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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Digital Capacimeter (CB16780E)
The accuracy of this 3-digit digital capacitor meter depends on the tolerance of the components used and...
Battery Charge Indicator (CB26002E)
This circuit was found in the March 1997 Electronics Now magazine. It uses a common analog...
Four Transistors Reflex Receiver (CB18301E)
This is a diagram of a 1958 commercial receiver. The circuit was found in documentation at the...