Baxandall tone control (CB9372E)

Found in RCA documentation from the 90s, this bass and treble control uses an operational amplifier from the time that can still be found today.

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Sound triggered flash (CB8703E)
Found in 90s Popular Electronics, this circuit fires an old camera flash of the type with a xenon...
Ultra Selective 1926 Galena (CB15124E)
This circuit is from the magazine La Radio per Tutti of 1926. The primary and secondary coil have...
Digital logical probe (CB7925E)
Found in a Popular Electronics from the 90s, this digital probe uses common components....