This circuit is indicated for supplying the CB17495E transmitter. The BD135 must have a small heat radiator and the zener may eventually have a higher voltage.
This low-current power supply was obtained in Japanese documentation from 1968. The currents are...
We found this circuit in a European publication from the 1970s. The transistor is made of...
This interesting project was found in a 1995 documentation. It controls the temperature of the...