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Old 13th June 2012, 11:25 AM   #3301
AndrewT is offline AndrewT  Scotland
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Analogue input or digital input?
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Old 13th June 2012, 02:09 PM   #3302
winslow is offline winslow  United States
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Analog
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Old 13th June 2012, 05:03 PM   #3303
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You still need to find a way to drive the ADC balanced with a 2.5VDC offset. Hard to do with caps
Also there is 10dB attenuator just before the ADC on the DSP board to make it compatible with pro levels.
You can take it out (see the schematics, it's a 330ohm SMD resistor) so that can be fixed easily.

jan didden
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Old 13th June 2012, 05:21 PM   #3304
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Question input resistor

Hmm interesting

Quote:
Originally Posted by janneman View Post
You still need to find a way to drive the ADC balanced with a 2.5VDC offset. Hard to do with caps
Also there is 10dB attenuator just before the ADC on the DSP board to make it compatible with pro levels.
You can take it out (see the schematics, it's a 330ohm SMD resistor) so that can be fixed easily.

jan didden
Take it out like in bridging?
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Old 13th June 2012, 05:35 PM   #3305
winslow is offline winslow  United States
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I've seen people use transformers for the inputs and outputs to get around the I/O board...but not caps on the inputs.

Was just curious since I wanted to change everything over to single ended/RCA inputs and outputs.

I can build it, but no way I can design it...that's way over my head.
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Old 13th June 2012, 06:20 PM   #3306
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Quote:
Originally Posted by winslow View Post
I've seen people use transformers for the inputs and outputs to get around the I/O board...but not caps on the inputs.

Was just curious since I wanted to change everything over to single ended/RCA inputs and outputs.

I can build it, but no way I can design it...that's way over my head.
Yeah you can do it, with transformers you can float the secondary tap on 2.5VDC and drive the ADC from the secondary balanced.

jan
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Old 13th June 2012, 06:21 PM   #3307
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Quote:
Originally Posted by peterhenk View Post
Hmm interesting



Take it out like in bridging?
No its 2 resistors of 330 ohms in series with each phase and then 330 ohms across the ADC input pins. Taking it out raises the sensitivity 3 times being 10dB approx.

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Old 13th June 2012, 07:49 PM   #3308
winslow is offline winslow  United States
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I may just put the sucker in the car stock and go with that for a while.

Though Edcor transformers aren't so expensive that I couldn't do all of the inputs and outputs at once and be done with it...90 bucks for all of them and never have to worry about ground loops is a good investment for the car environment I think. I would spend as much or more money on 8 XLR adapters.

Most folks it seems are going with 1:1 600-600 ohms, but I saw a few folks using 1:4 and Jan recommended 10k-10k.
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Old 13th June 2012, 09:12 PM   #3309
BudP is offline BudP  United States
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The transformers we built for Pano here on diy were 1k:1k. The 1k was met with inductance and I haven't any idea why you would want to use a 10k to 10k, where that 10k was also met with inductance. Just adds unneeded DCR and causes a poor match to the opamp out of the DAC chips. Our units were more expensive than Edcor's and were higher performance, physically they drop right in to the space available and Pano mounted them on a PCB he made up. Edcor makes fine transformers and I am sure you will like them.

Bud
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Old 20th June 2012, 09:15 PM   #3310
winslow is offline winslow  United States
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For the passive out users, do you loose the ability to reduce output levels in the program? I didn't know if this is being done in the DSP or in the analog section.
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