Random neon lamps (CB7236E)

This circuit for 6 lamps was found in old American documentation. The supply is of high voltage and the current drawn is very low.

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Hearing Aid Amplifier (CB21549E)
This circuit is from a 1954 transistors publication. The transistors are the CK722 among the first...
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This sophisticated circuit of the coin-toss game was found in an American 1980s documentation. The circuit...
Interval for wiper (CB22113E)
This windshield wiper interval was found in an old documentation. The SCR can be the C106 and the...