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.
The deviation of characteristics of this circuit normally referred to the temperature is very low....
Found in a 1969 Electronics World, this circuit generates low frequency signals with two...
Suggested by Texas Instruments in 1968 documentation, this circuit uses components from the era....