Joule Thief 101

[AlienGrey]

Have a look at this one, once it's started i doesn't need a battery, see if you can copy it !

https://www.youtube.com/watch?v=GmlpV1MWm40

[Pirate88179]

Have a look at this one, once it's started i doesn't need a battery, see if you can copy it !

https://www.youtube.com/watch?v=GmlpV1MWm40

I think the battery is in the hollowed out ceramic resistor and he uses the pizo clicking sound to mask the sound of his flipping the ON switch from his hidden battery that just happens to go out of camera view when it is switched on.

That is my take...any others?

Bill

[AlienGrey]

the device has a coil going through the mine toroid coil you dont think it could  be 1/4 wave ie 4 x f then ? he does say the device is a mos fet and not a juction tranie.

[Pirate88179]

the device has a coil going through the mine toroid coil you dont think it could  be 1/4 wave ie 4 x f then ? he does say the device is a mos fet and not a juction tranie.

I don't know, I am just guessing and that was my opinion as I mentioned.  I just do not think that that device runs itself.  I mean, I had a large ballast resistor on my 440 magnum 1970 high performance engine.  Why would you need such a huge resistor on a little board like that with those other dinky components?

Bill

[MileHigh]

Brad:

You do understand that a JT circuit is meant to operate at very low voltages?. I mean,that is what the JT is all about--taking the last bit of energy from an almost dead battery. Why are you talking about standard switchmode operation,when we are all talking about how the circuit operates at the low voltages we want them to run at.

This is just another bait and switch.  You have probably tried to pull off about 20 bait and switches in this thread so far and every time you do that you compromise your integrity.  When is it going to stop?

Post 316-Quote: You mentioned stuff about transistor junction capacitance and "RLC."
Of course you cant,as you refuse to accept that the circuit !is! an RLC circuit. As long as you continue to exclude the C in RLC,then you will never understand as to how !your! JT circuit can run on voltages well below that of the threshold voltage required to switch on the transistor.

Take another look at Mag's scope shot that has you confused. What is the threshold voltage required by the transistor Mag's is using to switch on?. If the supply voltage to the JT is 320mV,then how come we see a higher voltage during the on time portion in the scope shot?.

This is just another "play" which also compromises your integrity.

Dont panic MH,i am putting together all the information you required from me on the workings of a JT !!at low voltages!

Don't do yet another bait and switch.  Do what you are supposed to do, explain how a standard Joule Thief circuit works.  If you want to go beyond that and describe more stuff then fine, but start by describing how a standard Joule Thief circuit works.

MileHigh