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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Undervoltage Switch with the CA3140 (CB12144E)
In this circuit the CA3140, an operational amplifier, is used as a comparator with the zener diode...
5-LED Driver U2X7B (CB25439E)
This linear LED scale circuit was found in the February 1992 issue of Radio Electronics magazine. Note...
Low Distortion OTL Amplifier (CB23538E)
This amplifier stage without an output transformer was found in Radio Electronics magazine from...