We found this circuit in documentation from the 90s. The circuit uses components that are still common today, turning off a load after the programmed time. The time is given by the capacitor.
This circuit was obtained in the Linear Applications Handbook of the National Semiconductor of...
This circuit is indicated for audio tests, the tracks being selected by the capacitors. The...
This circuit can be implemented with more modern operational amplifiers like the 741 and its...