This circuit, from a 303 Circuits from the 90s, uses a telephone pickup coil as a sensor to capture power grid noise, thus making it possible to locate electrical wiring.
Found in General Electric documentation from the 1980s, this high speed perforated tape reader...
Found in 1980s Radio Electronics, this circuit triggers the ignition of a rocket after the...
Based on a PLL 567, this circuit serves as a receiver for the CB9574E circuit. S tuning is done in R1...