This automatic brightness control that uses an LDR as a sensor, was found in American documentation from the 1980s. Resistors in series with LEDs depend on the desired current.
We found this circuit in a 1998 documentation. It tests common household appliances to see if they...
We found this electronic organ circuit in a 1987 documentation. The circuit should be powered by...
This circuit was found in an Electronic Design from the 80's. It shows how to use a MOSFET driver with...