Meter Buffer Amplifier?

[Don Tillman]

   From: "Grant Richter" <grichter at execpc.com>
   Date: Wed, 23 Jun 1999 13:01:10 -0500

   Mouser carries a nice Modu-Tech +/-15 volt center zero meter,
   Part number 541-MSQ-DVV-15U.
   Problem is the meter resistance is rated at 100 ohms per volt,
   for a total resistance of 3K ohm. This is too low for synthesizer
   applications and the meter should be buffered. A straight TL071 buffer
   springs to mind, but TL071s don't like to go with 1.5V of the rails.
   Rail to rail op-amps don't come in 30 volt ranges, and I'd rather not
   add a separate +/-18 volt supply.

   So, question, any of you old timers seen a discrete meter buffer
   design that will go rail to rail in +/- 15 volt systems?

Drive it differentially, with two opamps, one inverting, one
noninverting. 

  -- Don