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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Micro Power LED (CB15111E)
This circuit causes an LED to flash at a frequency determined by the capacitor. The circuit has an...
Analog frequency meter (CB7918E)
Found in American documentation from the 90s, this circuit can measure frequencies on a linear...
FM Optical Transmitter (CB5269E)
This frequency modulated light transmitter is from a 1990s documentation. The circuit may use...