Low Drift Sampling and Hold (CB21227E)

This circuit was found in National Semiconductor documentation from the 1990s. It applies to modern components.

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Power Failure Alarm (CB25348E)
This circuit triggers an alarm when the mains power is cut off. The circuit was found in the July...
Tuned null indicator (CB22314E)
This acutely tuned circuit was found in American documentation from the 1960s. The transistors are germanium...
MW Transmitter (CB20809E)
This small AM transmitter was found in American documentation from the 1980s. Transistor support...