Single transistor radio


Posted on Feb 5, 2014

Here is the circuit diagram of a simple radio that uses one transistor and few other passive components. The C6 and L1 forms a tank circuit which picks up the signal from your desired radio station. Diode D1, capacitor C2 and resistor R1 does the detection of the picked signal. The detected signal is coupled to the base of Q1 through capacitor C3. The


Single transistor radio
Click here to download the full size of the above Circuit.

Q1 gives required amplification to the signal. The resistor R2 is used to bias Q1. R3 limits the collector current of Q1. The audio output will be available at the collector of Q1 and it can be heard by using a high impedance head phone. This radio will work only at places where there is reasonable radio signal strength.




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