Modify behringer DEQ2496? - Page 2

ChuckT · 6th July 2004, 06:57 PM

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 .

stef1777 · 7th July 2004, 08:42 AM

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.

ThorstenL · 7th July 2004, 09:06 AM

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

ThorstenL · 7th July 2004, 09:08 AM

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

stef1777 · 7th July 2004, 09:21 AM

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.

ChuckT · 7th July 2004, 03:56 PM

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.

stef1777 · 7th July 2004, 04:11 PM

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...

ChuckT · 9th July 2004, 07:42 AM

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!!

stef1777 · 9th July 2004, 07:44 PM

Post a picture.

tiroth · 9th July 2004, 07:53 PM

If they are connected to ground, it is to remove switching noise.

9th July 2004, 07:42 AM	#18
ChuckT diyAudio Member Join Date: Nov 2002 Location: HK	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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6th July 2004, 06:57 PM	#11
ChuckT diyAudio Member Join Date: Nov 2002 Location: HK	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 .

7th July 2004, 04:11 PM	#17
stef1777 diyAudio Member Join Date: Jun 2004 Location: Paris	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...

9th July 2004, 07:44 PM	#19
stef1777 diyAudio Member Join Date: Jun 2004 Location: Paris	Post a picture.

9th July 2004, 07:53 PM	#20
tiroth diyAudio Member Join Date: Dec 2001 Location: Pittsburgh, PA, USA	If they are connected to ground, it is to remove switching noise.

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