My PCB ( RaduinoX) has a place for a 1W resistor
to lower LCD Back light current.? It is marked "R9", but I ship
it with a shorted wire across it.
This could also be used for a switch for back
packers to turn off the Back light.
Mike, WA6ISP
?10/31/2017 5:34 PM, Dexter N Muir wrote:
I did that for 'tuning clicks'. 220uF *just* did the job - I'd
recommend 470 or more. My original (banjaxed) raduino was
drawing excessive current, though still under 1A, so my 47E was
2W (what was to hand). My new (un-modded) raduino runs cool
anyway, but I left the R and C in place - insurance? Swap sides
for the 7805 is pretty much a given.
Mike, have you considered a 500E pot for display brightness, or
a switchable resistor, in series with the (series) LEDs? The
existing resistor is marked 111 - I presume 110E - so something
of that order (shouldn't need to be wire-wound) would give a
useful 'dimmer' for less-intrusive night-ops.
73 de ZL2DEX
--
Mike Hagen, WA6ISP
10917 Bryant Street
Yucaipa, Ca. 92399
(909) 918-0058
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