This circuit was found in 1967 General Electric documentation. The transistors of the time can be replaced by modern equivalents.
Within a range of values, this circuit converts input voltages into corresponding currents. The...
This second-order low-pass Salen-Key filter was obtained from an American 1980s documentation. Formulas...
This circuit is from 1971 documentation. It generates a ramp given by the input signal. The FET...