How do I merge two signals?

[Neutral]

I have an A/B box in my effects chain and I usually run the two lines into two seperate amp channels on my twin reverb. I some times have to ues an amp with one input. How do I merge the two signals with out them effecting or loading each other?

[Rodgre]

There are a few simple mixer circuits out there that will do exactly what you need.

I wouldn't just combine the signals "Y-cord" style.

Roger

[smoguzbenjamin]

The mini-mixer from GGG does put all 4 input signals together, and feeds 'em into 2 sides of a double op-amp... Shouldn't that work fine?  :?

[petemoore]

You musta not built the right stompboxx,,,Besides the statement would make more sense for me if it were stated in the first person...

[Mike Burgundy]

http://www.muzique.com/schem/mixer.gif
this is a good solution and also illustrates the principle well.

[petemoore]

At runoff groove...it pans left and right chains and mixes them...I built a accelorator treadle for mine

[Neutral]

Cool, Thanks.
the mixer at http://www.muzique.com/schem/mixer.gif is definitely the right track but I need it to run off a 9v battery. I'm trying to keep this as small as possible. I only need to mix two signals and I don't need a master volume. If any one knows an even simpler circuit, let me know.

Cheers.

[John Egerton]

I've been lookingfor something similar to merge a theremin signl on my pedalboard....

Only niggle is that I too don;t want a master volume as I find it messes with my tone. Could I just omit the master volume pot?

I'm not too bothered about the 12 volts thing as there is a 12 volt socket in my pedalboard just begging to be used since the day I bought it.  

If the master volume is omitted, will all signals remain at their riginal volume levels?

[smoguzbenjamin]

There the statement's different. Happy now pete?

I breadboarded the mini mixer project from generalguitargadgets and it works fine... No problems there, except for maybe a little bit of volume loss, but me being lazy I put a volume boost after it. :mrgreen: Now to put everything in a box...  :roll:

[Neutral]

Looks like the GGG ones perfect fo me, I'll build it tonight but with only two inputs and no individual input volumes.

I put a volume boost after it

How did you do the volume boost?

also how long (aprox) will this circuit run on a 9v?

Cheers