BEC

Here's a schematic for a very simple 20V-to-60V DC input to 12V DC output.
All the parts are available at digikey.com and the
parts cost is less than $15 (not counting the circuit board).
I may decide to make a circuit board if I can find some spare time
This same circuit can be used to make a 5V DC output regulator by just
changing the LM2576HV-12 to an LM2576HV-5 and a 6V regulator can be made
by adding a single resistor to the regulator's feedback path of the
5V regulator circuit.