This source allows the supply of laser diodes with voltages above 11 V. The circuit is from French documentation and equivalent components can be used.
This is the power supply for the amplifier in the previous circuit. We found it in the same Radio...
We found this circuit in a 1990 documentation. It is totally up to date by the components it uses...
This circuit was found in a 1970s General Electric documentation. Transistors are uncommon today....