This circuit is from an American manual from 1975. The transistors are types of the time, but equivalents can be used, as well as the relay that can be according to the supply voltage.
We found this circuit in old American documentation. It can be implemented with more modern...
The purpose of this circuit is to control the high and low light of a car, detecting when a...
This powerful transmitter for the 27 MHz band was found in a Japanese publication from 1961. The...