Installing digital out - diy

jsmccray · 24th November 2006, 12:30 PM

Hey All,

I have a Sony XA20-es, US version. It has a toslink, and I was wondering if it might be possible to make a digital out, RCA version - easily. I've taken this thing apart before and added an IEC power input, and added extra weights to the inside. I can solder, take some of the boards out, and am not afraid to go in depth with this, I'm just not sure what to do, and if it is even possible. Is this something where I can just splice some wires to a new RCA I can install to the back of the transport, or is it more complicated than that - something that should be left to someone with more experience?

Thanks,

jake

lucpes · 24th November 2006, 03:02 PM

Quote:

Originally posted by jsmccray

Is this something where I can just splice some wires to a new RCA I can install to the back of the transport, or is it more complicated than that - something that should be left to someone with more experience?

Hi, here's a variant I saved from a thread here. Based on the discussions there I'd say this is the best... take the signal from the input of the toslink piece inside and run it through this circuit.

gfiandy · 24th November 2006, 09:13 PM

You need to be a bit carefull with the circuit posted above, the SAA7220 which it is designed for has a high current driver for this output. This output is desinged to drive the low impedance required for SPDIF 75R terminated signals. However the sony may not have this it might just be an ordinary digital ouput designed to drive a logic input (Such as is used on the input to a TOSLINK transmitter). If this is the case you could burn out the driver in the output of the sony chip.

I would buffer the signal with a 74HCU04 chip (or buffer chip of your choice) and split the 158R resistor into two resistors in parrallel (try to get a value as close to 316R as you can) using two of the HCU04 outputs. This will give you enough current drive without risk of buring out the SONY chip set.

Regards,
Andrew

jsmccray · 25th November 2006, 02:25 PM

Thanks guys!

Unfortunately, this is quite over my head

At least I know now - I'll send it to someone in town!

Best,

jake

zanash · 29th November 2006, 08:11 AM

This can be easy .......

The toslink out put should have three pins one is voltage, one dig signal and one dig ground ....

A quick and dirty method is to locate ground ...thats easy ....so you have a choice of the other two as dig sg. trace back each the dig sg will have no other connections and should go back to the chip. the voltage pin track will have all manner of other connections as it goes back to the psu including caps and resistors.

I've used this method on 5 or six units now with total sucsees....contact me if you need more info.

jsmccray · 29th November 2006, 12:03 PM

Excellent!

so are you saying that I can use the voltage as one of the inputs for the RCA, and the dig sig. as the other input of the RCA? I'm not sure if that is what you are saying, but I'm guessing at this point. I'd email you, but I'm still new so I'm under monderation at this point.

Thanks,

jake

zanash · 29th November 2006, 12:47 PM

no

its ground and digital signal that you need

xrcd24bit · 6th December 2006, 07:09 AM

I use the attached circuit for my Denon CD player. I took the digital signal from the optical output. The 5V supply is also got from the optical output

jsmccray · 6th December 2006, 12:18 PM

I used the method of splicing from the Toslink outputs, and it has worked famously! No problem at all, I'm now going continue modding. Where in the US would you suggest I buy Schottky's and Os-Con caps, and the other things?

Thanks for everyone's help!

jake

xrcd24bit · 7th December 2006, 06:15 AM

Re-post the circuit

24th November 2006, 12:30 PM	#1
jsmccray diyAudio Member Join Date: May 2004 Location: Washington, D.C.	Installing digital out - diy Hey All, I have a Sony XA20-es, US version. It has a toslink, and I was wondering if it might be possible to make a digital out, RCA version - easily. I've taken this thing apart before and added an IEC power input, and added extra weights to the inside. I can solder, take some of the boards out, and am not afraid to go in depth with this, I'm just not sure what to do, and if it is even possible. Is this something where I can just splice some wires to a new RCA I can install to the back of the transport, or is it more complicated than that - something that should be left to someone with more experience? Thanks, jake

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24th November 2006, 09:13 PM	#3
gfiandy Audio Engineer diyAudio Member Join Date: Jul 2003 Location: Cambridge UK	You need to be a bit carefull with the circuit posted above, the SAA7220 which it is designed for has a high current driver for this output. This output is desinged to drive the low impedance required for SPDIF 75R terminated signals. However the sony may not have this it might just be an ordinary digital ouput designed to drive a logic input (Such as is used on the input to a TOSLINK transmitter). If this is the case you could burn out the driver in the output of the sony chip. I would buffer the signal with a 74HCU04 chip (or buffer chip of your choice) and split the 158R resistor into two resistors in parrallel (try to get a value as close to 316R as you can) using two of the HCU04 outputs. This will give you enough current drive without risk of buring out the SONY chip set. Regards, Andrew

25th November 2006, 02:25 PM	#4
jsmccray diyAudio Member Join Date: May 2004 Location: Washington, D.C.	Thanks guys! Unfortunately, this is quite over my head At least I know now - I'll send it to someone in town! Best, jake

29th November 2006, 08:11 AM	#5
zanash diyAudio Member Join Date: Feb 2005 Location: Notts	This can be easy ....... The toslink out put should have three pins one is voltage, one dig signal and one dig ground .... A quick and dirty method is to locate ground ...thats easy ....so you have a choice of the other two as dig sg. trace back each the dig sg will have no other connections and should go back to the chip. the voltage pin track will have all manner of other connections as it goes back to the psu including caps and resistors. I've used this method on 5 or six units now with total sucsees....contact me if you need more info.

29th November 2006, 12:03 PM	#6
jsmccray diyAudio Member Join Date: May 2004 Location: Washington, D.C.	Excellent! so are you saying that I can use the voltage as one of the inputs for the RCA, and the dig sig. as the other input of the RCA? I'm not sure if that is what you are saying, but I'm guessing at this point. I'd email you, but I'm still new so I'm under monderation at this point. Thanks, jake

29th November 2006, 12:47 PM	#7
zanash diyAudio Member Join Date: Feb 2005 Location: Notts	no its ground and digital signal that you need

6th December 2006, 07:09 AM	#8
xrcd24bit diyAudio Member Join Date: May 2005 Location: Hong Kong	I use the attached circuit for my Denon CD player. I took the digital signal from the optical output. The 5V supply is also got from the optical output

6th December 2006, 12:18 PM	#9
jsmccray diyAudio Member Join Date: May 2004 Location: Washington, D.C.	I used the method of splicing from the Toslink outputs, and it has worked famously! No problem at all, I'm now going continue modding. Where in the US would you suggest I buy Schottky's and Os-Con caps, and the other things? Thanks for everyone's help! jake

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