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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Economic Shortwave Receiver (CB21210E)
We found this simple shortwave receiver in an Electronics Now from the 1990s. Details of the coil...
Flashing Timer Switch (CB16959E)
This circuit is from 1990 documentation. When we press D1 the lamp remains on for a time interval that...
Servo Motor Amplifier (CB12522E)
The circuit shown in figure 1 serves to control a servo motor with a current of up to 200 mA. The...