[amsat-bb] Re: G5400 meter lamp mod

[i8cvs]

Hi Bruce, KE0LX

The pilot lamps PL1 and PL2 for Meters M1 and M2 are connected to
terminals 4 and 5 of transformer.

To replace a lamp with a led connect the anode A of a led to katode K
of a diode and katode K of led to anode A of diode then connect a 1.5 k
resistor in series.

If only one withe led is not sufficient to well illuminate the dial connect
two or more led in parallel reducing 1.5 k accordingly.

I have not tried it on bench but it should work.


                         withe  led
                |--------A-|>|-K-----|
4 ---------|                               |   1.5 k
                |                               |--/\/\/\/\------5
                |--------K-|<|-A-----|   1/4 W
                            diode
                          1N 4004
73" de

i8CVS Domenico
----- Original Message -----
From: "charter" <willmarbrowns at charter.net>
To: <amsat-bb at amsat.org>
Sent: Tuesday, September 18, 2007 4:41 PM
Subject: [amsat-bb] G5400 meter lamp mod


> Hello...does any one have a copy of replacing meter lamps
> with LED's. Any help appreciated. Tks
> Bruce   ke0lx
> Amsat #30873
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