Found in a Popular Electronics from the 90s, this circuit makes use of an unusual integrated today. The coils are for the medium wave range.
We found this 555 integrated-circuit tester in an old Electronics Hobbyst from 1977. The circuit is...
This TTL circuit with the 7493 makes the binary count of the pulses sent by a flip-flop with the...
This tone recognizer circuit that relies on R5 and C1 was found in the December 1994 issue of...