[R-390] Meters

[Scott, Barry (Clyde B)]

Not original, but better than two big holes in the front panel  :)

Anyone been there / done that?  I seem to recall someone doing this.  If so,
can you repost?

Thanks,

Barry(III) - N4BUQ

-----Original Message-----
From: pete wokoun, sr. [mailto:pwokoun@hotmail.com]
Sent: Thursday, May 08, 2003 10:49 AM
To: R-390@mailman.qth.net
Subject: RE: [R-390] Meters


Ahhhhh, therein lies the problem!  This meter only requires 17 millivolts 
across it to achieve full scale deflection.  This makes it a very sensitive 
meter.  Typical meters of this size are higher resistance and require 60-100

millivolts or more for full scale deflection.  You can get the right 
resistance or current but getting them both together is what makes these 
meters 'special'.
One trick used is to get the right resistance with a shunt and use a small 
DC amplifier on a piece of perf board to drive the meter to get the right 
current.  But then, this isn't 'original', is it?

pete KH6GRT