Is joule thief circuit gets overunity?

[MileHigh]

Poynt:

Indeed, I hadn't thought about the narrowest parts of the spikes not being too significant for the overall power calculation. 

I guess you can call yourself an "old timer" when you look at one of these new scopes, and to your surprise there is very little front-to-back depth to them.  I don't know if that's the case with your high-end model.  We are so used to scopes being heavy and and at least 14 or 15 inches in depth.

They feel "chopped off" to me!  What happened?  lol

MileHigh

[ltseung888]

The Output scope shots:

tek006 through tek008 illustrate how the Output Voltage and Current wave forms vary as the Input Voltage is varied from 0.53V to 1.35V.

Not taking into account the drops in the CSR resistors, a rough COP can be calculated by dividing the average Output Power by the average Input Power for a corresponding Input Voltage.

Input Voltage (0.515V, and 0.53V)
Pout = 3.68mW
Pin = 5.66mW
COP = 0.65

Input Voltage (1.35V)
Pout = 39.8mW
Pin = 48.4mW
COP = 0.82

Short video of the Input Voltage sweep to follow...

@poynt99,

Can you please take shots from the lowest Vin that lights the LED - even dimly?  Thank you.

[picowatt]

.99,

I just read a portion of your new scopes manual.  It looks like it has an 8 bit native resolution at full bandwidth/max sweep rates, and can do 11bits in hi res mode at lower sweep rates.


PW

[poynt99]

A quick sweep of the input voltage and the resulting current trace.

Lawrence to answer your request, you can see in the video what the wave forms look like when the circuit just begins oscillating.

http://www.youtube.com/watch?v=T-E7W8HGucg

[ltseung888]

A quick sweep of the input voltage and the resulting current trace.

Lawrence to answer your request, you can see in the video what the wave forms look like when the circuit just begins oscillating.

http://www.youtube.com/watch?v=T-E7W8HGucg

@poynt99,

I can see a USB in the video.  Can you capture the raw data in that USB?