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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100 MHz Oscillator (CB8051E)
This oscillator was found in a 1967 EEE. The transistor supports a modern equivalent. The power...
Low Pass Salen Key Filter (CB5199E)
This second-order low-pass Salen-Key filter was obtained from an American 1980s documentation. Formulas...
Electronic Mousetrap (CB4450E)
This interesting circuit of a 1988 documentation consists of a mouse trap where the sensor is left to...