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.

Operational audio amplifier (CB21109E)
In the figure we have the basic configuration of an operational amplifier for audio signals. The...
Night light (CB6803E)
This General Electric circuit produces pulses of light only when light stops shining on the...
Two controls relaxation (CB9247E)
Found in an Electronic Design of 1964 this circuit has a control for the frequency and another for the...