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 Single Chip FM Radio Circuit help

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bubu Posted - Oct 25 2014 : 09:46:50 AM
I found your Single Chip FM Radio Circuit on http://www.aaroncake.net/circuits/Fm_Radio_Circuit.asp and I want to know that for getting the signals, how much ohm speaker should I use.

DEBOJYOTI
2   L A T E S T    R E P L I E S    (Newest First)
audioguru Posted - Oct 29 2014 : 7:52:36 PM
The very old radio IC has been obsolete for many years.
Did you find a real one or a fake one?
Aaron Cake Posted - Oct 26 2014 : 10:35:15 AM
The circuit outputs line level audio to drive a headphone or amplifier. If you wish to drive a speaker, then you need to use an amp circuit (there are several on the circuits page). Or you could be very crude and just use a single transistor to drive a speaker by connecting the base to the audio out through a lowish value resistor (value unimportant...1K) and 0.1uf capacitor, collector to V+ and emitter to ground with speaker in series. You'll likely need a few hundred ohm resistor in series with the speaker to prevent heating the transistor. 2N2222 or equivalent.

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