Long times with DI3T1 (CB21422E)

This PUT circuit was found in a 1967 General Electric SCR manual. The basic component is unusual, and the capacitor must be low-leakage.

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Spy Transmitter (CB19424E)
This small crystal microphone transmitter was indicated in an 80s spy book. The range depends on...
Recording head amplifier (CB24226E)
The figure shows how to use an operational amplifier with a low impedance head. The gain is...
Voltage Comparator Shield (CB4588E)
Voltage comparators, such as those in the LM139/239/339 series, consist of devices that can be...