Wednesday, August 13, 2014
Simple AM radio
This is a very simple AM radio schema using only two transistors. The coil L1 and variable capacitor C1 forms the tank schema. Transistor Q1 does the job of demodulation. The demodulated signal will be available at the base of Q1.This audio signal is coupled to the base of Q2 for further amplification. The amplified audio signal will be available at the collector of Q2. Please note that, this schema will work properly only in places with good signal strength.
Notes.
* The schema can be assembled on a Vero board.
* A 9V PP3 battery can be used for powering the schema.
* Coil L1 can be made by making 65 turns of 24SWG enameled copper wire on a 100mm long, 10mm diameter ferrite rod. A tapping must be made on the fifth turn.
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