This circuit is used to turn on the headlights when it gets dark. The circuit is from an Electronics Now magazine from October 1998. The power transistor must be equipped with a heatsink.
This sophisticated function generator circuit appeared in the September 1972 issue of Radio...
We found this circuit in a 1975 publication. The circuit can be made with more modern equivalent...
The open output voltage on this circuit is approximately three times the peak value of the input...