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 digital electronic game circuit was found in a 1982 publication. It randomly draws the...
September 2017 - Mouser Electronics already has the AP431S adjustable regulator from Diodes...
The transistor of this circuit can be the BC558. The circuit is from an old documentation...