Meter Buffer Amplifier?

Grant Richter grichter at execpc.com
Wed Jun 23 20:01:10 CEST 1999


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?

Any suggestions appreciated.

Grant



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