We found this circuit for receiving shortwave on a mediumwave radio in a 1986 Hobbyst Electronics PE. The circuit has the received band given by T1 which can be an FM IF.
This circuit is from 1994 documentation by National Semiconductor. What it does is convert the...
This circuit with the known PLL 567 can be found in other versions in this section and in this...
This sophisticated circuit of the coin-toss game was found in an American 1980s documentation. The circuit...