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DIY mixer

O

O'Dubhain82

Oct 2, 2008
7
0
#1
Hi,

I was recently given a 100 volt line PA and would
like to adapt it to use as a backup for use in my
pub duo. We need 2 instrument inputs and 2 vocals.

The PA has a panel which houses a row of 6 cards,
each with xlr inputs and 3xtone control and a volume
knob.

Is there a simple way to convert this panel into a mixer
with a master volume and line level inputs?

Any thoughts appreciated.
 
#3
If you're not afraid of a little DIY here's a way to sum all those very easily, Figure 2 could be your answer. This guy has some very nice projects, you could even snag the PC board from him. A few colleagues of mine have used his stuff before and he's very reliable and good to work with.


Link Removed

The op amp he specs is about as common as they come so nothing exotic, expensive, or difficult here. Good luck :)
 
#5
dhsierra1 said:
If you're not afraid of a little DIY here's a way to sum all those very easily, Figure 2 could be your answer. This guy has some very nice projects, you could even snag the PC board from him. A few colleagues of mine have used his stuff before and he's very reliable and good to work with.


Link Removed

The op amp he specs is about as common as they come so nothing exotic, expensive, or difficult here. Good luck :)
Click to expand...


It works much better with even a modest opamp upgrade though. OPA 2134 or OPA2132 both work really well in it, in my experience.

To the OP: don't forget that you will need line transformers for your PA cabs too.
 
#8
O'Dubhain82 said:
Yes its very simple.
Would be about a 100 bucks for this adapter

I think you may be right. It does look very good.
Appreciate the replies,
Click to expand...

the problem w/the XENYX mixer suggestion is that it too has a preamp stage in it so when you plug in those cards you'll have gain staging issues big time. Passive 6 input line mixer is the way to go, plus you'll need a transformer for the speakers as mentioned by Passinwind (who I believe is a soundman and thus knows this stuff more than I do).
 

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