Triac driver (CB22446E)

The presented circuit uses an optocoupler to trigger a triac. We found it in a Popular Electronics from 1992.

400 mW amplifier TL431 (CB14549E)
This configuration, different from Motorola's 1990 Linear Databook, uses a voltage reference...
Photometer (CB17052E)
This simple Bargraph photometer with 4 LEDs was found in a 1997 documentation. The scale is...
Telegraph Practice Oscillator (CB4890E)
This traditional oscillator circuit that can be found elsewhere in this section uses general...