This circuit was obtained from Dutch documentation from 1967. It uses transistors of the time which can be the BFY50 and 51 for the output and the BC series for the others.
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...