On Sun, 05 Apr 2020 12:15:53 +0000, Martin Gregorie wrote:


I added small capacitors (18mm diameter x 35mm long, 35-50v, so
1000-2000 uF capacity or thereabouts for each capacitor - thats a
guestimate since I can't read their markings without major surgery), one
for each battery,
and with a 0.1 ohm resistor in series with it.

Correction: still don't how big the capacitor is but the current limiting
resistor in series with it is 10 ohms (just measured it) so the capacitor
won't charge or discharge more at than 1.2 amps. The resistor is a big
wire-wound resistor in a rectangular ceramic case with the capacitor
taped onto it, so is both mechanically and electrically strong.

But, as I said, since this fixed the problem thats enough to prevent
vario and radio resets if I smack the XLR connector powering my panel. Nav
is fine - got its own internal battery.

The same setup may well sort out a break-before-make switch too, with the
advantage that fitting it across the +12v and ground lines on the panel
side of the switch can most likely be done without disturbing anything
that's already in your panel and is both inexpensive and easy to make and
install.


--
Martin | martin at
Gregorie | gregorie dot org