Re: [LAU] OT: Guitar level- Mic or Line?

On Thu, May 29, 2008 at 3:39 AM, Andre Majorel <aym-psd@email-addr-hidden> 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?
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Received on Thu May 29 20:15:06 2008