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Low Drain Buffer TL061

From dwardle–(at)–hug.co.nz Fri May 26 15:47:56 CDT 2000
From: “David Wardley”
Newsgroups: alt.guitar.amps,comp.sys.ibm.pc.soundcard.tech,rec.music.makers.guitar,sci.electronics.misc
Subject: Re: Guitar level vs line level
Date: Sat, 27 May 2000 07:40:00 +1200
Xref: geraldo.cc.utexas.edu alt.guitar.amps:253187 comp.sys.ibm.pc.soundcard.tech:123862 rec.music.makers.guitar:398889 sci.electronics.misc:80405

bg wrote in message
> From an artistic standpoint , electric guitars sound better
when they are
> run as close to unloaded as possible. This doesn’t mean that
you are not
> allowed to enjoy the sound of a loaded down pickup , just that
> transients and ringing of the strings is damped if you run into
low Z. A
> tube based preamp will do wonders , but a 4558 IC also has an
input Z around
> 1 meg and up , and makes a pretty good unity gain buffer or low
gain (2x or
> 3x) preamp for guitar. I have tried all kinds of solid state
preamps , and
> transformers to match a guitar to a mixer. Tube is by far the
best , but for
> a cheap and very easy solution , the 4558 will do a good job.
> bg
> Tomi Holger Engdahl wrote in message …

There must be a thousand ways to match high z pickups into main
amps. I prefered battery power for reasons of portability,
independence on stage, and reduced hum problems. But batteries
cost money!!

I use a low current op-amp – a TL061. It is arranged happily to
operate with single rail supply with a 9V battery. Input Z is one
megohm, output Z is a few hundred ohms, voltage gain is about x3,
and the frequency response holds up past 30khz. The best part is
the current drain – about 230 microamps. The battery lasts for
….years rather than months.
A short input lead helps reduce the effects of those cable
The same unit could arguably drive any main amp or other input.