hondabones

modified 3 years ago

Joule Thief

434

14:15:55

Self oscillating voltage booster

published 6 years ago

kiani

6 years ago

Check the link, readjusted your circuit, and it works now..

kiani

6 years ago

http://everycircuit.com/circuit/5831695895625728

hurz

6 years ago

with some work it can be a nice demo circuit http://everycircuit.com/circuit/6707958076145664

kiani

6 years ago

This is much better, we don't need an expensive fm LED battery saver...

hurz

6 years ago

whats a "fm LED battery saver"?

kiani

6 years ago

I ment a 50 to 100 MHz. Fm Oscillator.

hurz

6 years ago

sorry i dont get it

kiani

6 years ago

Just mixed thoughts in a cooking pot. A variable frequency power supply. Modulating dc optput voltage!? control loop that varies the frequency for regulation rather than pulse width... Increased efficiency as more power is used...pre_ idea thoughts. ( bullshit!!?)

hondabones

6 years ago

Thanks everyone. I adjusted it but can't get the LED voltage right. It's almost there. When I raise it the circuit increases voltage across it? What determines the output voltage?

kiani

6 years ago

Thr other way arround, it is the led that limits the osc. Voltage.

hondabones

6 years ago

But if I change the led to a higher voltage, it still burns in the simulation. There has to be away to fix that and it isn't the led.

hurz

6 years ago

sure, the amount of energy in a joule thief is mainly limited by the base resistance, which is also by the same mechanism resposible for the running frequency. Higher resistor higher frequ. but less current per periode if oacillation. This resistor together with the transistor can explain to total joule thief, why it works and how. So increase the resistor and your LED gets less current

hurz

6 years ago

BTW, protecting a 3.2V LED with a 3.2V zener is a typical noob mistake, that wont work at all

hondabones

6 years ago

I'm a noob? Check yourself. I'm not protecting the LED. I'm regulating the voltage because the simulation won't do what I want. It isn't actually needed in the real world.

hondabones

6 years ago

@kiani I apologize, it is the LED that sets the output voltage. Thanks.

kiani

6 years ago

Just check your transformer inductance, that iscset to 20 H (EC set), that needs to be adjusted realistically, something like 20 mH or less,.. Also you can just be able to put the LED directly to the oscillator.. Check the links in the posts,,, in Hurz circuit check the transformer inductance...

hurz

6 years ago

primary 10H while secondary 5.625H noob settings

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