This toy transistorized organ was found in the May 1970 issue of Radio Electronics magazine. The trimpots are adjusted to the musical notes according to the key.
The purpose of this circuit is to couple an AM modulated circuit to an FM transmitter. The circuit...
The operational amplifier used in this circuit is not very common today and the signal is...
This sophisticated circuit of the coin-toss game was found in an American 1980s documentation. The circuit...