Communication systems
Electronic

Lamp signaler with wire control Telegraph receiver
Single Wire Communications System
 

Code Practice Oscillator with Tone Control

Morse Code Practice Oscillator
Solar Powered Code Practice Oscillator
Light/Sound Code Practice  
Code practice unit Code practice unit II
Morse Code Transmitter Intercom with headphones
Simple transistor intercom circuit Intercom with Amplifier 01
Intercom with Amplifier & Relay Intercom with Amplifier & Relay & 4066
  Intercom with Amplifier & 4066
 

Morse Code

 

 

 

 

 

 

 

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