Inverter and programmable rectifier (CB8781E)

Found in a 90s Maxim's documentation, this circuit applies to almost any comparator.

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Old amplifier (CB23684E)
This is a 1960s amplifier setup found in a period publication. The circuit uses a special driver...
Tone Recognizer Link 567 (CB19312E)
The receiver circuit LM567 recognizes the tone set on 555. The connection between the circuits can be made...
Continuity Test (CB23712E)
This circuit, which consists of an audio oscillator, was found in a Radio Electronics magazine from...