MadSci Network: Physics

Re: How can transform low voltage from a earphone output to light a bulb?

Date: Sat May 2 06:43:02 1998
Posted By: Sean Hunt, Secondary School Teacher, Science, Sultan's School
Area of science: Physics
ID: 890457341.Ph

Dear Manuel,

what you need is an op-amp with a gain of about 1000.
An old radio or hi-fi will do or you could raid any electronics equipment you have. 
Your amp will need an external power supply (a 12V battery) and you may wish to put a potentiometer on it to set the noise level minimum.
The earphone output connects to the amp which connects to the 3V or 6V lamp. 
If you need more detail resubmit your question.

Sean Hunt

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