This sophisticated circuit was found in the November 1978 issue of Radio Electronics magazine. Based on CMOS logic, it has several types of timing, controlling the wiper relay.
This TTL circuit was found in the December 1990 issue of Radio Electronics magazine. The circuit has...
Found in an Electronics World of 1968 this circuit can use any SCR and diodes depending on the...
Placed near a telegraphic transmitter (CW) and with a small antenna or pickup, it reproduces the...