Will this mixer run on 15v too?

creekree · Posted: Sat Aug 30, 2008 4:30 am Post subject: Will this mixer run on 15v too?

I built this mixer (found on generalguitargadgets) some time ago and always powered it with a 9v battery.
however, i'd now like to use it in my slowly growing modular, using the +15v supply.

i am a little bit hesitant to "just hook it up and see what happens" because i'd like the magic smoke to stay inside ...

can i hook it up directly?
do i have to change some resistor/capacitor values?
should i use a 7809 to power it with 9v?

it would be awesome if someone with more experience could enlighten me.
thanky!

edit: i just noticed that this is my post #100. yay! party!

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synthmonger · Posted: Sat Aug 30, 2008 5:32 am Post subject:

http://www.cgs.synth.net/modules/cgs04_mix.html

fonik · Posted: Sat Aug 30, 2008 5:48 am Post subject:

the mini mixer works with a single supply. actually R11 and R12 work as voltage dividers to form a virtual ground (the supply voltage is split so the actual mixer circuit "thinks" he is working with a dual supply. the offset is removed by the cap on the output AFAIK.

IMO the only reason to use this certain circuit would be to use it with a single supply (and a +15V single supply would work as well, or the +15V of your modular, as you planned to do). and it's good for mixing audio only (removed DC).

if i understood you correct you are looking for a mixer for your modular, so you have a dual supply available!? a simple mixer circuit would be the CGS DC mixer, mentioned by synthmonger. capable of mixing audio or control voltages. i built two myself.

another versatile one would be the attenuverting mixer Wink

creekree · Posted: Sat Aug 30, 2008 6:32 am Post subject:

he guys, thanks for the input!

so if i understood it correctly then i can use this mixer with +15v.
but yes, i do have a dual supply as well. (since last night, hehe)

the only reason i was asking about using this particular design is that i already have built it and i dont want it to go to waste.
i have no use for the mixer in its current state anymore ( it was replaced with an non-diy 8 channel mixer some weeks ago), so i would just make a modular faceplate and re-use the whole thing.
it works really well and i dont want it to just sit in some box and collect dust.

if it only is good for mixing audio signals then this is fine with me - because then i can use it to mix audio signals Idea

but yes, you are probably right - sooner or later i might want a mixer for CV. and 3 more VCAs. more LFOs. more MORE MORE... until the whole room is filled with blinky things and lots of wire.

edit: what would i have to change in order to have it run on a dual supply? (and what would be the advantage?
if only minor modifications are needed then i'll happily do them.

fonik · Posted: Sat Aug 30, 2008 6:55 am Post subject: