Found in a documentation from the 70s, this circuit causes the courtesy light of the car to remain on for an additional time after the doors are closed. The time depends on C1.
We found this circuit in the Linear Applications Handbook of the National Semiconductor of 1994....
This simple continuity tester, whose configuration can be found several times on this site, is...
This circuit is from old documentation. The operational amplifier is uncommon nowadays. The...