May I suggest a LM317 with a "parallel"?? power PNP transistor , such that the LM317 supplies a few hundred mA,with the PNP transistor passing the balance? .
This is a simple circuit available "web wide"
The max current for a LM317 is 1.5 A (obviously with a heat sink)
On Tue, Apr 25, 2017 at 3:13 AM, Paul Swift <paulswift6@...> wrote:
I would not use a switch mode PSU on this unit. Most of the create a lot of unwonted noise and need a lot of filtering to get ride of it.
I would just use a simple one with a good regulator. I use a LM 317 and set the output to 13.5 volts. But I would also put a small heat sink on the device as it will get warm on transmit.
Use a transformer with an output voltage of no more that 15 volts at 2 amps. That will be fine for you.
You can find many schematics on the interweb so just make one.?