Stingo Solid State Battery Charger

[7imix]

Here's my 4th stingo build. It came out very nice and compact. I am using NTE392 and NTE393 transistors. On the right are the 500k and 10k pots. The 10k pot I used on this one is a very nice 10 turn pot. This makes fine tuning very nice. On the left are 2 pots for changing the voltage divider. I accidentally put a 8.8k pot instead of a 100k pot, so instead of tearing the thing apart to remove it I simply added the 100k pot in series with the 8.8k. This means I have a rough and fine adjustment on the voltage divider leg, which is nice.

The positive and negative battery connections are the wires sticking out of the left side, and the connections for the coil and the radiant recovery are on the right side.



This setup is pretty hard to tune since there are so many knobs, but once it is oscillating the tuning is very sensitive, which is nice.

Here's a side view showing the transistors under the board which is supporting all the pots.

[7imix]

Thanks for the information about the dso. I think I will have to figure out how to upgrade the firmware and install some third party software. I am also a programmer so I have fantasizes about how I want to change the ui. Hooray for open source!

I have a 2gb card too. I guess I should get a smaller one.

That is what I am interested in seeing. The bemf is not as interesting to me as driving the sharp sloped spikes into a tesla transformer with a termination. (probably a dead light bulb) Since the bifilar coil reduces back emf through self induction (I am assuming...) this setup should produce maximum dielectric induction, or displacement current. That is what I am most interested in researching.

[Godfrey]

DSO Nano Oscilloscope Issues

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?

General Eletronics-TechSeeedstudio Forum • View forum - DSO nanodsonano - Project Hosting on Google Code

The original manufacturers of the STM32 maintain development docs for the ultra technically inclined:

STM32 (ARM Cortex M3) - 32-bit Microcontrollers - Technical Literature and Support Files

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.

Looking forward to it!

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.

[Godfrey]

To 555 or not to 555 - that is the question.

I felt compelled to take it out of our private conversation and chew on this fat here for everybody to enjoy.

With 555 timer, it work better than normal 555 based one.

I always switch with a transistor or MOSFET You can actually see the 2N3055 sitting on my breadboard that I use with NE555's. It's slow enough to keep them alive.

But since it is so efficient, you might kill the 555 easily when playing with the circuit.

I would use a CMOS 555. Wouldn't that keep up with it?

Any 555 can be killed easily on radiant circuit because of its spike. I prefer stingo because it is more reliable.

I don't see any reason to use 555.

Show me a Stingo circuit that provides precise, dynamic control of frequency and pulse width and I'll agree with you.

- Godfrey

[Godfrey]

LED Heresy

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

Complicated. Here is an example of combining two:

I like the two Stingos feeding one coil Looks good for a MOT.

Ignore the circuit, just put attention to the wire after the coil going to charged battery.

[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?

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.

[sucahyo]

Thanks for the scope shot .

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.

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.

[Godfrey]

Multi Stingo Circuit?

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

[Godfrey]

3V test circuit wave forms

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.

Read the docs, it's in there.

Take some pictures and some video of your setup

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.

My setup:



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:

[7imix]

Two suggestion. Replacing 100K with potentiometer, and replacing 1K with 100 ohm.

Great, thanks for the clarification.

[sucahyo]

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.

[7imix]

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?

[7imix]

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.

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.

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

[sucahyo]

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.

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?

[Godfrey]