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Overunity Machines Forum



Joule Thief 101

Started by resonanceman, November 22, 2009, 10:18:06 PM

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picowatt

#1385
April 02, 2016, 11:26:00 PM
Quote from: TinselKoala on April 02, 2016, 10:56:02 PM
How about them apples:

When I replace the 3 x 1n4007 diodes with 3 x 1n4148 diodes, and have the 1k resistor across the LED, the LED does _not_ light.

Now if I replace the 1k resistor with the 2.2 uH inductor the LED _does_ light (rather dimly). And as I increase the frequency from 10 kHz, the LED gets brighter and brighter, until brightness peaks at around 1.2 MHz and then begins to decrease.

With just the resistor, or nothing, across the LED, the LED stays off as I increase frequency from 10 kHz.

:P

The 4148 switching diodes turn off much faster than the 4007's.

When using the inductor, the AC impedance across the LED is increased and there is less reverse current during the high frequencies of the rising edge to turn off the diodes, so there is likely a very narrow current spike that makes it thru as they turn off...

PW

Magluvin

#1386
April 02, 2016, 11:48:33 PM
Quote from: tinman on April 02, 2016, 10:51:35 PM
What polarity is the LED in relation to the battery Mag's ?.

At 15 mhz,and being a new battery,i would think the LED is lit due to skin effect.


Brad

Its the cathode to the - of the battery.

Mags

picowatt

#1387
April 03, 2016, 12:08:40 AM
Quote from: Magluvin on April 02, 2016, 08:30:03 PM
Anyway....

Was looking into the battery oscillation more.  With the new circuit a relatively fresh AA battery is ringing at about 15mhz. The voltage swings seem quite high, so I put a white led across the battery. Circuit is running without load leds. Only the led across the battery.

Mags

You have a significant amount of inductance in your battery lead wires...

What does the waveform look like if you scope directly across the battery?

PW

SeaMonkey

#1388
April 03, 2016, 01:00:59 AM
Quote from: PicoWatt
...With 22 cents a gallon gasoline, nobody cared.

In today's money that 22 cents becomes $4.40 -
many of us cared.

SeaMonkey

#1389
April 03, 2016, 01:18:09 AM
Quote from: TinKoa
Now if I replace the 1k resistor with the 2.2 uH inductor the LED _does_ light (rather dimly). And as I increase the frequency from 10 kHz, the LED gets brighter and brighter, until brightness peaks at around 1.2 MHz and then begins to decrease.

Seems you've constructed some sort of "resonant"
circuit there TK.  Evaluating this performance to
arrive at an explanation should be a most beneficial
exercise.  So far, well done!
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