Reference Vcc supply

[SmittyHalibut]

A common input voltage is 13.8v +/- 15%. But OHIS uses 5v as its Vcc.

Using an LDO will dissipate up to 2W of heat. Not desirable.

Design a switching buck supply:

• as simple as possible, but no simpler.
• commonly available parts
• inexpensive
• efficient
• low noise (smp followed by LDO?)
• capable of at least 200mA. More would be better so it can be used locally inside the radio adapter too.
• open source, available for all to use.