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.

| Clique na imagem para ampliar |

Touch switch (CB8727E)
Found in a 90s Popular Electronics, this touch switch uses a single sensor. PLLs are common today....
CMOS Logic Test (CB14954E)
We found this circuit in an old documentation from 1979. It is a logic level tester that is...
40 kHz repellent (CB20815E)
This ultrasonic insect repellent was found in American documentation from the 1980s. The...