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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SWR meter (CB7063E)
Standing wave ratio or SWR is an important measure of whether all power from a transmitter is being...
Adding Reset to a CMOS Monostable (CB128E)
Here we show how to add a reset key to the monostable using two NAND gates (CB127E). When the key...
Portable MW Transmitter (CB18515E)
This short-range circuit can act as a wireless microphone. We got the schematic and the printed...