Schematic diagram for the One Transistor FM Radio with Improved Audio Gain


Posted on Feb 7, 2014

Connect the two sections of the variable capacitor (C3) in series to linearize the tuning somewhat. That is, use the connections on either end of C3 and don`t use the middle lead. The gain is just enough to drive an earphone. If you live too far away from radio stations, you might have trouble hearing one. There is no option here for an external a


Schematic diagram for the One Transistor FM Radio with Improved Audio Gain
Click here to download the full size of the above Circuit.

ntenna (that would require and extra transistor). If you want a little more audio gain, or you cannot locate a TL431CLP chip, you can use some other audio amplifier in the circuit where pins 1 and 2 of D1 normally connect. You can use an LM386 or a TDA7052 audio amplifier. Quasar DIY project kit #3027 is a complete TDA7052 audio amplifier kit and it works fine in this application.




Leave Comment

characters left:

Related Circuits

  • New Circuits

    .

     


    Popular Circuits

    Announcer DoorBell
    Acid rain monitor
    Dc-motor-drive-with-fixed-speed-control
    Sound Reactive EL Panel Dimmer
    Digital Clock Circuit with T89C51 microcontroller
    heart rate monitor schematics
    model railway turnout control
    pwm using 555 timer ic



    Top