This signal multiplexer circuit for early low-frequency oscilloscopes was found in the May 1977 issue of Radio Electronics magazine. The circuit requires a symmetrical source.
Found in Radio Electronics from May 1959, this transistor tester is quite sophisticated. The...
We found this circuit in a 1998 documentation. It tests common household appliances to see if they...
This filter is suggested by Motorola's Linear Interface ICs of 1993. This same configuration...