On Thu, May 29, 2008 at 3:39 AM, Andre Majorel <aym-psd@xxxxxxxxx> wrote: > 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. > Wouldn't any non-"True Bypass" stomp box do the same thing? _______________________________________________ Linux-audio-user mailing list Linux-audio-user@xxxxxxxxxxxxxxxxxxxx http://lists.linuxaudio.org/mailman/listinfo/linux-audio-user
