Triac driver (CB22446E)

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

Low Voltage Indicator (CB14979E)
In this circuit the LED lights up when the voltage drops below the value set in the trimpot. The...
4 to 20 mA interface (CB21054E)
This circuit was obtained from a Linear Technology manual from the 90's. The integrated circuits are...
MOSFET power stage (CB22366E)
Found in a 1995 documentation, this circuit is an alternative output to the previous circuits. The MOSFETs...