TDA1540 analogue stage

dariusku · 7th September 2005, 12:31 PM

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.

phimor · 8th September 2005, 11:51 PM

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

dariusku · 9th September 2005, 07:01 AM

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?

7th September 2005, 12:31 PM	#1
dariusku diyAudio Member Join Date: Nov 2004 Location: Kaunas,LT	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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8th September 2005, 11:51 PM	#2
phimor diyAudio Member Join Date: Feb 2004 Location: Adelaide	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

9th September 2005, 07:01 AM	#3
dariusku diyAudio Member Join Date: Nov 2004 Location: Kaunas,LT	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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