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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High Gain FET (CB13680E)
In the figure we have the way to obtain 500 gain from a FET. FETs can be BF245 or MPF102. The...
Telephone Call Detector (CB13057E)
With the circuit shown in the figure, we have a logic signal to activate a calling device when...
4-decades variable oscillator (CB8286E)
Found in 1980s Electronics Design, this circuit covers 4 decades of frequencies with a unique...