This circuit for audio applications was found in an English magazine from the 80's. The circuit has a pass band below 3 kHz making it ideal for telecom applications.
This low noise audio amplifier step uses only one transistor and is high enough to operate with low...
We find this circuit in an old American documentation, but it is perfectly current by its...
This circuit for old photo enlargers was found in a 1970s RCA manual. The components are from the...