Critique please: Analogue -> Digital (TOS-LINK)

underwurlde · 2nd August 2012, 09:49 AM

Circuit I've quickly knocked up below hopefully takes stereo Audio line-level analogue input and converts it to a digital S/PDIF optical TOS-LINK output, thus matching what some CD players provide such as the Marantz C63/CD67 etc.

I would greatly appreciate any comments / recommendations for my circuit below:

Thanks!

Andy

gfiandy · 5th August 2012, 03:58 PM

I am not completely sure but I don't think you can use Schmitt trigger input parts for a CMOS oscillator. The oscillator requires a bit of positive feedback to build up the oscillation and the SI think Schmitt trigger will prevent this.

Toslink parts use a lot of current in big gulps a 10uF or 100uF cap after you filter inductor would be wise.

You could get a bit of a thump from the input with no resistor to ground before the input capacitors, it also helps to reduce static strike damage.

Hope it works out, I haven't checked the IC configuration.

Regards,
Andrew

underwurlde · 19th August 2012, 04:54 PM

Thank you! (Work in progress of course).

Andy

for ref only: Is there a DIY ADC project?

2nd August 2012, 09:49 AM	#1
underwurlde diyAudio Member Join Date: Feb 2005 Location: S.England	Critique please: Analogue -> Digital (TOS-LINK) Circuit I've quickly knocked up below hopefully takes stereo Audio line-level analogue input and converts it to a digital S/PDIF optical TOS-LINK output, thus matching what some CD players provide such as the Marantz C63/CD67 etc. I would greatly appreciate any comments / recommendations for my circuit below: Thanks! Andy

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5th August 2012, 03:58 PM	#2
gfiandy Audio Engineer diyAudio Member Join Date: Jul 2003 Location: Cambridge UK	I am not completely sure but I don't think you can use Schmitt trigger input parts for a CMOS oscillator. The oscillator requires a bit of positive feedback to build up the oscillation and the SI think Schmitt trigger will prevent this. Toslink parts use a lot of current in big gulps a 10uF or 100uF cap after you filter inductor would be wise. You could get a bit of a thump from the input with no resistor to ground before the input capacitors, it also helps to reduce static strike damage. Hope it works out, I haven't checked the IC configuration. Regards, Andrew

19th August 2012, 04:54 PM	#3
underwurlde diyAudio Member Join Date: Feb 2005 Location: S.England	Thank you! (Work in progress of course). Andy for ref only: Is there a DIY ADC project?