This circuit detects when a powered circuit suffers a malfunction, lighting an LED. The supply voltage can be changed according to the monitored load.
This is one of the many anti-deboucer circuits the reader can find on this site. The base is TTL...
The sensor for this light relay found in a 1967 Japanese magazine is a common photocell. The...
The circuit presented was found in the Linear Applications Handbook of the National Semiconductor of 1994....