two transistor radio

Posted on Feb 6, 2014

Here is a simple circuit for a one transistor Audion type radio powered by a 1. 5 V battery. It employs a set of standard low-impedance headphones with the headphone socket wired so that the two sides are connected in series thus giving an impedance of 64 ©. The supply to the circuit also passes through the headphones so that unplugging the headphones turns off the supply.

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

Using an Audion conguration means that the single transistor performs both demodulation and amplification of the signal. The sensitivity of this receiver is such that a 2 m length of wire is all that is needed as an antenna. The tap on the antenna coil is at 1/5th of the total winding on the ferrite rod. For details of the antenna coil see the article Diode Radio for Low Impedance Headphones. This circuit is suitable for reception of all AM transmissions from long-wave through to shortwave.

Leave Comment

characters left:

Related Circuits

  • New Circuits



    Popular Circuits

    Active band-reject filter
    Remote on-off switch
    Automatic Porch-Light Control Circuit
    Multiple Servomotors
    Phase shift and Wiens bridge oscillator
    Luminescent Generator
    Simple Direct Conversion Receiver
    Classic car battery charging circuit diagram