splitter design, transformers?

[7rojo7]

Hello I'm designing a splitter, I don't really know much about it except that I need to mult a line and put a transformer across one end before it reaches it's destination. Mechanically it seems like a piece of cake. My current needs are to have 48 mic lines and 16 monitor feeds. I've found 200 pin connectors, 25 pin connectors, 8 channel stage boxes, xlr connectors, rack mount pre punched panels, etc...
It's which transformers to use, how to secure them and how they should be connected electrically that I would like some advice on. Any input would be helpful, thankyou

[jason]

hi,

I'd recommend checking out the jensen transformers website. In the white notes section there is an article about doing this.

Jensen has some transformers specifically desgned for splitting and isolating line and mic signals.
cheers,
jason

[Tim Farrant]

An alternative is Sowter (who are a bit closer to you), they do a mic splitter as well and you can buy online.

I had a quick look for you, the 4079 type will acheive what you want to do, but id you need phantom power facilities you will need the 4297 type. There is a circuit there on how to hook it up.

Sowter

Hope this helps
Tim

[Bernd G]

Jensen I think also makes a "8 transformer strip".
Do not think that this will be cheap - I gather about $ 3K for a 24 channel splitter box, material wise. It might be worth considering simply purchasing a WHIRLWIND pre-made box. I built a splitter box once - with Jensens, what a PITA. But it is so solid, a tank could run over it - and it takes a crane to lift it. The Sowters might be a bit cheaper.

Good luck

Cheers

[7rojo7]

Thanks a lot for the good tips. I went to the Sowter site and I think the 4079 is a good call for the mic section, maybe even too much. I will be using this mainly to get my split direct, using my phantom power, giving a split to the Audio service which they will also split, so I'd need my direct and only 1 feed from the transformer. I'm going to call someone there (I have to be isolated on my line level too and +17 dB seems a little low maybe).
I would buy a premade splitter if I could find one with the right connections. Mine will have mic ins from 6-8 channel stage boxes (the same that I use in my studio) and send 16 line level channels to monitors for a Furman HDS16 system with 6 satellites (the same that I use in my studio) all on 25 pin cacmil connectors, a 200 pin cmil connector that goes to the remote control space (that will have to have its own breakout box 200 to 8x 25) and 64 xlrs for the mic split and line split, it should all fit in 6 rack spaces. I'll also have a single cable running my 2 video, talkback, listen back and comm lines but they won't need to be isolated.
With the 4079 or the 4279 is it possible to have 1 direct signal and then the 2 isolated signals from the transformer? I'm not so sure I'd like the signal I get at my end to have run through a transformer first.
This is all an attempt to be able to bring my studio (all in flight cases anyway, no fancy studio furniture) out to remote gigs without having to rely on the audio services split, which we've had problems with in the past. All in All it's going to cost a bundle, but in the long run it will save time and provide security. Time is the enemy.
Thanks again, I wish the guys on the software and computers forum would ring in as nicely as here.

[JayCrouch]

what you really need to do is go over to the remote possibilties forum.

Steve Remote (the forum's moderator), has probbably built more splitters than any of us have ever touched.

Let him know what you need, and he can help - or build it for you for a fair price...

just tell him jaycrouch sent ya...