CW Practice oscillator

admin August 12, 2008 21 Comments


A circuit diagram that can be used for the generation of CW Morse code is shown here.This circuit can be very useful those who would like practice Ham Radio.The circuit is nothing but an astable multivibrator based on NE 555.The frequency of oscillations of the circuit depends on the components R1,R2 & C1.The circuit can be powered from a 9V PP3 battery.

Circuit diagram with Parts list.



  • The POT R2 can be used for frequency adjustments.
  • POT R3 can be used for volume adjustments.
  • The switch S1 can  be a Morse code key.
  • Luís
    November 20, 2012

    How is this connect to pin 5?

  • Luis Oliveira
    November 19, 2012

    The pin 5 not connect?

  • Anish
    February 13, 2012

    what is the frequency range of this ham radio?? can I be able to tune to its frequency in a FM/SW/AM receiver??

  • Seetharaman
    November 2, 2011

    Hi Avinash this is only an oscillator circuit for practising morse code. (di dah di dah) you will get the sound on speaker. so the hand movement timing can be controlled to produce morse code and practised. This will help you in achieving the speed minimum limit that is 12 words per minute rate for your HAM exam.

  • Avinash
    November 1, 2011

    I did this circuit but I didn’t able to tune to anything. I mean I can listen only the tuning sound of the radio but not any voice signal. What can I do for that ??

    November 14, 2008


Leave a Reply