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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Bistable Logic Relay (CB25738E)
We found this circuit in the magazine Eletcronics Now of July 1994. The power supply is according to...
Pendulum Alarm or Sismograph (CB869E)
This simple circuit produces a tone when triggered by any vibration picked up by the sensor. The...
Center Tap Simulation with Diodes (CB4140E)
In the figure we show how two diodes can be used to simulate the center tap of a push-pull driver step....