Automotive Fuse Monitor (CB26299E)

We found this simple car fuse monitor circuit in a William Sheets. The LED lights up when the fuse blows.

Humidity Detector (CB15618E)
Taking advantage of the high input impedance of the operational amplifier 741 and its high gain we...
Thermocouple Amplifier (CB390E)
This old circuit uses na operational amplifier not easy to find in these days. But the circuit can be...
Solid State Power Switch (CB5292E)
This configuration makes use of an integrated circuit of the time having been found in a 1976 NASA...