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Old 02-06-2010, 10:53 PM
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Arrow Mosfet Heating Circuits

Hi everyone,

This Open Source thread is for the advancement of a "Mosfet Heating Circuit" one that is a modified replication of one described in the Quantum October 2002 article.




The goal is to provide all possible updates and modifications to the existing "Revised 11-26-2009" circuit to find a higher "Coefficient of Performance" or COP using the latest circuit components, technology and equipment available for the advancement of this present circuit being used.

It will also given the time needed to document and fully evaluate previous testing and future testing on a submittal for possible publication in a accredited Journal or Magazine and Scribd the worlds largest on line publisher.

Please .... refrain from cutting and pasting this threads context to other "Energetic Forum" threads with questions or comments.

Best Regards,
Glen

Last edited by FuzzyTomCat : 10-13-2010 at 09:19 PM. Reason: Up-Dated
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Old 02-06-2010, 11:55 PM
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Mosfet Heating Circuit - Videos

Hi everyone,

I would like to also reference that at the "Open Source Research and Development" Channel there is a latest video library of available "LIVE" 5 Hour non stop recordings of various Oscilloscope wave forms, temperature readings and device shots of the modified Mosfet Heating Circuit available for your viewing pleasure.

Tektronix TDS 3054C
7 - Recordings or 33 Hours

Tektronix 2445A
1 - Recording of 5 Hours

Tektronix DPO 3054
1 - Recording of 5 Hours

*Highlights* on January 9, 2010, January 24, 2010 and January 31, 2010 with the preferred mode of operation shown.

Best Regards,
Glen
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Old 02-08-2010, 08:16 PM
Guruji Guruji is offline
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Heating circuit

Hi Fuzzy Aaron comes here? Cause I want to talk to him about his circuit of the one 12v battery that it's working.
Thanks
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Old 02-08-2010, 09:54 PM
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Quote:
Originally Posted by Guruji View Post
Hi Fuzzy Aaron comes here? Cause I want to talk to him about his circuit of the one 12v battery that it's working.
Thanks
Yes, he will and he is very much part of the group, glad to see you made it !

Best Regard's,
Glen
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Old 02-09-2010, 09:29 PM
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Hi All - and to the new thread

In this post I would like to address the concerns that most engineers and academics have regarding the mixture of energy from different power sources and the difficulty of keeping these separate during the data acquisition and recording. I have provided 3 different modifications to Glen's arrangement that provide a means of removing the secondary energy source from the circuit and will list the pros and cons of each modification.

First we have Mod A:
Here we have the simple addition of a readily available 7812 voltage regulator to allow the timer circuit to be powered by the 24V Supply directly. However, this modification requires a blocking diode to prevent the >90V inductive BEMF from damaging the regulator which is rated at 35V Max input.

Click This Link For Larger Image

MOD A Pros:
1. The CSR values represent 100% of the current flowing back to the battery including all Timer related current. Mesh Currents become a non-issue.
2. A more accurate battery power value is recorded as the BEMF is prevented from inflating this measurement
3. Scope probe positioning is retained from previous tests allowing similar adjustment protocols as previously used.
4. COP registrations will increase as all inductive energy is trapped between the blocking diode and the HEXFET forcing the energy to be dissipated in the Load (R3). [this feature requires sufficient time between retriggering to allow full transformation of the energy to heat]
5. Regulator only requires a 2.6V overhead - will work with total battery voltage as low as 14.6V - Good for endurance runs
6. No additional components needed to set regulator voltage.
7. Very large BEMF values on the blocking diode cathode can be withstood, up to 1000V

MOD A Cons:
1. The Batteries will not be recharged. The blocking diode forces that energy back to the Load (R3) to be dissipated.
2. Obtaining the Preferred Mode Of Oscillation will be more difficult because the voltmeter reference will always show a discharge commensurate to the actual total energy consumption.
3. The Linear regulator adds to the total energy consumption
4. Addition of the regulator requires involved modifications to the existing circuit

MOD A Conclusion:
Use this configuration for high COP accurate energy consumption tests.

==================================================

MOD B:

The Mod B configuration is very similar to Mod A, but uses a High Voltage TL783 Regulator that does not require the blocking diode. However, this regulator does require the addition of resistors to set the output voltage to the desired level.

Click This Link For Larger Image

MOD B Pros:
1. The CSR values represent 100% of the current flowing back to the battery including all Timer related current. Mesh Currents become a non-issue.
2. Scope probe positioning is retained from previous tests allowing similar adjustment protocols as previously used.
3. Source Battery is allowed to recharge
4. Obtaining the Preferred Mode Of Oscillation will be essentially unchanged from previous tests
5. Meter connections are retained with the same function as previous tests

MOD B Cons:
1. BEMF is allowed to inflate Voltage Source measurements giving a false indication of actual battery consumption.
2. BEMF energy at the battery is limited to 125V max
3. The Linear regulator adds to the total energy consumption
4. Extra resistors are needed to set the output voltage of the Regulator
5. COP values will be less than optimum as some of the BEMF energy is used to recharge the battery rather than heat the Load (R3).
6. The regulator has a high dropout voltage of over 21 volts - this limits endurance runs where recharging is unable to exceed or stall consumption.
7. Addition of the regulator requires involved modifications to the existing circuit

MOD B Conclusion:
Use this Mod where battery recharging is desirable along with retaining former equipment configurations.

================================================== =


MOD C:
This is really the most simplistic modification with regards to circuit changes. However, it necessitates a radical departure of the equipment connections and data acquisition. This is due to the fact that we are using a tapped supply source with two different voltage levels. Each must be properly monitored to accurately calculate the battery delivery power. This requires all four scope probes to be dedicated to obtaining the information required to calculate the total power delivered. Mesh currents are inherently addressed in either of the two branches for any instant in time.


Click This Link For Larger Image

MOD C Pros:
1. Very Simple modification, no new parts are required as the secondary CSR is already in place from a previous Mesh Current test.
2. Separate data collection for the timer circuit consumption and the Load circuit consumption.
3. No Regulator to add to the energy consumption
4. Battery Recharge is enabled
5. Meter connections are retained with the same function as previous tests.
6. There is no component limit to the BEMF other than HEXFET avalanche and battery plate arcing (which would be very bad - even explosive - maybe this should be a Con?).

MOD C Cons:
1. Major changes in Scope Probe connections and function. We lose the Gate reference and the Drain Pulse reference in our data acquisition.
2. Due to Con#1, obtaining the Preferred Mode Of Oscillation will be very problematic - a separate scope may be necessary to facilitate this function.
3. COP values will be less than optimum as energy is used to recharge the batteries.


MOD C Conclusion:
Use this mod where minimum circuit consumption is desired and a separate record of each branch is needed. A pre-calibrated circuit may be necessary prior to data acquisition. This arrangement would be good for very long endurance runs.


Cheers,

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Old 02-10-2010, 09:43 AM
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Test #1 through Test #16

Hi everyone,

Here is a listing of all my previous Tests #1 through #16 on the modified replication of the "Mosfet Heater Circuit" Energetic Forum links, with additional complete Tektronix Oscilloscope "Image and Data" files for each one.

TEST #1
Test #1
TDS 3054C Data and Image files - TEST #1

TEST #2
TEST #2
TDS 3054C Data and Image files - TEST #2

TEST #3
TEST #3
TDS 3054C Data and Image files - TEST #3

TEST #4
TEST #4
TDS 3054C Data and Image files - TEST #4

TEST #5
TEST #5
TDS 3054C Data and Image files - TEST #5

TEST #6
TEST #6
TDS 3054C Data and Image files - TEST #6

TEST #7
TEST #7
TDS 3054C Data and Image files - TEST #7

TEST #8
TEST #8
TDS 3054C Data and Image files - TEST #8

TEST #9
TEST #9
TDS 3054C Data and Image files - TEST #9

TEST #10
TEST #10
TDS 3054C Data and Image files - TEST #10

TEST #11
TEST #11
TDS 3054C Data and Image files - TEST #11

TEST #12
TEST #12
TDS 3054C Data and Image files - TEST #12

TEST #13
TEST #13
TDS 3054C Data and Image files - TEST #13

TEST #14
TEST #14
TDS 3054C Data and Image files - TEST #14

TEST #15
TEST #15
TDS 3054C Data and Image files - TEST #15

TEST #16
TEST #16
TDS 3054C Data and Image files - TEST #16


If any other information is needed on the previous tests that I may have or not listed please don't hesitate to ask ...

Best Regard's,
Glen

Last edited by FuzzyTomCat : 10-26-2010 at 03:56 AM. Reason: correct link
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Old 02-10-2010, 06:47 PM
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Testing Resistor Set

Hi everyone,

Here is the set of my prototype 10 Ohm "Borosilicate Glass Tube" ( Pyrex ) wire wound load resistors that has been made for testing and evaluation on the modified replication of the "Mosfet Heating Circuit", resistor specifications are -

Borosilicate Glass Tube
"Simax"
Code Number -246 320 280
O.D. - 32 mm (#1 and #2)
I.D. - 26.4 mm
Wall Thickness - 2.8 mm ( standard medium )
Length - 6 inches (#1) and 11 inches (#2)
http://www.pegasus-glass.com/2006_Si..._Catalogue.pdf ( page 6 )

Resistance Wire
AWG 20 [.032 dia] "Ni Cr" Type A - 80% nickel, 20% chromium (.6348 ohms ft.)
Spacing - 1mm (+ -)
Turns - 43 to 48 (maintain 10 Ohms, + - 5% maximum)

RTV Silicone
"Permatex"
Red High Temp RTV Silicone
Continuous Operating Temperatures F -65 to 600 (C -54 to 316)
Red High Temp RTV Silicone #81409





Picture from Left to Right

1) 32 mm diameter , coil length 3.375 inches , wire spacing gap 1 mm , uH - 20.41 ( calculated )
Complete Construction Details

2) 32 mm diameter , coil length 10 inches , wire spacing gap 4.762 mm ( approx ) , uH - 8.64 ( calculated )

3) 76 mm diameter , coil length 1.750 inches , wire spacing gap 1 mm , uH - xxx ( calculated )

Picture Center Front

4) 19 mm diameter , coil length 6.5 inches , uH - 18.81 ( calculated )
100 watt , Memcor # FR100 / 7931 "Off The Shelf Store Bought"


I hope this information is helpful in any replications experimenters may have.

Best Regards,
Glen

Last edited by FuzzyTomCat : 10-26-2010 at 03:57 AM. Reason: added information
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Old 02-10-2010, 07:11 PM
Guruji Guruji is offline
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Heater

Fuzzy which one you found best in efficiency and heating from those heating elements?
Thanks
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Old 02-10-2010, 07:22 PM
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Quote:
Originally Posted by Guruji View Post
Fuzzy which one you found best in efficiency and heating from those heating elements?
Thanks
Hi Guruji,

The one so far using what resistive wire listed is Number 1 for the best circuit efficiency. I will be in the future trying other types of resistive wire Ni Cr "Type B" and possibly some German silver type which I think Aaron is going to try also.

Best Regards,
Glen
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Old 02-11-2010, 04:54 AM
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Test #17

Hi everyone,

Here are the Images and Data from TEST #17 these were done with a Tektronix DPO 3054 Oscilloscope using there software called "Open Choice Desktop" with Visa.

This is a One (1) Hour test taking Image and Data readings every six (6) minutes using 40us and 2us divisions at 10K

Channel 1 - Mosfet Source to .25 Ohm Current Sensing Resistor
Channel 2 - Mosfet Drain Pin to 10 Ohm Load Resistor
Channel 3 - 555 Timer Pin #3
Channel 4 - 24 Volt DC Battery Bank



2us_001


2us_003


2us_005


2us_007


2us_009


2us_011


2us_013


2us_015


2us_017


2us_019


2us_021



Image and Data file Key w/ Temperature Readings




Original Test #17 Image and Data files - Zip Format


Best Regards,
Glen

Last edited by FuzzyTomCat : 04-18-2010 at 05:32 PM.
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Old 02-11-2010, 05:21 AM
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Test #18

Hi everyone,

Here are the Images and Data from TEST #18 these were done with a Tektronix DPO 3054 Oscilloscope using there software called "Open Choice Desktop" with Visa.

This is a One (1) Hour test taking Image and Data readings every six (6) minutes using 40us and 2us divisions at 10K

Channel 1 - Mosfet Source to .25 Ohm Current Sensing Resistor
Channel 2 - Mosfet Drain Pin to 10 Ohm Load Resistor
Channel 3 - 555 Timer Pin #3
Channel 4 - 24 Volt DC Battery Bank



2us_001


2us_003


2us_005


2us_007


2us_009


2us_011


2us_013


2us_015


2us_017


2us_019


2us_021




Image and Data file Key w/ Temperature Readings






100ns_023


800ns_025


400us_026




Original Test #18 Image and Data files - Zip Format


Best Regards,
Glen

Last edited by FuzzyTomCat : 04-18-2010 at 05:33 PM.
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Old 02-11-2010, 06:10 AM
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Test #19

Hi everyone,

Here are the Images and Data from TEST #19 these were done with a Tektronix DPO 3054 Oscilloscope using there software called "Open Choice Desktop" with Visa.

This is a One (1) Hour test taking Image and Data readings every six (6) minutes using 40us and 2us divisions at 10K

Channel 1 - Mosfet Source to .25 Ohm Current Sensing Resistor
Channel 2 - Mosfet Drain Pin to 10 Ohm Load Resistor
Channel 3 - 555 Timer Pin #3
Channel 4 - 24 Volt DC Battery Bank



2us_001


2us_003


2us_005


2us_007


2us_009


2us_011


2us_013


2us_015


2us_017


2us_019


2us_021




Image and Data file Key w/ Temperature Readings





100ns_023


800ns_025


400us_026




Original Test #19 Image and Data files - Zip Format


Best Regards,
Glen

Last edited by FuzzyTomCat : 04-18-2010 at 05:35 PM.
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Old 02-11-2010, 06:55 AM
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Test #20

Hi everyone,

Here are the Images and Data from TEST #20 these were done with a Tektronix DPO 3054 Oscilloscope using there software called "Open Choice Desktop" with Visa.

This is a One (1) Hour test taking Image and Data readings every six (6) minutes using 40us and 2us divisions at 10K

Channel 1 - Mosfet Source to .25 Ohm Current Sensing Resistor
Channel 2 - Mosfet Drain Pin to 10 Ohm Load Resistor
Channel 3 - 555 Timer Pin #3
Channel 4 - 24 Volt DC Battery Bank



2us_001


2us_003


2us_005


2us_007


2us_009


2us_011


2us_013


2us_015


2us_017


2us_019


2us_021




Image and Data file Key w/ Temperature Readings




100ns_023


400ns_025


800ns_025





Original Test #20 Image and Data files - Zip Format


Best Regards,
Glen

Last edited by FuzzyTomCat : 04-18-2010 at 05:36 PM.
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Old 02-11-2010, 07:49 AM
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Test #21

Hi everyone,

Here are the Images and Data from TEST #21 these were done with a Tektronix DPO 3054 Oscilloscope using there software called "Open Choice Desktop" with Visa.

This is a One (1) Hour test taking Image and Data readings every six (6) minutes using 40us and 2us divisions at 100K

Channel 1 - Mosfet Source to .25 Ohm Current Sensing Resistor
Channel 2 - Mosfet Drain Pin to 10 Ohm Load Resistor
Channel 3 - 555 Timer Pin #3
Channel 4 - 24 Volt DC Battery Bank



2us_001


2us_003


2us_005


2us_007


2us_009


2us_011


2us_013


2us_015


2us_017


2us_019


2us_021



Image and Data file Key w/ Temperature Readings





100ns_022


400ns_024


1us_025




Original Test #21 Image and Data files - Zip Format


Best Regards,
Glen

Last edited by FuzzyTomCat : 04-18-2010 at 05:40 PM.
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Old 02-11-2010, 08:27 AM
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Test #22

Hi everyone,

Here are the Images and Data from TEST #22 these were done with a Tektronix DPO 3054 Oscilloscope using there software called "Open Choice Desktop" with Visa.

This is a One (1) Hour test taking Image and Data readings every six (6) minutes using 40us and 2us divisions at 100K


Channel 1 - Mosfet Source to .25 Ohm Current Sensing Resistor
Channel 2 - Mosfet Drain Pin to 10 Ohm Load Resistor
Channel 3 - 555 Timer Pin #3
Channel 4 - 24 Volt DC Battery Bank



2us_001


2us_003


2us_005


2us_007


2us_009


2us_011


2us_013


2us_015


2us_017


2us_019


2us_021




Image and Data file Key w/ Temperature Readings






100ns_022


1us_025


4ms_030




Original Test #22 Image and Data files - Zip Format


Best Regards,
Glen

Last edited by FuzzyTomCat : 04-18-2010 at 05:42 PM.
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Old 02-11-2010, 08:35 PM
Guruji Guruji is offline
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Negative waveform generator

Hi Fuzzy did you try to build the negative waveform generator circuit by Aaron?
It's with one 12v battery. The thing is that he says that there was no heat in his resistor while when I replicated it ;mine is got heated.
It's consuming around 12w true but it's efficient to conventional elements.
If someone replicate this circuit I am looking forward to discuss with him.
Thanks
Andrew
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Old 02-11-2010, 09:34 PM
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Negative Dominate Wave Form - Replication

Quote:
Originally Posted by Guruji View Post
Hi Fuzzy did you try to build the negative waveform generator circuit by Aaron?
It's with one 12v battery. The thing is that he says that there was no heat in his resistor while when I replicated it ;mine is got heated.
It's consuming around 12w true but it's efficient to conventional elements.
If someone replicate this circuit I am looking forward to discuss with him.
Thanks
Andrew
Hi Andrew,

Yep ... I have tried and documented here at Energetic Forum Aaron's "Negative Dominate Wave" form generator circuit and here are the links ...

Post #2606 (Tektronix 2445A Scope)

Post #2764 (Tektronix TDS 3054C Scope - Part 1)

Post #2766 (Tektronix TDS 3054C Scope - Part 2)

Aaron's "Negative Dominate Wave" form generator schematic is totally different from the "Mosfet Heating" circuit and the #2606 posting was my attempt using my Scope.

The other two postings #2764 and #2766 was on a Tektronix TDS 3054C that was available for my use at Aaron's residence for a time and he was able to fine tune my replication, being he was much more familiar with the circuit and the Scope being used ..... he has much more time and effort in this circuit than anyone I know.

Hope this helps ...

Best Regards,
Glen
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  #18 (permalink)  
Old 02-12-2010, 11:48 AM
Guruji Guruji is offline
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Heater

Fuzzy thanks for your help. My pots are adjusted like this :
1K pot=24ohms
5kpot=412ohms
2kpot=955ohms
10kpot2.88Kohms
Another thing I used 1n4148 diodes instead of 1n914.
Thanks
Andrew
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Old 02-14-2010, 04:03 AM
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Quote:
Originally Posted by Guruji View Post
Fuzzy thanks for your help. My pots are adjusted like this :
1K pot=24ohms
5kpot=412ohms
2kpot=955ohms
10kpot2.88Kohms
Another thing I used 1n4148 diodes instead of 1n914.
Thanks
Andrew
Hi Guruji,

The DMM Ohm reading is this taking in consideration for the resistance of the test leads ? My DMM's vary from .2 to .4 ohms that needs to be deducted from the resistance measured, if you know this cool, but maybe some other members or guests may not be aware of this fact.

Best Regards,
Glen
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Old 02-15-2010, 01:01 AM
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Tektronix "Open Choice Desktop" Software

Hi everyone,

The Images and test data from Test #17 through Test #22 was acquired using a Tektronix DPO 3054 Oscilloscope and downloaded with software supplied free by Tektronix called "Open Choice Desktop" with Visa directly to you computer via a USB cable from a 2.0 compliant port.

Using this software for data analysis is "great" the type .csv file used the data actually includes a exact color copy of the wave form image the data came from just by opening the .csv file up using the "Open Choice Desktop" with Visa software. It's quite a large software file about 117 MB but the image data is incredible and a extremely useful addition.


OPENCHOICE DESKTOP APPLICATION TDSPCS1 v1.8
OPENCHOICE DESKTOP APPLICATION TDSPCS1 v1.8 > Software Downloads : Tektronix

COMPUTER REQUIREMENTS
PC equipped with Windows 2000, XP PRO or Vista 800+ MHz, 500MB RAM, HD, Mouse, Keyboard. Connected by GPIB, USB, RS232 or LAN to a compatible Tektronix oscilloscope. VISA (Virtual Instrument Software Architecture) must be installed on the PC for OpenChoice Desktop to work collecting actual data from a compatible Tektronix oscilloscope. Please read the Instructions on this web page to get an appropriate version of VISA for data collection.

Best Regards,
Glen
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  #21 (permalink)  
Old 02-19-2010, 09:02 AM
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ashtweth ashtweth is offline
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Course updated (Feb 19, 2010):
http://www.panaceauniversity.org/Ros...chnology.p df

H, Glen, let me know if any tweaks needed.

Ash
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  #22 (permalink)  
Old 02-20-2010, 11:35 AM
Guruji Guruji is offline
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water heater

Hi guys did anyone try this circuit to a water heater? I tried mine with a little nichrome wire rapped to the brass tube under the water heater but no results cause there has to be a flow or the heater should be immersed in water. Anyone tried this?
Thanks
Thanks
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Old 02-22-2010, 03:16 AM
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ashtweth ashtweth is offline
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Hi Guruji thanks for the report how did you tune your circuit?, Did you use a scope and get the harmonic and wave form? we could with a 100mhzh scope but not keep it there, still need better equipment to fine tune.

Fuzz, H and many others including for a change Rose LOL have made some helpful hints on this in the communities PDF
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Old 02-22-2010, 11:15 AM
Guruji Guruji is offline
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Quote:
Originally Posted by ashtweth View Post
Hi Guruji thanks for the report how did you tune your circuit?, Did you use a scope and get the harmonic and wave form? we could with a 100mhzh scope but not keep it there, still need better equipment to fine tune.

Fuzz, H and many others including for a change Rose LOL have made some helpful hints on this in the communities PDF
Hi Ashweth I don't have a scope it was with patience about tuning. I adjust the pots with my hand on the resistor. When I feel a little heat coming then I take note of the resistors. Then I try to adjust a little more for more heat.
Now I am trying to find resonce on a water heater filament maybe I will find resonance on this too. I can say that it happened at one moment but I was'nt that aware and lost the settings.
I'm still trying on this.
Thanks
Andrew
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Old 02-27-2010, 05:11 AM
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Harvey Harvey is offline
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Temperature Profile

Hi All,

I have finally completed all of the Master Files for Tests 17 - 22 and uploaded them to the repository for team access. It is my wish that these files be made available to everyone so that careful analysis can be done on them. The two large databases for Test 21 and 22 are over 250MB due to the data sample resolution of 10 times that of previous tests. But I have zipped them into RAR format of about 35MB for those with Microsoft Access that would like to have a copy of the program I wrote for those analyses. I am open to suggestions for a convenient means to make those available to everyone.

Here is a quick link to the original Temperature Profile which you will want to use when evaluating that data:

Glens Post With Original Temperature Profile

Please note the difference between Ambient and the Resistor Temp in these readings as this is important when evaluating the proper power reading associated with a given temperature in the various tests.

There is a lot of data here and I am still working out what it all means, but there are a couple of things that stand out in these tests that we missed in the earlier tests.

First of all, we did not do power graphs in the previous tests. If we had, we may have seen the gradual ( > 400 us ) drift of the power center-line above and below the voltage source reference.

Secondly, the 100,000 sample data reveals transients that are simply left out of the smaller resolution data. Some of these transients are significant as they directly impact the power averages.

Another thing that really pops out in these tests is the AC current. This can be very problematic when trying to use Rosemary's method of analysis which presumes that all negative current is to be subtracted from the DC supply consumption. I hope to address this concern in greater depth in later posts here, but the simple issue is that AC current on the CSR will net to zero using her method even when real power is dissipated in the load. We need a definitive way to separate the AC power from the DC power in the analysis.

Hopefully I can do a short video on some of these points within the next week.

Cheers,

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Old 02-27-2010, 11:28 PM
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Determining The Inductance of Our Resistors

Hi All,

In this post I would like to address as concisely as possible the subject that has been asked, alluded to, mildly discussed and never actually answered.

How can we accurately determine the inductance of our DIY resistors?

It may seem on the surface that a premium LCR meter would suffice, but we would always question whether this would accurately separate the resistance from the inductance since these are both integrated into the same device. Also, what of us who do not have an LCR meter?

With a couple of formulas, an AC Ammeter and an AC signal generator the matter can be handled.

I will not be going into all of the deep technical aspects of the imaginary parts of complex numbers and how they play into this but I will be converting from the polar coordinate values given by our Ammeter and the rectangular coordinate system used to extract the inductance. You can refer here for more information: Series resistor-inductor circuits : REACTANCE AND IMPEDANCE -- INDUCTIVE

There are two formulas to consider:

1. XL = 2πfL which is also expressed as L = XL / 2πf
2. |Z| = √(X
L + R)

You may recognize the second formula as the Pythagorean Theorem. This is because the absolute impedance is the vector described by a 0 phase shift in the Resistor and the 90 phase shift in the inductor. Visually, you would see one vector running horizontal, the other vertical and the result is the hypotenuse of the two.

Let's use Glen's resistor as the device under consideration. His resistor has a DC resistance of 10 Ohms, this is our R value.

For the test we will need a Function Generator able to produce a 10V AC sine wave with at least 1A capable of being tuned to 79.5 kHz
. I have chosen those values only because they make this example easier to follow.

Step 1:
We place the AC Ammeter in series with the resistor and run the 79.5 kHz sine wave signal through it. I would expect to see a current of about 0.707A (seven hundred seven milliamps). With this information we can now determine the inductance of the resistor.

Step 2:
|Z| = 10 volts over 707 milliamps or 14.144 Ohms. Now this is a complex number, a vector - we cannot simply subtract 10 ohms to find our
XL portion of the absolute impedance |Z|. We must apply Formula 2. Therefore we get XL = 14.144 - R or simply, the inductive reactance squared equals the total impedance squared minus the resistor value squared orXL = 14.144 - 10. This becomes 100 = 200 - 100 (simple eh?) So, XL = √100 which is 10.

Step 3:
Now that we know the inductive reactance, we can use Formula 1 to get the inductance of the resistor. This is simply Ten divided by (two times Pi times 79500) which is
XL / 2πf where f is frequency in Hertz. The result will be in Henries. To convert it to H simply divide it by 10^-6.

So what do you calculate the result to be? Well, this exercise is purely hypothetical, Glen would have to perform the test and tell us what he really gets. But if his current was 707mA as shown here, then the resistor would have an inductance of about 20H.



Last edited by Harvey : 02-27-2010 at 11:40 PM.
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  #27 (permalink)  
Old 03-01-2010, 03:17 AM
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ashtweth ashtweth is offline
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Harvey it hurts my head to think how smart you are.
Thanks a lot for posting man.
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Old 03-01-2010, 03:55 AM
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Thanx for the complement Ash , but really all I did there was apply some general knowledge already on the net to our specific needs. The real credit goes to those great minds like Oliver Heaviside that brought it all into perspective for us.
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Old 03-02-2010, 07:31 PM
Guruji Guruji is offline
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44ohm filament

Hi guys anyone with a scope and try a water heater filament with a Negative form generator circuit of Murakami with one 12v battery please?
I really want to see if this filament would heat up.
Thanks
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Old 03-04-2010, 06:23 PM
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Quote:
Originally Posted by Guruji View Post
Hi guys anyone with a scope and try a water heater filament with a Negative form generator circuit of Murakami with one 12v battery please?
I really want to see if this filament would heat up.
Thanks
Hi,

Just wanted to add some information on the International Rectifier - IRFPG50 HEXFET Power MOSFET (w/ Sil-Pad insulator between Mosfet and Heat Sink), is that although it's rated at 1000 Volts it does have a 6.1 Amp limitation ...

Best Regards,
Glen
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