No schematic Karl, but it's quite simple. A regulated 12 V supply for the BitX and prior to the regulator is the feed to the PA. Because of how I have it set up, when I turn it off I turn off power to the supply so the on-off switch on the volume control is rarely, if ever, used.
BTW, did you ever get your friend's BitX going? I'm not far from you and offered my bench but the email probably ended up in your spam box.
Vince.
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On 10/01/2017 05:06 PM, Karl Schwab via Groups.Io wrote:
While reading this thread, I am sure that many builders have wired their
BITX-40's for dual voltages. If you have, I would like to see a posting
here on just how you accomplished it. This would save me a little work
on trying to figure it out, hi hi. I am thinking of dual position
switch, (I would mount it on the rear of the chassis) that would have
the entire radio to operate on 12vdc, with the second position, putting
24vdc on PA only. Please, your schematic here. 73, de KO8S, Karl
On Sunday, October 1, 2017 3:23 PM, Keith VE7GDH <ve7gdh@...> wrote:
Paul (call sign?) wrote...
confused on the e DC power connection instructions...
The post at /g/BITX20/message/23973
that Jerry pointed out pretty much says it all.
Keep in mind that there are two places on the main
circuit board that need to get power. The Raduino
also needs power. The power connection at the back
right of the main board (if you have the PA at the
back) is power to everything else on the main board.
The power connection over near the IRF510 PA is for
the final and nothing else. This is so you can
optionally run the PA at a higher voltage... with a
larger heat sink. If you are going to run everything
on 12V, just connect the three places together
wherever you switch the power on and off and of
course tie all of the grounds together too, avoiding
ground loops.
--
73 Keith VE7GDH
--
Michigan VHF Corp.
