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Circuit Bench

  • Telephone Amplifier II (CB19340E)

      We found this telephone amplifier in a European publication from the 1980s. The transistor can be...

  • Clef Generator (CB827E)

    This circuit produces a clef sound when a pulse is applied to its input. The damping effect is...

  • Simple Symmetric 13 V Power Supply (CB20223E)

      This simple power supply is regulated by two zener diodes which, for a current of up to 200 mA,...

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