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Old 8th July 2012, 03:43 PM   #841
acccruz is offline acccruz  Portugal
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Default Salas Shunt Reg Capacitors

Hi to all:

Please let me know your opinion about use Panasonic FM 220/35 on Salas Shunt reg.

Im unable to find Rubycon ZA 220/35, but I have in my hands 10 of 330/35 - its critical if I use them?

Many thanks for your help,
Antonio
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Old 8th July 2012, 03:46 PM   #842
UV101 is offline UV101  England
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I've used Panasonic FM in my amplifier as they have slightly higher voltages available. ZA are obsolete but I've been using Rubycon ZLG in place of ZA on most things with excellent results. Best of all, they are a fraction of the cost ;-)
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Old 8th July 2012, 03:51 PM   #843
acccruz is offline acccruz  Portugal
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Just one more question please:

What about your opinion about Rubycon ZL or ZLH? Its more easy to find it on eBay than the ZLG!

Thank you!
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Old 14th October 2012, 07:52 AM   #844
freax is offline freax  Australia
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Hi I'm considering constructing one of these DAC boards + Optical to I2S converter (Opus WM8804) in the same 1U project box (1U high, 10 inches deep), however.

I need it ALL to run from 12v-13.5v DC (Float SLA voltage) as I would like to use it in a mobile studio setup and I like to have my equipment run from a DC UPS system. So, wasting as little amount of power as possible on capacitors and linear regulators would be ideal. Also noise is an issue...

Can I get some suggestions on what to use for a DC-DC converter which would be suitable for the dac?

Btw I've tried finding the schematic in the thread, but the link is dead?

Also, seeing as I'm super-poor I was hoping for a cheap buffer stage kit too, any suggestions on what to use for that? Transistor is fine, though a starved heater buffer stage would be nice.

I should also add that I do not have much experience with DAC's, however I can build complex kits within an hour or so, I feel confident in tackling this project, its just that budget and enclosure constraints are limited.

Last edited by freax; 14th October 2012 at 08:19 AM.
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Old 14th October 2012, 08:46 AM   #845
freax is offline freax  Australia
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Nevermind, I just found out about the red baron, far better and more compact for what I want, imho.
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Old 19th October 2012, 11:53 AM   #846
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Default Red Baron connection to Tube-I-Zator

Hi everyone.

I'm finishing up the Red Baron dac board. I'm already running the Tube-I-zator (latest version and the 1st generation dac board).

I'm not installing the MOSFET Buffer I/V stage parts, and I see from the pictures that the signal out is then taken from the (L/R) Master/Slave output next to the TDA1541A dac chip on the Red Baron board. Doesn't this need a ref (or ground) as well , or am I not seeing something?

Could it be that the REF is taken from under the Red Baron board to the Tube-I-zator?

Thanks,

Chris
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Old 20th October 2012, 09:09 AM   #847
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Quote:
Originally Posted by crobbins5421 View Post
Hi everyone.

I'm finishing up the Red Baron dac board. I'm already running the Tube-I-zator (latest version and the 1st generation dac board).

I'm not installing the MOSFET Buffer I/V stage parts, and I see from the pictures that the signal out is then taken from the (L/R) Master/Slave output next to the TDA1541A dac chip on the Red Baron board. Doesn't this need a ref (or ground) as well , or am I not seeing something?

Could it be that the REF is taken from under the Red Baron board to the Tube-I-zator?

Thanks,

Chris
Hi Chris,

look here to my grounding scheme:

Click the image to open in full size.

If you connect it like this with a star GND, you could use the GND of the Tube-i-Zator for the RCA-GND connction.
I hope this answer your question.

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Old 20th October 2012, 10:41 AM   #848
AndrewT is offline AndrewT  Scotland
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The screen from the main transformer should connect with a very short lead to the main enclosing metal box (Faraday cage), not a long lead to the star ground (Main Audio Ground).

I don't understand why each regulator has a separated power supply wire from the return supply wire. Surely the flow and return of each regulator should be a twisted pair into the part of the DAC that consumes current.

Note also that all the wires feeding current have no return route associated with them. They must all be circuits and MUST have a flow and return. Showing anything less is confusing.
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Last edited by AndrewT; 20th October 2012 at 10:43 AM.
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Old 23rd October 2012, 01:24 AM   #849
Pocoyo is offline Pocoyo  Indonesia
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Hi Oliver

Looks like your DAC didnt have any change now
this is the perfect time to start solder

BTW i just have Tubeizator, DAC, shunt & hv (no need supply pcb)
what is the other pcb i need to complete this ?
(i saw a little pcb in the middle of your big picture)

btw BOM this DAC can not see again (look blur) in this thread
maybe you need to attach them

Best regards
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Old 23rd October 2012, 04:57 AM   #850
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Quote:
Originally Posted by Pocoyo View Post
Hi Oliver

Looks like your DAC didnt have any change now
this is the perfect time to start solder

BTW i just have Tubeizator, DAC, shunt & hv (no need supply pcb)
what is the other pcb i need to complete this ?
(i saw a little pcb in the middle of your big picture)

btw BOM this DAC can not see again (look blur) in this thread
maybe you need to attach them

Best regards
Hi Pocoyo,

the small pcb above the DAC V2.3 is the I2S switch (USB/SPDIF).

All BOMs you will find in my blog HERE.

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