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Capcitor type for Vref
Capcitor type for Vref
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Old 9th January 2004, 04:05 PM   #11
Peter Daniel is offline Peter Daniel  Canada
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I mentioned previously that I was using 4,700u Cerafine across 6V battery terminal. Initially it seemed like it worked better this way, until a friend visited me (who knew my system from before) and his first remark was the chestiness to the sound, somehow it seemed very colored in a midrange region. So no caps across battery anymore. I tried to add the silver cap in this place, just out of curiosity and the sound changed in predictable way. Suddenly highs became center of attention, but I didn't like it.
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Old 9th January 2004, 04:14 PM   #12
Peter Daniel is offline Peter Daniel  Canada
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Here's a pic of my testing setup. I installed an IC socket with all pins on ea site connected together and extention of the wires are soldered to V+ and GRND pins of TDA1543. In this way I can change the caps on a fly, without even switching the power off.
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Old 9th January 2004, 06:08 PM   #13
fmak is offline fmak
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Quote:
Originally posted by Peter Daniel
Here's a pic of my testing setup. I installed an IC socket with all pins on ea site connected together and extention of the wires are soldered to V+ and GRND pins of TDA1543. In this way I can change the caps on a fly, without even switching the power off.
---------------------------------------------------------------------------
Peter

It looks as though you are suing SA or SC OSCONs and not the audio SG or newer SEP non magnetic.

Fred
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Old 9th January 2004, 06:15 PM   #14
Peter Daniel is offline Peter Daniel  Canada
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Good point. I was using what I had on hand and was not aware of other, possibly better types. Those are the ones I bought from Chinese guy who was advertising them on a forum.
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Old 9th January 2004, 09:39 PM   #15
Zoran is offline Zoran  Serbia
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I have expiriance in tube design against the sonic impessions :
one mistake continuing about the values of the power suply caps...
they are often too much higher then needed.And the sound is somehow slow
in the low mid and bass without
room beetwen the details...
probably the same thing repeats in the D
design...expecialy whwrw the speed is from vital importance...
For instance the QUAD II have only 2 x 16 micro F in PS...
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Old 9th January 2004, 10:13 PM   #16
fmak is offline fmak
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Quote:
Originally posted by Peter Daniel
Good point. I was using what I had on hand and was not aware of other, possibly better types. Those are the ones I bought from Chinese guy who was advertising them on a forum.
------------------------------------------------------------
The best source of OSCONs is Farnell. They do SGs (discontinued) and SEPs with OFC leads. The industrial types are magnetic.

Amazing, but you can buy OSCONs (SA and SC) in the Hong Kong electronic market (AP Liu St) for 10 to 20 cents US!
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Old 10th January 2004, 09:22 AM   #17
A 8 is offline A 8  Sweden
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This is indeed an interesting thread but I am a bit confused.
I think fmak was asking about Vref* specifically and not about general ps decoupling caps!?
*( Vref like in Pin 19 on the PCM1704 or Pin 3 on the PCM63)

As most of you I've tried different cap types but have not done any tests on Vref only.
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Old 10th January 2004, 11:49 AM   #18
fmak is offline fmak
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Quote:
Originally posted by A 8
This is indeed an interesting thread but I am a bit confused.
I think fmak was asking about Vref* specifically and not about general ps decoupling caps!?
*( Vref like in Pin 19 on the PCM1704 or Pin 3 on the PCM63)

As most of you I've tried different cap types but have not done any tests on Vref only.
--------------------------------------------------------------
You are right; the issue is:-

What are the important capacitor properties for Vref, stability meaning low DA, av rejection, or what?

I find OSCON audio type useful but have not much clear idea why.
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Old 10th January 2004, 02:29 PM   #19
Peter Daniel is offline Peter Daniel  Canada
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I can't comment on those chips as I don't use them. My PCM1704 DAC is collecting dust for months now. Sorry
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Old 10th January 2004, 02:41 PM   #20
A 8 is offline A 8  Sweden
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I would think experiance from any dac chip's vref decoupling cap would be of interest.

Don't the popular 1543 have a reference voltage decoupling pin?
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