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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Multisensor Alarm (CB6080S)
This circuit is from a 1968 publication. Here we have several types of resistive sensors with...
Dual Voltage Follower (CB6121E)
This circuit is from a 1965 Electronic Design. The transistors may be general purpose and the...
Comparator with LM3900 (CB25168E)
This is the basic configuration of a voltage comparator with the Norton LM3900 amplifier. The...