From TDA1540 to TDA1541 - diyAudio
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Old 27th April 2006, 01:15 AM   #1
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Default From TDA1540 to TDA1541

Hi all,
I have some old Philips players like the 304 and the 150.
I use the 150 for testing mods. Already did the opamps, replaced output caps with paper/oil, non-os (removed saa7030 completely).
Now I want to put in an tda1541.
Any tips?
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Old 27th April 2006, 09:32 AM   #2
poynton is offline poynton  United Kingdom
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Default Re: From TDA1540 to TDA1541

Quote:
Originally posted by D.A.R.R.Y.L.
Hi all,
I have some old Philips players like the 304 and the 150.
I use the 150 for testing mods. Already did the opamps, replaced output caps with paper/oil, non-os (removed saa7030 completely).
Now I want to put in an tda1541.
Any tips?
hi

buy a cd160

Andy
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Old 27th April 2006, 12:29 PM   #3
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Then I will not learn.
So not an option.
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Old 27th April 2006, 02:00 PM   #4
JeroenR is offline JeroenR  Netherlands
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Quote:
Originally posted by D.A.R.R.Y.L.
Then I will not learn.
So not an option.

Check the "remove saa7030" thread. It is explained there.

If you throw away the tda1540's, please let me know.
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Old 27th April 2006, 02:37 PM   #5
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SAA7000 ---> TDA1541A
DLCF 13 ---> DATA_L 3
DRCF 15 ---> DATA_R 4
CLCF 14 ---> BCK 2
STR1 12 ---> LE 1

Pin 27, OB/TWC, must be connected to -5v placing the TDA1541A in simultaneous L and R data mode.

But in my player I have -5, +5 and -17volt.
I saw -17 volt is maximum for the VDD2 pin on the TDA1541.
Will it harm the tda1541? Or should I put a resistor in series to reduce voltage?
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Old 27th April 2006, 02:38 PM   #6
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PS
What is best grounding principle for tda1541 on thos 14 decoupling pins? Any low value cap will do? And can I ground them together in one groundpoint?
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Old 28th April 2006, 12:59 AM   #7
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Done!!
I made a wonderful piece of art inside the cd-150 (pic will follow shortly). But it works like a charm. The difference is quit CLEAR (highs are finally there) imaging is very nice.
Will listen to it more in depth tomorrow.

Regards and thanks for the support,
Ramon

PS I used decoupling smd caps from an old cd-471
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Old 28th April 2006, 12:55 PM   #8
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Have been listening to some heavy duty classical music (Mahler 5, Dvorak celloconcert, Beethoven Eroica).
Oh my god!!! This cd-150 kicks ***.
(And I know (my reference) good, due to my marantz cd-7)

Mods so far:
-removed saa7030 --> non-os
-put in ad826 opamps
-replace powercaps with elna silmic and bypass with ero 0,01F
-removed the tda1540's
-put in TDA1541A
-replaced decoupling caps in output stage by 0,22F Paper/Oil.
(low value due to high input impedance on amplifier side --> lucky me!!)

All this stuff came from defective Philps players --> so just recycling.
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Old 28th April 2006, 12:59 PM   #9
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Waiting for Kwak Clock 7 parts from farnell.
And want to replace stock rca's and upgrade internal cabling and reinforce casing.
Also add shielding to ic's with copper plating.

Man, I love this old school diy.

PS Pic of tda1541 contraption will follow shortly.

Only wish I would understand the basics of designing your own I/V output stage.

PS2 I am feeding the VDD2 on the TDA1541A with -17,5 volt (had nothing else in the player, and the voltage divider option I have yet to master). Will this kill my tda1541A?
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Old 28th April 2006, 01:37 PM   #10
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Click the image to open in full size. Click the image to open in full size.
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