Manual Clock 7400 (CB22411E)

This circuit to produce clock pulses is manually driven. The circuit is TTL and must be powered by 5 V.

Radiation thermometer (CB7242E)
Found in a 1968 Mullard manual, this circuit measures temperature by infrared radiation. The...
CIR25402S CB25378E (CB25378E)
This test instrument was found in the April 1991 issue of Radio Electronics magazine. The circuit has...
Operational Linear Photometer (CB13418E)
This simple photometer was found in a 1977 Radio Shack manual. The sensor is a photocell, which can...