Code Switch (CB6536E)

We found this circuit in a Popular Electronics of the 80s. Used integrated circuits are uncommon today.

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Half wave control (CB21375E)
This circuit for heating elements was taken from a 1966 General Electric manual. The SCRs are...
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This simple circuit with two transistors was found in a 1985 publication. The power can come from...
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This circuit detects signals in a wide range of frequencies, indicating their strength in an...