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 circuit was found in an old Radio Electronics, but can still be assembled as the components are...
Found in Motorola documentation from the 1970s, this circuit makes use of period components. The lamp is...
This circuit was obtained in Motorola documentation from 1969. The components are from that time. In...