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Free tutorial electronics circuit diagram
 

Free layout electronics circuit diagram

   


 

  AUDIO

  Stereo Channel Selector
  Intercom Using Transistor
  Infra Red Headphones

  CD-Rom Audio CD Without Comp
  Indicator For Telephone
  Ultrasonic Pest Repellent
  Sound Controlled Flip-Flop
  Ultrasonic Switch
  Digital Volume Control
  5 Band Graphic Equalizer
  Audio Light Modulator
  Bass-Treble Tone Control Circuit
  Audio Level Meter (VU Meter)