This circuit of dozens of watts uses germanium transistors and the critical components are transformers. The circuit is from the 1960 Mullard transistor application manual.
This interesting bandpass filter using an operational amplifier 741 has its cutoff frequency...
January 2017 - Mouser Electronics is announcing the availability of the new OptoMOS® CPC1010N...
This circuit was obtained in the Audio Handbook of the National Semiconductor of 1977. The...