On 2008-05-27 22:00 +0100, Simon Williams wrote:
> Fons Adriaensen wrote:
> > Use an active DI-box, in particular if the guitar output has
> > to be split for a guitar amp as well.
>
> What if I can't afford DI-boxes? Which is best to use?
Try it and see but I bet they both will sound muffled. If you have
a bipolar supply hanging around, you can make an unbalanced buffer
for cheap.
Tip of jack from guitar to ground via a 1 M to 5 M resistor and to
the non-inverting input of a TL071. Output of TL071 to its
inverting input and to a 220 ohm resistor. Other end of resistor
to tip of jack to line input. Leave the offset adjust pins
unconnected. Sleeve of both jacks to ground.
^ +15 V
|
-----------
| _ | |
| 2| -_7 |
--|- -_6 | 220
| _---+--^v^v------\ /| TO
FROM |\ /-------+---|+ _- TL071 \/ | LINE
GUITAR | \/ | 3|_-|4 _______| INPUT
OR BASS |_______ < | |
| > 1~5M | ---
--- < v -15 V
|
---
You could surely do something similar with a unipolar supply (9 V
battery or wall wart) but I don't know how. There is probably a
bipolar supply inside your mixer, though. If it doesn't exceed
+/-18 V, you could use that. Shouldn't be a problem, a TL071 draws
very little current.
--
André Majorel <URL:http://www.teaser.fr/~amajorel/>
Do not use this account for regular correspondence.
See the URL above for contact information.
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