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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Second Order Unity Gain Filter (CB25817E)
Using a 741 op-amp this circuit high-pass to 10 kHz was found in the February 1995 issue of...
LASCR tachometer 2 (CB9354E)
Found in 1965 General Electric documentation this circuit applies to a LASCR used as an optical...
Logic Test (CB8911E)
Using transistors and lamps, this simple circuit was found in Popular Electronics. The circuit can...