751Views5Replies

Author Options:

Joule Thief Speaker Amp? Answered

If a joule thief circuit can be used to amplify a battery to power an LED, could it possibly be used to amplify a speaker instead of a LM306? chip?

5 Replies

user
acmefixer (author)2010-12-11

An amplifier is a different kind of circuit. You can use the transistor from a JT along with a few others and a few parts to make a simple amplifier. Here is a three transistor amplifier for driving a small speaker.
You can see many other interesting circuits at Bowden's Hobby Circuits. Have fun!

Select as Best AnswerUndo Best Answer

user
Re-design (author)2010-07-21

No. They work on different principles.

Select as Best AnswerUndo Best Answer

user
orksecurity (author)Re-design2010-07-21

The Joule Thief is not an "amplifier" in any normal sense of the term. However, a Joule Thief might be used to power an amplifier.

Select as Best AnswerUndo Best Answer

user
NachoMahma (author)orksecurity2010-07-22

. I suppose one could call a joule thief a voltage amplifier. Still not going to work since audio amps are power amplifiers (voltage and current are amplified, not just voltage).

Select as Best AnswerUndo Best Answer

user
orksecurity (author)NachoMahma2010-07-30

I'd call it closer to a transformer. (It's essentially a DC-to-DC converter, right?). And I wouldn't normally call a transformer an amplifier. But your usage may differ; de gustibus...

Select as Best AnswerUndo Best Answer