This circuit was suggested by National Semiconductor in one of its manuals. The LM108 integrated circuit, uncommon nowadays, can be replaced by an equivalent. The power supply must be symmetrical.
This circuit was found on an 80's Ham Radio. The transistor admits equivalent. The circuit can...
The input resistance of this circuit is 60k and the pass band from 20 to 20kHz. The circuit is...
This circuit was proposed by an old American documentation for listening to SSB stations. The...