In a September 1992 Radio Electronics article, we found this basic 555 circuit used to generate fixed times. Capacitor C1 and resistor R1 determine the time. The circuit drives an LED.
This filter has a regulated source configuration. It can be implemented with almost any...
We found this filter configuration in an old documentation. It is one of many possible ones that...
This circuit is from a 1998 Electronics Now and can be easily assembled since it uses a common...