ultra miniature transmitter

Posted on Feb 7, 2014

This transmitter has a size about that of a large coat button. The transmitter accepts direct voice input and work on a single watch type button cell that serves several tens of hours together. As shown in schematic the transmitter is probably the simplest one ever designed. A single transistor, a few passive components and a small carbon button mike

ultra miniature transmitter
Click here to download the full size of the above Circuit.

do the trick. The coil is an ordinary MW spare`s antenna coil on a small ferrite slab. The condenser mike is of the type used in tape recorders. A button trimmer is used for tuning. There`s hardly anything more to be explained about the circuit. The assembly in a matchbox sized enclosure is suggested in Figure. The circuit should be made on a dot matrix board. The cell can be any kind of button(watch cell). Adjust the receiver to a dead spot. When no station is being received, begin speaking into the mike while adjusting the trimmer to obtain the loudest and clearest output at some point. Tape the trimmer there and the world`s smallest(hopefully it all depends on how you make if)transmitter is ready to transmit.

Leave Comment

characters left:

Related Circuits

  • New Circuits



    Popular Circuits

    Enlarging Light Meter Circuit
    Serial COM port using ATmega8
    Simple Mixer with 4 Input
    gas leakage alarm
    led blinking program with pic16f887
    serial ir transmitter
    Zero degree Celsius alarm
    The Bean-Counter AM Transmitter
    Muscular Bio-Stimulator
    The HiFi amplifier 300B
    Switching power supply monolithic switching regulator DN-25 configuration