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

    Auto Fuse for power supply
    Car tv cronograph
    60Hz pulse generator
    Very-short-pulse-width-measurer
    Simple Power Down Circuit Circuit
    Inverter Circuit
    ac Trouble with triac driven dimmer circuit
    The Time Delay Circuit
    Robot shield for Arduino
    High-performance dual-band wireless microphone receiver circuit diagram
    A8902 Typical application wiring diagram



    Top