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Old 7th September 2005, 01:31 PM   #1
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Default TDA1540 analogue stage

Recently & bought nicely sounding player Marantz cd-74 with cdm-1 ant tda1540.Tda1540 has 3 power supplies:+5V,-5V,17V.& want to do separate power supply for analogue stage.Do all suplies are common for digital and analogue parts and what is the best way to connect them?
Analogue filter-I/U conversion using transformer and buffer with AD797.Maybe somebody could suggest the best connection?
Couldn't find Marantz-cd74 service manual or cdm-1 schematics.Could anybody help?
Thanks for suggestions.Sorry for my english.
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Old 9th September 2005, 12:51 AM   #2
phimor is offline phimor  Australia
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Hi, I don’t know the 74, but the 73 is a Philips CD300. If you can identify more of the chips it would be a help (Eg SoPhi board or saa7020). All of these machines usually have 3 boards; PS, transport servo and decoder/analogue.

The power distribution is usually through the servo board. But you should really use the search function, there are lots of posts on the early machines and get a set of Ultranalogue’s manuals on CD, all Philips, but the Marantz from that period are clones.

Cheers

Philippe
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Old 9th September 2005, 08:01 AM   #3
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Hi,
Marantz cd-74 is Philips cd-304 clone,uses SAA70x0 and have 3 boards.TDA1540 datasheet isn't very informative but & think there are no separate analogue power supply.Maybe somebody experimented with separate power supply?
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