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Old 6th July 2004, 05:57 PM   #11
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Hi KYW,

what would be a good output trans? I have got a UTC W-786 600 to 600 trans on hand, thinking about using as a balance cable to single conversion .
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Old 7th July 2004, 07:42 AM   #12
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Quote:
Originally posted by ChuckT
Here is the output stage. Cheapo opamp at work here, will replace them with either AD8066 , AD8620 or LM6172 .
Do not work.

You need +/- 15V op-amp.
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Old 7th July 2004, 08:06 AM   #13
Previously: Kuei Yang Wang
 
Join Date: Nov 2002
Konnichiwa,

Quote:
Originally posted by ChuckT
what would be a good output trans?
Depends upon the circuit you are going to use. There are quite a few good 1:1 types, but they are not really suited to directly interface with the DAC.

Quote:
Originally posted by ChuckT
I have got a UTC W-786 600 to 600 trans on hand, thinking about using as a balance cable to single conversion .
Should be fine for that.

Sayonara
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Old 7th July 2004, 08:08 AM   #14
Previously: Kuei Yang Wang
 
Join Date: Nov 2002
Konnichiwa,

Quote:
Originally posted by ChuckT

Here is the output stage. Cheapo opamp at work here, will replace them with either AD8066 , AD8620 or LM6172 .
Any of the above will do fine. I'd say AD8620 on the analogue inpoit side, AD8066 or LM6172 on the output side.

Quote:
Originally posted by stef1777
Do not work. You need +/- 15V op-amp.
Actually, the supply in the Behringer was +/-12V, last time I looked (inside my own), so au contraire, does work just fine....

Sayonara
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Old 7th July 2004, 08:21 AM   #15
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Quote:
[i]Actually, the supply in the Behringer was +/-12V, last time I looked (inside my own), so au contraire, does work just fine....

Sayonara [/B]
I'm very surprised.

Mine is +/- 15V. It use JRC LM7815A et LM7915A in the switched power supply (It has 17,7V before the regulators). It has +15V on the red wire, -15V on the second wire of the power connector.

I used OPA2604AU.
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Old 7th July 2004, 02:56 PM   #16
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Thanks KYW.

Strange, it seems there are different configure out there for this gear. Mine uses LM317 & 7805. I found only those 2 regulators on board, maybe there are smaller ones that I've missed.
Here's the pic.
Attached Images
File Type: jpg deq2496_regulator.jpg (63.0 KB, 4509 views)
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Old 7th July 2004, 03:11 PM   #17
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These are for the digital board power only.

In fact, the +/- 15V regulators are in the switched power supply. Have a look. It's wrote on the PCB (IC1: 7815 and IC2: 7915).

Power connector:

1 Red = +15V
2 = -15V
3 = 9V
4 = 15V ground
5 = another ground
6 = 5V
7 = 3V

But the best if you want to be sure is to test on the op-amp pins...
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Old 9th July 2004, 06:42 AM   #18
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Default Ceramic cap coupling?

Your are right, I see the 7915/7815.
And thanks for the power connector info, very useful.

One thing is bugging me after a bit of probing on the output circuit. Why are there ceramic caps directly couple to the balance out, it is directly in the signal path!!!
Surely this can't be good!!
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Old 9th July 2004, 06:44 PM   #19
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Post a picture.
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Old 9th July 2004, 06:53 PM   #20
tiroth is offline tiroth  United States
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If they are connected to ground, it is to remove switching noise.
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