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 |

Variable Voltage Controlled Attenuator (CB4236E)
This circuit was obtained from an American 80's documentation. The balanced mixer can be shown in...
Gain 10 Tone Detector (CB4906E)
This circuit was found in an application note of the LTC1164 from Linear Technology of the 1990s....
1-Transistor Amplifier Stage (CB961E)
This circuit has a type of bias called "virtual earth" providing good gain, given by R2. The...