AC Switch with Triac (CB25855E)

The load controlled by this circuit depends on the triac used. The circuit is from Electronics Now magazine from June 1995.

150 mA LDO with Texas Instruments TPS780 (CB12548E)
The LDO series (Low Dropout) TPS80 from Texas Instruments (www.ti.com) can provide output voltages...
Quinary Trigger (CB6805E)
Suggested by an American publication, this circuit has 5 operating conditions indicated in the...
Light-operated relay (CB20700E)
Found in a documentation from the 70s, this circuit can be implemented today with ease. The relay...