Sine to square converter (CB7329E)

Using a 555 this circuit was found in old documentation, but it is still valid.

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High Power AC Shield AC (CB18266E)
This circuit allows to drive a triac with high power AC load from a CMOS output or directly from a...
Pre selector with varicap tuning (CB9172E)
This circuit for the medium wave range was suggested by a Popular Electronics from the 90s. The...
Power control (CB23569E)
This switching circuit with transistors was found in Radio Electronics magazine from June 1964. It...