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.
The traditional circuit was taken from a French magazine Radio Plans that no longer exists but can...
The circuits below were found in amarican publication of the year 1958. The transistors are...
We found this circuit in a 1983 English magazine, but it can be easily assembled with the BC548...