Using a 4046 PLL this circuit generates rectangular signals in three wavebands that depend on the capacitors used. The circuit is from a Radio Electronics from December 1989.
This small transmitter appeared in the March 1989 issue of Radio Electronics magazine. The...
I found this simple circuit in an English magazine from 1984. The circuit can be assembled easily...
This sophisticated circuit of the coin-toss game was found in an American 1980s documentation. The circuit...