output buffer for bass

[Boogdish]

I've been searching around for an answer to this question and I've also just finished reading the impedance article at GEOFEX, sorry if it's been covered before but I couldn't find it.

It's my understanding that a passive bass will give out a lower impedance signal than a guitar in general.  Because of this I'm assuming that bass amps are designed to see a signal with lower impedance than a guitar signal.  So my question is, if you were putting an output buffer on an effect for bass should you shoot for a lower output impedance than you would for the buffers used in guitar effect circuits?

[evilpaul]

Generally speaking, with any amplifier (including ones with a gain of 1  ) it is desirable to have a high input impedance, and a low output impedance.

Your bass amp should have a high enough input impedance that it will be able to handle signal sources from a range of (low enough) impedance values.

To answer your question more directly, the lower you can get your circuit's output impedance, the better, but that goes for any circuit really.

[any]

Maybe something like this?

http://www.muzique.com/lab/superbuff.htm

[bool]

My suggestions:

a) http://www.albertkreuzer.com/start.htm (check "preamps" - "other preamps ... ")
b) build a BJT-follower as used in Ibanez-Boss etc. stompboxes. (you can "match" it to your instrument by changing the usual 510K base resistor. My personal favorite is using 680K with BC550C trans.)