We found this circuit in a Radio Electronics issue from July 1969. The lamp remains on until C1 opens. The time is given by capacitor C1.
The circuit presented, from a 2005 documentation, can provide from 1 W to 2.5 W of output when...
To power small projects, we found this circuit in the Radio Electronics magazine of May 1977. The...
This circuit is from the Motorola Linear Databook from 1990. The integrated circuit used is...