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Old 4th June 2004, 07:01 AM   #11
Fin is offline Fin
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Quote:
Originally posted by JohnW
Try a large Oscon, say 100uF to 470uF with a working voltage greater then 3V

The pin must also be decoupled with a ceramic cap - say 100nF.
Thanks John - would a Rubycon ZA be any good for this job?
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Old 4th June 2004, 08:17 AM   #12
JohnW is offline JohnW  Hong Kong
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Hi Fin,

I find that whichever cap you have in the Vref (and any other position) you always hear there sound signature.

Due to the varied circuit operating conditions (the Vref position requires decoupling at both Low and High frequency), the only way to find out if a cap type will sound ok is to try.

Ive not tried ZAs in the 7323 Vref position, but I would you could even go as high as 1000uF, but it will take say 1 minute for the CD player to reach its full output level on power up.

Better to use the external Vref circuit I posted earlier - then the choice of capacitor becomes far less sensitive.

John
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Old 4th June 2004, 08:27 AM   #13
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Thanks again John

I'll have a look at your circuit and try to work things out (no background in electronics). Might go with a good quality cap for now - so I can start listening to music again - while I study some more electronics.
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Old 13th August 2004, 03:02 PM   #14
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Default Vref and SAA7350

Completed the JohnW Vref circuit described in the following threads and used it to supply the high impedance Vref pins on SAA7350.

Capcitor type for Vref

Bass is tighter and more defined, especially the really low stuff. Also interesting and somewhat unexpected is the improvement in soundstaging.

Easy to build and worthwhile. Should just note that the 5534's require decoupling caps at their power supply pins. Leave these out and the beast oscillates.
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Old 12th September 2008, 07:24 AM   #15
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Default Which pin is Vref?

Hi,

I know this is an old thread but I have a Rotel RCD965BX in near new condition. I have had it since new and have been using it as a transport for an 8 X TDA1543 NOS DAC I built a couple of years ago.

Can somebody please tell me which pin on the SAA7323 chip is the Vref pin under discussion here. I look at the 7323 data sheet and can't see a pin labelled "vref"

However I see VREFL (pin 7) and a VREFR (pin 3) which are the reference voltage inputs for the analog channel grounds, and are normally connected to pin 16 VRO (internal voltage reference output). Both these pins are decoupled by 47uF BlackGates and 47nF ceramics.

I also see pin 17 VRC (internal reference voltage high impedance node requiring an external smoothing capacitor) On the 965BX this is decoupled by a 4.7uF Black Gate and 47nF ceramic.

Is pin 17 (VRC) the Vref pin described in this discussion? if not, what pin should I be looking at?

Thanks for your help.

Joe
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