Timer 555
Pratique du morse (WC)

Fig. 6, CW Practice Oscillator:

CW stands for 'Contineous Wave' or Morse-Code. You can practice the morse-code with this circuit. The 100K potmeter is for the 'pitch' and the 10K for the speaker volume. The "Key" is a morse code key.

 

 

 

 

 

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