With this circuit found in an American documentation from 1969 it is possible to vary the selectivity (Q factor) of a tuned circuit. The operational is from that time.
This circuit can be used in a toy organ. The frequencies are determined by the capacitors selected by...
May 2016 - Mouser Electronics is sourcing the new high-performance audio amplifiers with bipolar...
This circuit was obtained from the 1976 Siemens Integrated Circuits Manual. It is the circuit for...