Dear Prof. Jones,
I believe you must have observed changes in waveforms when you use capacitors instead of batteries.
The trick with the Joule Thief or FLEET type devices is to hunt for the best “resonance” condition. I put “resonance” in quotes because I am not too sure that we can use the standard resonance concepts in such devices. A few individuals or teams trained by me told me that they had achieved “resonance conditions” that can be commercially exploited. One is the LED hat from Taiwan. The NEW hat will light up more LEDs for much longer periods.
I can tune the FLEET prototypes so that the Average Positive Output Power is greater than 15 watts. I may be able to use heater elements to heat small amounts of water and recharge batteries at the same time.
Lawrence: I am suggesting that you replace the input batteries with a large-C capacitor of approximately the SAME voltage. Depending on how long you run with the capacitor each time and how large C is, the voltage may not drop excessively. Then look at the waveforms, and I suspect these will not change so much; actual measurements will tell. The attached photo shows large caps on my electronics bench today (two of are involved in tests currently). There are two 10,000 mFd (300VDC) red caps, the blue one is 60,000mFd (25VDC), and there are two 2,600 Farad (that is correct) caps rated for 2.5 V. I believe you will find that using a large-C cap like this may not change your waveforms so much compared to a battery, as long as you operate at nearly the same voltage as you had previously on the battery. Would you try it? It should not be difficult to make the substitution and observe the waverforms. Regarding the output, you note: I can tune the FLEET prototypes so that the Average Positive Output Power is greater than 15 watts. I may be able to use heater elements to heat small amounts of water and recharge batteries at the same time. 15 watts output (average +) is impressive and certainly should allow you to "use heater elements to heat small amounts of water". Then you can easily calculate Q (heat) -- I gave the equation in my previous post. I would suggest that you dissipate as much of the output power as possible in the output heater elements, so as to see whether indeed you are achieving ou. Yes, you may have to change the "tuning" -- but the reward for this effort is that you will FINALLY be able to see what is happening with reliable and credible measurements regarding the input and output energies (and power). And finally able to convince others! IMO. Continued oscilloscope measurements are not likely to convince most researchers on these FE forums - for reasons we have explored before, but in addition you yourself admit some questions from DSO readings: There is still something I do not understand. Sometimes I can get the Average Negative Output Power to be greater than the Average Positive Output Power. That implies that the Output (with load) circuit is NOT drawing energy from the Joule Thief Primary. It may even be supplying energy back to the Primary. -- Lawrence
May I suggest that using calorimetry as described, along with a large C cap for input energy, will enable you to FINALLY convince others (and perhaps yourself) regarding what is happening (one way or the other) in your circuit, which you have been working on for years.
My best wishes for your efforts.
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