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Circuit Bench

  • Transistor radio (CB22539E)

      This simple 2-transistor radio is from Radio Electronics in October 1952. The circuit outputs a...

  • Frequency Divide-by-10 TTL - Circuit Using the 7490 (CB253E)

    TTL square signals can be divided by 10 using this circuit. The maximum frequency depends on the...

  • Transmitter for remote control (CB21645E)

      This circuit was obtained from a Popular Electronics from January 1967. It has a...

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