Automotive Fuse Monitor (CB26299E)

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

attery Powered Microphone (CB16432E)
B In this circuit we show how to use an electret microphone powered by a small battery (can be of...
1 kHz Bandpass Filter with the 741 (CB13570E)
This circuit is from a 1976l filter cookbook. The circuit has a factor Q = 3, and must be supplied...
6 W amplifier (CB9055E)
Using transistors at the time, this circuit was found in a 1970s documentation. Transistors support...