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 found in the March 1994 issue of Electronics Now magazine. The circuit uses a...
Circuits similar to this appear elsewhere in this section. The transistors can be BC549 (low...
This VFO circuit generates signals from 2 Hz to 50 Hz. We found it in Popular Electronics from...