TDA1541A S1 come back!!! - Page 4

Peter Daniel · 8th May 2003, 02:29 PM

So maybe it's a good idea to remove them completely?

hifi · 8th May 2003, 02:39 PM

well you could but if you disconect the dac while on you will here some hevy pops when conecting it again...

/micke

Peter Daniel · 8th May 2003, 03:02 PM

I guess one way to avoid it would be installing relays that short the output to ground when switched off and providing delay when switching on.

fedde · 8th May 2003, 03:58 PM

That would work. Or you use a large resistor 100-500 k. But you get two problems then:
- the DC of the unconnected output is not exactly zero (with 100 k the DC is quite small). Well, it is wise anyway to turn down the volume of the amp while connecting...
- you get some extra resistor noise. I think this is not a big problem

Fedde

apassgear · 13th May 2003, 10:04 PM

Here is a Pic of the main board before changing the PSU caps.

To the right both Jung regs for the analog section.

apassgear · 13th May 2003, 10:24 PM

After this long absence let me summarize what I've done to the CDP.

After changing all decoupling caps (all bypassed with small film caps) I changed all the PSU caps, taking Kuei's advice.

Al caps were "NOS" Panasonic HFS (even though I do have HFQ's) with the exception of the 6800u located before the +5V reg which was replaced by two regular ELNAs 4700u 50V for a measured 10Ku.

Other changes made were the replacement of 2 resitors at each of the I/V Opamps from Roderstain to CGW non magnetics MF.

Also I added the 3.3u caps at the MSB (Panasonic HFS). Plus some ferrite beads to the output of the Jung regs and a big split ferrite to all wires coming and going between the servo and main boards.

apassgear · 14th May 2003, 01:35 AM

I have logged about 8/10 hours of break-in so still not fully done plus sone 15 hours on.

My impresions so far is that is very clean sounding, deep and quite wide sundstage with lots of detail, concert music puts a huge crowd behind the performers nice bass and cleaner highs far exceeding what I have heard up to date (not much though). In relation to my Delta Sigma (DS) wins in all counts by an ample marging but two.

Dynamics and HF drama or energy.

To follow my quest and see what much is available I am preparing an Opamp I/V to replace my old stage.

The new one will be done with LM6181 (single LM6182) using a standard schem.

I have also ordered OPA660 to try Kuei's proposal.

In the other hand I'm also finishing a separate PSU (actualy 2) to feed the DAC with the three voltages needed.

Some pics of the PSU.

Rarkov · 17th July 2003, 12:43 PM

I've just started building my TDA1543 design using Peter Daniels schematic on post #14. I am using a 33uF Blackgate N, SCR 10uF and Hovland 0.022uF for bypassing. All resistors are Vishay and both 4.7uF caps are Blackgate N types! This should be nice!

Thanks for the design - I'll let you know how it goes!

Gaz

Rarkov · 18th July 2003, 09:10 PM

Pics of my CD-PRO2 PSU and TDA1543 DAC / PSU are here...
http://www.diyaudio.com/forums/showt...535#post208535

Enjoy!
Gaz

8th May 2003, 02:29 PM	#31
Peter Daniel diyAudio Member Join Date: Jul 2002 Location: Toronto, Canada	So maybe it's a good idea to remove them completely? __________________ www.audiosector.com “Do something really well. See how much time it takes. It might be a product, a work of art, who knows? Then give it away cheaply, just because you feel that it should not cost so much, even if it took a lot of time and expensive materials to make it.” - JC

8th May 2003, 03:02 PM	#33
Peter Daniel diyAudio Member Join Date: Jul 2002 Location: Toronto, Canada	I guess one way to avoid it would be installing relays that short the output to ground when switched off and providing delay when switching on. __________________ www.audiosector.com “Do something really well. See how much time it takes. It might be a product, a work of art, who knows? Then give it away cheaply, just because you feel that it should not cost so much, even if it took a lot of time and expensive materials to make it.” - JC

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8th May 2003, 02:39 PM	#32
hifi diyAudio Member Join Date: Mar 2001 Location: sweden	well you could but if you disconect the dac while on you will here some hevy pops when conecting it again... /micke

8th May 2003, 03:58 PM	#34
fedde diyAudio Member Join Date: Jul 2002 Location: Eindhoven, the Netherlands	That would work. Or you use a large resistor 100-500 k. But you get two problems then: - the DC of the unconnected output is not exactly zero (with 100 k the DC is quite small). Well, it is wise anyway to turn down the volume of the amp while connecting... - you get some extra resistor noise. I think this is not a big problem Fedde

13th May 2003, 10:24 PM	#36
apassgear diyAudio Member Join Date: Nov 2002 Location: Viña del Mar, Torreon	After this long absence let me summarize what I've done to the CDP. After changing all decoupling caps (all bypassed with small film caps) I changed all the PSU caps, taking Kuei's advice. Al caps were "NOS" Panasonic HFS (even though I do have HFQ's) with the exception of the 6800u located before the +5V reg which was replaced by two regular ELNAs 4700u 50V for a measured 10Ku. Other changes made were the replacement of 2 resitors at each of the I/V Opamps from Roderstain to CGW non magnetics MF. Also I added the 3.3u caps at the MSB (Panasonic HFS). Plus some ferrite beads to the output of the Jung regs and a big split ferrite to all wires coming and going between the servo and main boards.

17th July 2003, 12:43 PM	#38
Rarkov diyAudio Member Join Date: Aug 2002 Location: North East, UK	I've just started building my TDA1543 design using Peter Daniels schematic on post #14. I am using a 33uF Blackgate N, SCR 10uF and Hovland 0.022uF for bypassing. All resistors are Vishay and both 4.7uF caps are Blackgate N types! This should be nice! Thanks for the design - I'll let you know how it goes! Gaz

18th July 2003, 09:10 PM	#39
Rarkov diyAudio Member Join Date: Aug 2002 Location: North East, UK	Pics of my CD-PRO2 PSU and TDA1543 DAC / PSU are here... http://www.diyaudio.com/forums/showt...535#post208535 Enjoy! Gaz

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