This small source for low consumption projects was found in an old national documentation. The transistor is for general use and the transformer has 50 to 100 mA of secondary current.
In this circuit the photo-transistor signal is amplified by a Darlington step and then applied to a...
The purpose of this circuit of an American publication from the 70s is to move the signal from an...
This 80's circuit can be implemented with modern equivalent FETs with lower on resistance. The...