From TDA1540 to TDA1541

[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?

[poynton]

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

[D.A.R.R.Y.L.]

Then I will not learn.
So not an option.

[JeroenR]

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.

[D.A.R.R.Y.L.]

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?

[D.A.R.R.Y.L.]

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?

[D.A.R.R.Y.L.]

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

[D.A.R.R.Y.L.]

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 0,01µF
-removed the tda1540's
-put in TDA1541A
-replaced decoupling caps in output stage by 0,22µF 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.

[D.A.R.R.Y.L.]

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?

[D.A.R.R.Y.L.]