Automatic TV power off (CB5945E)

This 80's circuit turns off a TV or other appliance after a set time. The base is a 555 IC and the relay is according the supply.

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Power grid frequency meter (CB9791E)
This simple circuit to monitor the frequency of the power grid uses an analog indicator. The...
Multi Light Effect (CB17010E)
We found this circuit in a 1997 documentation. It can drive sets of LEDs or lamps through SCRs in...
Timer with PUT (CB24085E)
This timer circuit uses a unijunction programmable transistor. The time is given by the capacitor and...