Automotive Fuse Monitor (CB26299E)

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

Loudspeaker Protection Delay (CB17465E)
This circuit, found in a 1999 documentation, prevents the speaker from being connected as soon as the...
Power Switch (CB23949E)
This circuit for the power grid was found in the June 1969 Radio Electronics magazine. The load is...
Noise generator (CB9930E)
This circuit takes advantage of the noise generated at the reverse biased junction of a germanium...