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Old 22nd March 2012, 04:57 PM   #811
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Hi everyone,

i'm looking at a complete DIY DAC kit for my squeezebox duet at an affordable price, am i at the right place?
from the first page, i just saw PCB, is this GroupBuy also providing the whole components, the setup plans, etc?

If i'm not in the right place, my appologies, can you redirect me to the right one please?

thank you in advance
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Old 23rd March 2012, 11:33 AM   #812
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Hi jayce,

this GB includes only the pcbs.

Best regards,
Oliver

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Old 29th March 2012, 08:58 AM   #813
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Hi Olivier,
thank you, do you know if there is any GroupBuy for a complete DAC on the forum? i didn't find it, maybe i didn't look correctly.
Best regards
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Old 1st April 2012, 02:28 PM   #814
regal is offline regal  United States
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Quote:
Originally Posted by dvb-projekt View Post
Hi Ton,

if you want to use two Red Baron DACs parallel with the onboard I/V stage, you must connect it like this:

1st - Every DAC module needs all parts of the I/V stage, expect the I/V resistors. Adjust the DAC output to 0V (DC-offset of the TDA1541A).

Click the image to open in full size.

Dont forget to make the small modification and switch the source and drain of the MOSFET like in this picture !!!

Click the image to open in full size.

2nd - The output of the current buffers on each DAC module (inner four-sided point of the I/V resistor) must be connected together (parallel).

Click the image to open in full size.

3rd - You need only one pair of I/V resistors with 250R value on one DAC module (four-sided / round point).

4th - You connect the DC-Reference Module as followed:

From DAC module

Ref. (Audio out) --> Ref. +5V
GND (DC Digital) --> GND

From DC Ref. Module

GND Ref. Left --> GND RCA Left
GND Ref. Right --> GND RAC Right

You could see it on this photo

Click the image to open in full size.

5th - Trimm the RCA GND to 0V

Click the image to open in full size.


Thats it.

Cheers
Wouldn't it be easier and offer much less risk to just take the audio output from the top of the I/V resistor (red baron's L or R) thru a Coupling cap and use normal ground?

Your alternative scheme gives a lifted ground to the amplifier, although only ~4V, it still isn't good practice IMHO.
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Old 4th April 2012, 07:23 AM   #815
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Quote:
Originally Posted by dvb-projekt View Post
Bargain Sale


Because i need space for the next generation of my DAC,
you could order my ready build DAC module V2.2 with direct input modification
for the special price of


$40 each


Click the image to open in full size.


Worldwide shipping: $ 9
paypal fee: 3,9%


If you are interested, please send me a PM.



The last one is sold!
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Old 4th April 2012, 07:42 AM   #816
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Quote:
Originally Posted by regal View Post
Wouldn't it be easier and offer much less risk to just take the audio output from the top of the I/V resistor (red baron's L or R) thru a Coupling cap and use normal ground?

Your alternative scheme gives a lifted ground to the amplifier, although only ~4V, it still isn't good practice IMHO.
If you want to use the onboard Grounded-Gate MOSFET Current Buffer I/V Stage (-ecdesigns- MK7 version) with two Red Barons parallel, you must connect it as described.
The descripion is from -ecdesigns- because i asked John this question in the planning stage of the Red Baron DAC module

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Old 19th April 2012, 10:14 AM   #817
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Exclamation Usage of two parallel Red Baron DACs with onboard MK7 I/V stage

Quote:
Originally Posted by regal View Post
Wouldn't it be easier and offer much less risk to just take the audio output from the top of the I/V resistor (red baron's L or R) thru a Coupling cap and use normal ground?

Your alternative scheme gives a lifted ground to the amplifier, although only ~4V, it still isn't good practice IMHO.
Here is what John (ecdesigns) said about paralleling his MK7 I/V stage:

Quote:
Originally Posted by -ecdesigns-
Use separate decoupling caps for each chip.

Use separate DEM clock injector circuit for each chip (they can share the same clock source).

Use separate I2S attenuators for each chip.

Duplicate the current buffer circuit for the second DAC and only connect the drains of both MOSFETs together.
You also have to reduce I/V resistor value to 250 Ohms (250 Ohm output impedance)
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Old 20th April 2012, 01:33 PM   #818
regal is offline regal  United States
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Quote:
Originally Posted by dvb-projekt View Post
Here is what John (ecdesigns) said about paralleling his MK7 I/V stage:



Thanks I ddin't mean paralelling, just using one output, unless you can trim the current thru the I/V resistor to be put you right at 0V on the output I would think a coupling cap is in order.

I haven't experimented with mine been waiting on a new batch of bib Salas regs, looks like it is going to be a long one. Do you have the any of your Salas reg board left ?
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Old 20th April 2012, 01:41 PM   #819
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Quote:
Originally Posted by regal View Post
I haven't experimented with mine been waiting on a new batch of bib Salas regs, looks like it is going to be a long one. Do you have the any of your Salas reg board left ?
All my Salas reg modules are in stock!
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Old 22nd April 2012, 11:49 AM   #820
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Exclamation Personal announcement

Well my friends it is time again to say thanks to all of you, who like and ordered my pcbs.

Because i am no developer of electronic circuits but have the knowledge to design pcbs,
i wanted to give something back to the community.

Since i started with my 1st pcb, the Optical-Volume-Control on 15th October 2009,
a small donation from every sold pcb goes to diyaudio.com

Today i am proud to say that your cumulated donation achieve

$ 2.675

Keep on having fun with my pcbs and best regards

Oliver
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