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The Ultimate DIY Part 2 ? The KGITSOJC


kevin gilmore

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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.

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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.

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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
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  • 3 weeks later...
  • 2 weeks later...

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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