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Question how to add a SPDIF output off a TDA1541a?
Question how to add a SPDIF output off a TDA1541a?
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Old 8th November 2018, 04:04 PM   #1
Badge is offline Badge  United States
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Default Question how to add a SPDIF output off a TDA1541a?

I dug out my first CD player I purchased late 1980's or early 1990's. It is a Phillips made - branded Magnavox player. It only had analog out. Can someone show me a circuit to add a SPDIF out with this limited info? Thanks
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Old 8th November 2018, 04:13 PM   #2
lcsaszar is offline lcsaszar  Hungary
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Have a look at the internals. Does it have a digital filter of typ SAA7220P/B? Then it is possible to copy the circuitry of another CD-player that has SPDIF output (just checked the Marantz CD-94 SM).
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Old 8th November 2018, 04:15 PM   #3
batteryman is offline batteryman  United Kingdom
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Pin 14 of the SAA7220 is the digital audio output. Below is the output used on a Marantz CD65 TDA1541 cd player.

Here is a suitable transformer:
https://media.digikey.com/pdf/Data%2...12_Rev2006.pdf
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File Type: jpg spdif out.jpg (22.7 KB, 60 views)
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Old 8th November 2018, 04:42 PM   #4
Badge is offline Badge  United States
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Thanks. I tried to find a schematic for my player with no luck. I will pop the top and look for a SAA7220. The higher price model of the same vintage had the SPDIF out.
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Old 8th November 2018, 05:00 PM   #5
batteryman is offline batteryman  United Kingdom
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Quote:
Originally Posted by Badge View Post
Thanks. I tried to find a schematic for my player with no luck. I will pop the top and look for a SAA7220. The higher price model of the same vintage had the SPDIF out.
Here is a useful list of CD players which shows the Magnavox models with a SAA7220

CD-Player-DAC-Transport-List
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Old 8th November 2018, 05:07 PM   #6
sq225917 is offline sq225917  United Kingdom
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Send a message via MSN to sq225917 Question how to add a SPDIF output off a TDA1541a?
Lampizator has loads of info on this, search his site
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Old 8th November 2018, 09:49 PM   #7
Badge is offline Badge  United States
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Yes, my unit has a SAA7220P/B chip. I will build that circuit posted off pin 14. Thanks for the info one and all.
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