Gas laser source with start circuit (CB7839E)

Found in a 73 magazine for radio amateurs of the 90s, this circuit provides a 2 kV voltage with 7.5 mA of current for HeNe laser.

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VCO with Potentiometer Control (CB13130E)
In the figure we show how to add a 100k ohms potentiometer to implement an oscillator controlled by this...
Comparator with indicator lamps (CB9584E)
Found in an American documentation from the 90s, this circuit uses small low voltage lamps (6 to...
Superheterodyne FM Receiver (CB4334E)
The integrated circuits used in this 1989 project are uncommon today, including the IF coil that...