N° of component 


  This circuit acts as a VU-meter when connected at the output of any audio amplifier, triggering a row of LEDs. The circuit should have 12V power supply or remove the amplifier itself to operate. We found this circuit in an old documentation from Spain.

Circuit Bench

  • Neon Lamp Timer (CB229E)

    When the power is on, the 1 µF capacitor charges slowly by R1 and P1 until then on trigger...

  • Bell Sound (CB1492E)

    This circuit generates the sound of bells. We found it in a 1977 Radio Shack publication. The...