CW Practice oscillator


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.

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6 thoughts on “CW Practice oscillator

  1. Seetharaman

    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.

  2. Avinash

    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 ??


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