Arcam Delta 70.2 digital filter

simon dart · 7th March 2004, 05:01 PM

Hi,
Just found your site-looks great,

I'm a bit of a digital virgin, but I've had great success moding my TDA1451A equipped player. It's got a SRPP ECC88 output stage with battery negative grid bias, a first order passive filter and some PSU upgrades and sounds miles better than standard.

I'm now looking to the next upgrade and wondered if anyone could advise me on the feasibility of bypassing the digital filter in the SAA7220.

Obviously I'd need to do something about the clock but what else?

Any wise thoughts would be appreciated.

Simon:

aparatusonitus · 7th March 2004, 09:48 PM

Hi Simon,

Everything you need to bypase SAA7220 digital filter and put your cd player in nonoversampling filterlees mode of operation is here: www.xoomer.virgilio.it/hi_fi/com.htm
- if you have SAA7210 or SAA7310 in DIL, connect pin 23 (SAA7220) to pin 11 (SAA7210/SAA7310)
- if you have SAA7310 in QFP, connect pin 23 (SAA7220) to pin 18 (SAA7310)
This will restore mute function.

simon dart · 8th March 2004, 10:01 AM

Hi aparatusonitus,

Thanks for the reply, but the link you posted seems to be dead

cheers,

Simon

simon dart · 8th March 2004, 10:11 AM

Oops found it now,

the mod looks pretty simple, so I might stand a chance!

thanks

Lyra · 8th March 2004, 07:45 PM

Quote:

Originally posted by aparatusonitus
Hi Simon,

Everything you need to bypase SAA7220 digital filter and put your cd player in nonoversampling filterlees mode of operation is here: www.xoomer.virgilio.it/hi_fi/com.htm

The link above seems dead to me......

Lyra

aparatusonitus · 8th March 2004, 07:53 PM

Try this one: www.xoomer.virgilio.it/hi_fi/index.htm

aparatusonitus · 8th March 2004, 08:00 PM

It does't work... Just google the address a bit, then you have it, I hope.

Lyra · 9th March 2004, 08:44 PM

The actual adress was: http://xoomer.virgilio.it/hi_fi/index.htm ....without www.....

Lyra

Fin · 27th September 2004, 02:37 AM

Hi Simon

Is the DAC/Audio board in the 70.2 a single or double sided PCB?

simon dart · 27th September 2004, 09:46 AM

Hi Fin,

The Dac, clock, output stage and various power supplies are on a long double sided board across the back. There's no ground plane unlike the processing board, just traces. I'm interested in why your'e interested!

Simon

7th March 2004, 05:01 PM	#1
simon dart diyAudio Member Join Date: Mar 2004 Location: Herefordshire	Arcam Delta 70.2 digital filter Hi, Just found your site-looks great, I'm a bit of a digital virgin, but I've had great success moding my TDA1451A equipped player. It's got a SRPP ECC88 output stage with battery negative grid bias, a first order passive filter and some PSU upgrades and sounds miles better than standard. I'm now looking to the next upgrade and wondered if anyone could advise me on the feasibility of bypassing the digital filter in the SAA7220. Obviously I'd need to do something about the clock but what else? Any wise thoughts would be appreciated. Simon:

27th September 2004, 02:37 AM	#9
Fin diyAudio Member Join Date: Dec 2003 Location: -	Re: Arcam Delta 70.2 digital filter Hi Simon Is the DAC/Audio board in the 70.2 a single or double sided PCB? __________________ Regards Fin

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7th March 2004, 09:48 PM	#2
aparatusonitus diyAudio Member Join Date: Jan 2004 Location: Split, Croatia	Hi Simon, Everything you need to bypase SAA7220 digital filter and put your cd player in nonoversampling filterlees mode of operation is here: www.xoomer.virgilio.it/hi_fi/com.htm - if you have SAA7210 or SAA7310 in DIL, connect pin 23 (SAA7220) to pin 11 (SAA7210/SAA7310) - if you have SAA7310 in QFP, connect pin 23 (SAA7220) to pin 18 (SAA7310) This will restore mute function.

8th March 2004, 10:01 AM	#3
simon dart diyAudio Member Join Date: Mar 2004 Location: Herefordshire	Hi aparatusonitus, Thanks for the reply, but the link you posted seems to be dead cheers, Simon

8th March 2004, 10:11 AM	#4
simon dart diyAudio Member Join Date: Mar 2004 Location: Herefordshire	Oops found it now, the mod looks pretty simple, so I might stand a chance! thanks

8th March 2004, 07:53 PM	#6
aparatusonitus diyAudio Member Join Date: Jan 2004 Location: Split, Croatia	Try this one: www.xoomer.virgilio.it/hi_fi/index.htm

8th March 2004, 08:00 PM	#7
aparatusonitus diyAudio Member Join Date: Jan 2004 Location: Split, Croatia	It does't work... Just google the address a bit, then you have it, I hope.

9th March 2004, 08:44 PM	#8
Lyra diyAudio Member Join Date: Nov 2003 Location: Norway	The actual adress was: http://xoomer.virgilio.it/hi_fi/index.htm ....without www..... Lyra

27th September 2004, 09:46 AM	#10
simon dart diyAudio Member Join Date: Mar 2004 Location: Herefordshire	Hi Fin, The Dac, clock, output stage and various power supplies are on a long double sided board across the back. There's no ground plane unlike the processing board, just traces. I'm interested in why your'e interested! Simon

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