LED Capacitor Issue?

Ok, so i have a non alterable power source of about .75 volts. I need it to power a 1.8v red led. I don't want to use the joule thief to accomplish this....so...Can I hook up a capacitor to store energy, then transfer it to the led? or how can i get the led to fully illuminate? THANKS!!

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westfw10 years ago
You can try this one. Somewhat more complex than the Joule Thief (TWO transistors!), but uses standard components and no home-made transformers.
westfw10 years ago
There are some other circuits similar to the "joule thief", at least conceptually. Why is it that you don't like the JT?
Joe426 (author)  westfw10 years ago
I couldn't get the stupid thing to work! :(
Joe426 (author)  Joe42610 years ago
may be because i have a wrong ferrite, i just found one on an old Mobo, and used it.
guyfrom7up10 years ago
Joule theifs are great, but I could never really get them to work. is it ac or dc? If AC you could use a voltage doubler or tripler cicuit. If DC then I don't know of a simple way without more complicated cicuits
Joe426 (author)  guyfrom7up10 years ago
It's DC