. I will experiment some more.
Try with water surface too or increase the input voltage to 24V or something.

Thanks for the video . I really love the spike reading . Show sign of h wave too .

Can you show scope reading with shorted secondary and your hand toucing the PNP base?

I see delta T as 300uS, for small or big grid? that means the spike width is around 50uS or something?
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Old 09-29-2010, 04:17 AM
7imix 7imix is offline
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Quote:
Originally Posted by sucahyo View Post
The goal is to maximize output current first, and then minimize the input current. But that is optional, you can also choose higher output instead of highest efficiency.
thanks, I am looking forward to trying this.

Quote:
Originally Posted by sucahyo View Post
For charger I use computer power supply toroid. As for the coil spec, I don't know, sorry:
Ok, I will just wind a few coils and try them out. Thanks


Quote:
Originally Posted by sucahyo View Post
Thanks for the video . I really love the spike reading . Show sign of h wave too .

Can you show scope reading with shorted secondary and your hand toucing the PNP base?

I see delta T as 300uS, for small or big grid? that means the spike width is around 50uS or something?
You are welcome. What is an h wave?

Here is the second video I made today, of the secondary shorted. I will film touching the base tomorrow.

YouTube - Stingo with shorted secondary

At the top it says 50usec/div. Those are the grey squares on the screen. Delta t is the measurement between the two white dotted lines, which I can move to measure things. I will measure the spikes that way tomorrow.
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Old 09-29-2010, 06:36 AM
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Quote:
Originally Posted by 7imix View Post
You are welcome. What is an h wave?
h wave is a Bedini suggested wave form for charging a battery. A spike and some current after that.

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Originally Posted by 7imix View Post
Here is the second video I made today, of the secondary shorted. I will film touching the base tomorrow.

YouTube - Stingo with shorted secondary
Thanks. It do look noise free. I guess the secondary coil have some influence on the primary. I wonder if secondary noise is actually gain?

Quote:
Originally Posted by 7imix View Post
At the top it says 50usec/div. Those are the grey squares on the screen. Delta t is the measurement between the two white dotted lines, which I can move to measure things. I will measure the spikes that way tomorrow.
Thanks .
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Old 09-29-2010, 07:48 AM
7imix 7imix is offline
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I did some measurements on the spike duration. On my first coil with the secondary shorted and no load, the spike duration was 12usec. The highest voltage on the low voltage side was 29 volts as calculated by my meter, but it must be performing rms calculation on it because the scope is way off the charts on the spikes. The scope goes to 100 volts. The voltage fell off as i adjusted frequency to either side, so I figure that must be the resonant frequency of the coil. The frequency is 7.5khz.

On my other coil, I couldn't get it to oscillate with the secondary shorted. With the secondary open, the spike had a much gentler downslope and the spike duration was therefore 70us. The peak voltage was 45 volts and the resonant frequency was 1khz.
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Old 09-29-2010, 10:47 PM
SeaMonkey SeaMonkey is offline
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Quote:
Originally Posted by 7imix View Post
I did some measurements on the spike duration. On my first coil with the secondary shorted and no load, the spike duration was 12usec. The highest voltage on the low voltage side was 29 volts as calculated by my meter, but it must be performing rms calculation on it because the scope is way off the charts on the spikes. The scope goes to 100 volts. The voltage fell off as i adjusted frequency to either side, so I figure that must be the resonant frequency of the coil. The frequency is 7.5khz.

On my other coil, I couldn't get it to oscillate with the secondary shorted. With the secondary open, the spike had a much gentler downslope and the spike duration was therefore 70us. The peak voltage was 45 volts and the resonant frequency was 1khz.
Can you tell us how you were able to adjust
the frequency in order to find "resonance?"




The "Stingo" circuit is a very good example of how,
with a little creativity, a fairly simple and fun device
can be put together with commonly available parts.

If an automotive ignition coil isn't available then
virtually any transformer with a low voltage secondary
winding could be used in its place.

Not only is the "inductive kick-back" of the driven
winding useful; the high voltage produced in the
"secondary" may also be "tapped into."

Sucahyo has come up with a "stepping stone" to some
very interesting possibilities for the experimenter.
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Old 09-30-2010, 04:34 AM
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Quote:
Originally Posted by 7imix View Post
I did some measurements on the spike duration. On my first coil with the secondary shorted and no load, the spike duration was 12usec. The highest voltage on the low voltage side was 29 volts as calculated by my meter, but it must be performing rms calculation on it because the scope is way off the charts on the spikes. The scope goes to 100 volts. The voltage fell off as i adjusted frequency to either side, so I figure that must be the resonant frequency of the coil. The frequency is 7.5khz.
Thanks. I am not sure if it is resonance frequency of the coil, It maybe just the resonance of all component. Try it with load too.

Quote:
Originally Posted by 7imix View Post
On my other coil, I couldn't get it to oscillate with the secondary shorted. With the secondary open, the spike had a much gentler downslope and the spike duration was therefore 70us. The peak voltage was 45 volts and the resonant frequency was 1khz.
Thanks. You may need to try to replace the 100K resistor with potentiometer.

I found that different coil or load need different combination of all three resistance.
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Old 09-30-2010, 08:04 AM
7imix 7imix is offline
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Quote:
Originally Posted by SeaMonkey View Post
Can you tell us how you were able to adjust
the frequency in order to find "resonance?"
When the potentiometers in the stingo circuits are changed, the frequency of impulses going into the coil changes. In The borderlands video "transverse and longitudinal waves" Eric Dollard demonstrates how sending the output of an audio waveform generator through a power amp through a coil at certain frequencies causes it to reflect at a certain phase. When the phase of the reflection from the coil matches the phase of the audio output, the system is in resonance and the voltage is at it's maximum. When the frequency increases or decreases from this point the voltage drops.

Check out the Eric dollard videos if you haven't seen them, they are amazing.
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Old 09-30-2010, 08:09 AM
7imix 7imix is offline
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Thanks. I am not sure if it is resonance frequency of the coil, It maybe just the resonance of all component. Try it with load too.

Thanks. You may need to try to replace the 100K resistor with potentiometer.

I found that different coil or load need different combination of all three resistance.
Yes, its the resonance of all components. With load the frequency range available is different and the resonant frequency is different.

I'll try a pot.

Thanks!
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Old 10-01-2010, 03:14 AM
Godfrey Godfrey is offline
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Simplified test circuit?

Thanks for the nice videos, 7imix. Iím really psyched to see your oscilloscope work. My DSO Nano just arrived in the mail today. For the price, the sampling rate is very respectable. What HV probes are you using? Did you have to do anything tricky to adapt them to your Nano? I was able to see square wave output and measure frequency from a 555 timer circuit right away. I tried capturing wave output to Micro SD card, but was not able to get it to work. Have you had any luck with data storage? The documentation seems pretty sparse. Is there a good website for more information on it?

Iíve only got the 1x mini probes to work with so Iíve got to be careful measuring HV circuits.

Is it possible, Sucahyo, to remove the coil and isolate the oscillator part of the circuit for testing with 1x probes to see the square waves? Or is the coil necessary for oscillation to work?

- Godfrey
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Old 10-01-2010, 03:56 AM
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Yes, its the resonance of all components. With load the frequency range available is different and the resonant frequency is different.
I forgotto add. Try to change the 1K resistor with 100 ohm. hotter transistor but will force oscillation more.

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Is it possible, Sucahyo, to remove the coil and isolate the oscillator part of the circuit for testing with 1x probes to see the square waves? Or is the coil necessary for oscillation to work?
Yes, the coil is necessary. Can't you test it on PNP output?
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Old 10-01-2010, 06:47 AM
7imix 7imix is offline
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Quote:
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Thanks for the nice videos, 7imix. Iím really psyched to see your oscilloscope work. My DSO Nano just arrived in the mail today. For the price, the sampling rate is very respectable. What HV probes are you using? Did you have to do anything tricky to adapt them to your Nano?
You're welcome. Glad you like the DSO Nano. I like it a lot. We should get sucahyo one

I'm not actually using HV probes with the scope. I hook it up to the low voltage side. The spikes go way over it's range, but as long as the spike is nice and short I believe it won't hurt it. Mine is still working fine after using it a lot in this way.

i have a fluke HV probe. They have a 4000V one (100V divider) and a 40000V one (1000V divider). I have the 40000V one. It's just a voltage divider with a really big resistor in it. It wouldn't be too hard to make one assuming you can find a really huge resistor. Can probably find one in a microwave or buy one online. The voltage divider resistor goes to ground.

Quote:
Originally Posted by Godfrey View Post
I was able to see square wave output and measure frequency from a 555 timer circuit right away. I tried capturing wave output to Micro SD card to work but was not able to get it to work. Have you had any luck with data storage? The documentation seems pretty sparse. Is there a good website for more information on it?
You have to create files of the appropriate name on the SD card before you can save to those files. It's able to save to files, but not create them. Lame. Read the docs, it's in there.

Quote:
Originally Posted by Godfrey View Post
Iíve only got the 1x mini probes to work with so Iíve got to be careful measuring HV circuits.

Is it possible, Sucahyo, to remove the coil and isolate the oscillator part of the circuit for testing with 1x probes to see the square waves? Or is the coil necessary for oscillation to work?
The coil is what makes the whole thing oscillate... Try finding a brushed DC motor and making the motor stingo variant, the coil is a lot smaller and therefore so are the spikes.

But, don't worry, I've measured a lot of HV spikes with it and haven't had problems. As long as it's not DC or sine wave AC high voltage I'm guessing it will be fine.

Take some pictures and some video of your setup
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Old 10-01-2010, 06:49 AM
7imix 7imix is offline
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I forgotto add. Try to change the 1K resistor with 100 ohm. hotter transistor but will force oscillation more.
Cool, thanks. Weren't you suggesting I replace the fixed resistor with a potentiometer though?
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Old 10-01-2010, 07:41 AM
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Quote:
Originally Posted by 7imix View Post
Cool, thanks. Weren't you suggesting I replace the fixed resistor with a potentiometer though?
Two suggestion. Replacing 100K with potentiometer, and replacing 1K with 100 ohm.
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  #26  
Old 10-01-2010, 02:37 PM
7imix 7imix is offline
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Quote:
Originally Posted by sucahyo View Post
Two suggestion. Replacing 100K with potentiometer, and replacing 1K with 100 ohm.
Great, thanks for the clarification.
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  #27  
Old 10-02-2010, 10:49 PM
Godfrey Godfrey is offline
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3V test circuit wave forms

Quote:
Originally Posted by 7imix
You have to create files of the appropriate name on the SD card before you can save to those files. It's able to save to files, but not create them. Lame. Read the docs, it's in there.
My storage problems are more involved. I have a SanDisk 2G Micro SD card which Iíve tried formatting in both FAT16 and FAT32.
Iíve tried it with one full partition and divided into 2 partitions both under 1G. I created the blank files over and over.
The same thing happens. The Nano doesnít find the files and after Iíve put the SD card in once, it clobbers the format and
partition.

Quote:
Originally Posted by 7imix
Read the docs, it's in there.
In your docs, maybe. The manual I downloaded from the vendor is barely English. The Seeed manual doesnít help much because the interface is so different. I only found out about the file creation thing looking through Seeedís user forum.

I havenít yet updated my firmware s/w, but am having problems getting the USB drivers that are compatible with my laptop. I was wondering if the Seeed firmware would work on my DSO Nano clone. The site which had the firmware download makes it clear that itís only a demo. Any place you could direct me for further help, 7imix?

Quote:
Originally Posted by 7imix
Take some pictures and some video of your setup
Iíve got Stingo waveforms and a test bed to show. Iím stuck for the time being doing scope shots the old fashioned way with a camera. And I donít have a good digital video cam yet either.

Quote:
Originally Posted by 7imix
The coil is what makes the whole thing oscillate... Try finding a brushed DC motor and making the motor stingo variant, the coil is a lot smaller and therefore so are the spikes.
Good simplification idea. I didnít have any luck with the DC motors I could find around. I have computer fans and may give the last circuit Sucahyo posted in that thread a try later. For now, I was able to get a smaller transformer from a computer power supply working with 3V (2 AAA batteries). Here is a schematic showing an LED as the load:



My setup:



I got the circuit oscillating without any load at all and the secondary open. Without a load, shorting out the secondary completely kills the oscillation and shows a DC output. I havenít tried a regular load and closed secondary yet.

The lowest potentiometer setting produces a frequency above 2kHz. The wave is very noisy/ringy. The highest potentiometer setting gives a frequency of under 1kHz and the pulses are much sharper.

No load/open secondary scope results Ė knob left - lowest resistance/higher frequency:



Knob right - highest resistance /lower frequency:



It oscillates with an LED across the secondary. The LED lights dimly:



Greatest brightness fine-tuned 2/3 up the knob, oscillating at 1kHz:



When the LED is the regular load, it burns so brightly that it hurts to look at directly:



Greatest brightness fine-tuned within first 1/3 of knob, oscillating at 1.78kHz:



The point of the exercise was to have a scaled down and portable Stingo to look at with without heavy voltage or bulky coils involved. Iíve yet to do any current/load measurements but thought this was interesting.

- Godfrey
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Last edited by Godfrey; 10-03-2010 at 04:22 AM.
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  #28  
Old 10-03-2010, 11:57 AM
Godfrey Godfrey is offline
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Multi Stingo Circuit?

Quote:
Originally Posted by Sucahyo
BTW, as charger, I prefer multiple stingo combined with my FWBR combiner than single stingo
Keep meaning to ask you how that circuit would look. Are you just talking about two Stingos joined at the output to an FWBR? Or something more complicated?

If more complicated, do you have a schematic to show?

- Godfrey
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Old 10-04-2010, 04:12 AM
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sucahyo sucahyo is offline
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Thanks for the scope shot .

Quote:
Originally Posted by Godfrey View Post
For now, I was able to get a smaller transformer from a computer power supply working with 3V (2 AAA batteries). Here is a schematic showing an LED as the load:

Are you sure you don't put the LED backward? I think you should get brighter LED or even kill it if you reverse it. Mine reach 50V.


Quote:
Originally Posted by Godfrey View Post
Keep meaning to ask you how that circuit would look. Are you just talking about two Stingos joined at the output to an FWBR? Or something more complicated?
Complicated. Here is an example of combining two:


Three:



Ignore the circuit, just put attention to the wire after the coil going to charged battery.
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Old 10-04-2010, 05:35 AM
7imix 7imix is offline
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Quote:
Originally Posted by Godfrey View Post
My storage problems are more involved. I have a SanDisk 2G Micro SD card which Iíve tried formatting in both FAT16 and FAT32.
Iíve tried it with one full partition and divided into 2 partitions both under 1G. I created the blank files over and over.
The same thing happens. The Nano doesnít find the files and after Iíve put the SD card in once, it clobbers the format and
partition.


In your docs, maybe. The manual I downloaded from the vendor is barely English. The Seeed manual doesnít help much because the interface is so different. I only found out about the file creation thing looking through Seeedís user forum.

I havenít yet updated my firmware s/w, but am having problems getting the USB drivers that are compatible with my laptop. I was wondering if the Seeed firmware would work on my DSO Nano clone. The site which had the firmware download makes it clear that itís only a demo. Any place you could direct me for further help, 7imix?
I have firmware version 2.02. I haven't tried actually saving any waveforms yet, I'll try it and let you know if it worked.

What clone do you have?

Quote:
Originally Posted by Godfrey View Post
Iíve got Stingo waveforms and a test bed to show. Iím stuck for the time being doing scope shots the old fashioned way with a camera. And I donít have a good digital video cam yet either.



Good simplification idea. I didnít have any luck with the DC motors I could find around. I have computer fans and may give the last circuit Sucahyo posted in that thread a try later. For now, I was able to get a smaller transformer from a computer power supply working with 3V (2 AAA batteries). Here is a schematic showing an LED as the load:
Awesome, great shots, thanks.

Yeah you need to use brushed motors. Computer fans have a little board that actually generates ac to drive the motor. Try a cheap toy, like maybe some rc slot cars or something.

Thanks for the idea about using a smaller transformer. I played around with this a bit and enjoyed it a lot. I will do some more detailed measurements and report about them tomorrow.

I finished my fourth stingo build yesterday. I'll take some pictures and post them soon. It came out very nice and compact. I'm going to wind an air coil for it and see how high the frequency can go. I can't decide how to wind the coil yet... Bifilar pancake coil I think.
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