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, found in a 1994 documentation, uses 20 A 2N5448 triacs or equivalent and should be...
This traditional amplifier configuration is from the National Semiconductor's Linear Applications Handbook...
This circuit is from GE technical documentation from the 1970s. The circuit can be implemented with SCRs...