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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Three Tone Oscillator (CB12661E)
From an old manual of unijunction transistors, this oscillator generates different tones when the...
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A negative floating regulator capable of supplying an output voltage of -100 V with regulation of 20 mV for...
Toxic Gas Detector (CB6365E)
Found in a Hands On Electronics of the 80s, this circuit makes use of a gas sensor of the time....