This is the traditional audio preamp configuration with the National Semiconductor LM382. The circuit has good gain and can be used with magnetic pickups or from signals from an auxiliary input.
This circuit is from Motorola's Linear Interface ICs from 1993. The circuit uses a booster...
Found in a 90s Popular Electronics, this circuit is intended for amplifying analog video signals....
The figure shows a NOR or Non-OU logic function shield using general purpose diodes and a common...