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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E-Listening Transmitter (CB14861E)
The presented circuit emits signals in the FM band, which can be picked up from a distance of a...
Loop Antenna Q Multiplier (CB13648E)
I found this circuit in a documentation for radio amateurs from 1975. The FET could be the BF245....
Inverter Amplifier 741 (CB16813E)
The traditional inverter amplifier configuration with the operational 741 shown in the figure is...