This circuit is from an American 1964 documentation. Transistors of the time are used, but modern equivalents can be employed.
The integrated circuits used in this 1989 project are uncommon today, including the IF coil that...
This negative bias circuit provides negative voltages from 3.5 to 6.5 V sources. The circuit was...
This low noise, low frequency instrumentation circuit was found in a 1976 NASA circuit manual. The...