This circuit detects when a powered circuit suffers a malfunction, lighting an LED. The supply voltage can be changed according to the monitored load.
We found this circuit in a 1981 publication. We applied an audio signal, for example, a music...
The circuit presented was obtained in the 1994 Linear Applications Handbook from National...
An inproved version of the circuit CIR129E is shown here. The resistorR1 must be at least 5 times...