[sdiy] DIY Mixer - please help!

[cheater cheater]

Hmm - very good point.

On another note: what are the most important considerations when
designing/building a summing bus?

You know, I'm thinking that this could also be a useful alternative
for people doing multitracks who want analogue summing instead of
digital..

Thanks
D.

On Wed, Sep 2, 2009 at 10:30 PM, Amos<controlvoltage at gmail.com> wrote:
> seems like I remember there being a lot of old Neve schematics about if you
> search;
> you can hardly get better channel strips than his designs, although most
> will be pot controlled rather than CV-controlled.
> Nothing a few Vactrols can't usually fix, unless you are very picky about
> precise calibration in which case a more rigorous CV-control scheme may be
> desired.
>
> Google turns up 181,000 hits for "neve schematics" - so it's a place to
> start, anyway...
>
> On Wed, Sep 2, 2009 at 4:47 PM, cheater cheater <cheater00 at gmail.com> wrote:
>>
>> Hi guys,
>> It has come so far that I can't go on without a mixer, and, well,
>> nothing I see on the market is satisfying to me right now. This can be
>> of great use for modular synths as well since I would want it to be
>> fully CV controllable. This is in part propelled by the fact that I
>> have bought a TX816 which will need a proper mixer in order for me to
>> be able to use it at all.
>>
>> I am currently collecting ideas as well as resources. It seems as
>> though it's not so easy to find the schematics for most mixers that -
>> at least I consider - are interesting. The first step is to come up
>> with a good summing bus design. I think solid state is good for a
>> start, but since it's all DIY, it'll be possible to swap it out for a
>> tube stage if there's a need for that.
>>
>> I understand this list might not be the best forum to find out about
>> this stuff - but I searched about for mixer/console DIY with people
>> who actually *knew their stuff* when it comes to analogue music
>> hardware and I simply couldn't find much interesting. If anyone has
>> any recommendations, please do tell me. I trust the people here so I
>> ask you guys first :)
>>
>> Here's a quick writeup of what I have in my brain right now. Most of
>> it is probably wrong, so please correct me.
>>
>> What I am thinking of is a simple but effective modular approach which
>> consists of:
>>
>> 1) multiple summing busses
>> 2) multiple VCAs
>>
>> Each channel is one VCA that has CV inputs, a single input, and a
>> single output to a single bus. Of course a stereo channel is that
>> multiplied by 2. With a CV approach it's going to be very easy to
>> control two channels with just the fader of the left channel, but
>> that's a trivial comment.
>> The bus sums and gives a single high-headroom output.
>>
>> The first thing to do is to make a good summing bus. I understand that
>> to do this I will need to come up with a good op-amp design. What I am
>> looking for is good headroom. Can someone recommend anything good?
>> Supposedly the Harrison 4032c is pretty good. If you guys have heard
>> the headroom in MJ's 'Thriller' - that's that. Has anyone got leads on
>> that?
>>
>> As far as the mixer's format and general set of abilities, I am
>> inspired by things like Manley mixers (EveAnna many positive
>> affirmations to you if you can read this) and Chandler Limited (but a
>> little less so because I haven't spoken to Mr Chandler or Mr Limited)
>>
>> I find that a fully voltage controllable design could be useful. For
>> example a feedback compressor could be built which outputs CV that
>> will be fed into the VCAs. Therefore the whole signal chain from the
>> sound source to the recorder could be just two VCAs - I guess that's
>> better if someone's looking for this sort of thing.
>>
>> Is there some interaction between the 'mixer strip' and the summing
>> bus that I have left out? Or is my concept of how a mixer should be
>> designed just plain wrong? :)
>>
>> Thanks guys
>> Damian (probably wrong)
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