Modulated HeNe laser power supply (CB21186E)

This high voltage gas laser source was found in an American publication from the 1990s. The circuit has an input for PWM modulation.

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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...