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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Frequency triplicator with varicap (CB4113E)
This circuit triples the frequency of a low-intensity signal and is suitable for VHF and UHF...
MAX30003 Analog Front End for Biopotentials (COM148E)
November 2016 - Maxim's MAX30003, an Analog Front End (AFE) for biopotentials with clinical grade...
12 V Monitor (CB859E)
If the input voltage falls below 12 V the LED glows up. Other voltages can be monitored by...