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Posted

the first thing that happens is that all inputs get converted to balanced.

So to use the thing as single ended you would need a bunch of dual rca to

xlr adapters, and you have to jumper across the input amp, then it actually

would work. The tape out would be unbuffered this way.

I do have the cardas stacked rca jacks in house, so i could do a single ended

board.

Posted

Fine, i'll make a single ended version. I may be able to get both on the same board if i make it a bit bigger.

Then you stuff it one way for single ended and another for balanced.

The input chip is not compatible with single ended. So there will have to be 2 different single ended front

ends.

Posted

Fine, i'll make a single ended version. I may be able to get both on the same board if i make it a bit bigger.

Then you stuff it one way for single ended and another for balanced.

The input chip is not compatible with single ended. So there will have to be 2 different single ended front

ends.

I'm fine with building a full balanced version. I'd rather have a full balanced one that is prototyped and known to work perfectly than screw with perfection.

Posted (edited)

well this should confuse most people

http://gilmore.chem....inputboard6.jpg

Stuff it with one set of parts and its balanced, and you need 2 boards,

stuff it with another set of parts and its unbalanced and you only need 1 board,

to keep it the same size, for unbalanced you give up an input.

The unbalanced input buffer is an lme49720 dual opamp, or your favorite

in a gain of 1 setup.

Needs a bit of checking now.

Edited by kevin gilmore
Posted

I'm efficient :D

I had been thinking about how to do this from the very start, so once i got the

cardas parts, it was actually pretty easy. The fact that cardas can't even supply

a dimensional drawing of what is supposed to be their own part is very sad.

  • 3 weeks later...
Posted (edited)

smile.png unbalanced/balanced input board, multiamp and blackhole.

6895701891_5e2b1d46c8_z.jpg

Anyone in the US interested in prototyping the blackhole and multiamp? I have 1x set of blackholes and 1x set of multiamp (2 boards each, no PSU) that I can spare. No cost, just pay for shipping.

Edited by Lil Knight
  • 2 weeks later...
Posted

Hmm.. This baby is going to need two full size enclosures

I'm thinking 4 x preamp boards + 1 x input board + 2 x KG attenuator boards + local regulation in "audio box".

Transformers/rectifiers/1st bank of caps (or PS with remote sensing skipping regulation in audio box) + display + arduino/whatever in the "noisy box".

I2C and Power supply (and potentially remote sensing) connections between the boxes.

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