My version of the TDA1541 Analog Metric DAC - diyAudio
Go Back   Home > Forums > Source & Line > Digital Line Level

Digital Line Level DACs, Digital Crossovers, Equalizers, etc.

Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Reply
 
Thread Tools Search this Thread
Old 13th November 2014, 07:46 AM   #1
diyAudio Member
 
freax's Avatar
 
Join Date: Sep 2007
Default My version of the TDA1541 Analog Metric DAC

Going to dump some photos here for the time being this is just a rough slap together of what components the final product might be using.

Extensive use of 0.022uF k73-15's and soon-to-arrive 22uF K73-16's.

Main rectifier Diodes will be Russian D7J's Germaniums from Russia. (If they don't blow up with this much capacitance.)

Two of the PSU caps are 6800uF 63v Panasonic TSU Series that I have had for some time now. I like lots and lots of Capacitance, I'm using the experience I've had with the previous TDA1543 DAC and the amount of capacitance there was 22,000uF. I also like the idea of using a higher voltage one than is necessary to reduce any potential micro-phonics in the front line of power supply filtering.

Main Transformer is an R-Core with the following windings:
1x 18v-0v-18v
3x 9v

Post-Regulator caps will/are going to be Elna Cerafine 100uF-470uF (Might also use 22uF K73 in an Adjustment capacitor arrangement, reasons: http://www.tnt-audio.com/clinica/reg..._noise2_e.html )
& Post-post Regulator caps (for RF/Noise filtering) will again be the low-value K73's

TDA1541 & SAA7220P/A are both 100% Genuine CDP pulls. (I want to see what the PCB sounds like when fully populated and then depopulate it according to my tastes, yes this means also fitting OPAMPS, you never know I might like the sound of them more than straight old Passive I/V conversion.)

TDA1541 Coupling caps are again, you guessed it, K73's though I might swap these out fairly often with different values and try other brands aswell.

TDA1541 Decoupling caps will be 0.470uF K73-16's if I can find some if I can't however I may get some thats slightly smaller in value. What is in there at the moment for first-test run purposes is 2x 0.022uF in parallel which makes 0.044uF. I've had great results with these in the TDA1543 DAC project I made a while ago.

Feed from a rear BNC to the board SPDIF will be RG-316 Coax.

Receiver chip is CS8412-CP.

I must say that this PCB is truly high quality with very very nice through-holes, but this does make it a mongrel to desolder if you need to.

Thats all I can share and be certian of for now. Welcome any suggestions.
Attached Images
File Type: jpg Picture 071s.jpg (282.7 KB, 364 views)
File Type: jpg Picture 072s.jpg (353.5 KB, 355 views)
File Type: jpg Picture 075s.jpg (376.8 KB, 342 views)
File Type: jpg Picture 076s.jpg (811.9 KB, 333 views)
File Type: jpg Picture 077s.jpg (323.8 KB, 314 views)
__________________
"It seems that perfection is reached not when there is nothing left to add, but when there is nothing left to take away" - Antoine de Saint Exupéry

Last edited by freax; 13th November 2014 at 11:11 AM.
  Reply With Quote
Old 13th November 2014, 11:26 AM   #2
diyAudio Member
 
freax's Avatar
 
Join Date: Sep 2007
Datasheet for the D7J Germanium Diode is in one of the attatched photos.
Attached Images
File Type: jpg $_57.JPG (155.8 KB, 122 views)
__________________
"It seems that perfection is reached not when there is nothing left to add, but when there is nothing left to take away" - Antoine de Saint Exupéry
  Reply With Quote
Old 13th November 2014, 12:01 PM   #3
esgigt is offline esgigt  Netherlands
diyAudio Member
 
Join Date: Dec 2013
What advantage do you expect from the Germanium diodes?

Unfortunately I do not know Russian, but looking at the datasheet, I think the diodes won't stand a chance with that kind of filter-capacitance...

@22.000uF the diodes ought to withstand a lot of "peak Amperes".

NB.: Keep in mind that the SAA7220 is a notorious source of noise on the power-supply line. Decoupling with only a resistor and a capacitor will not do (for best performance).

Last edited by esgigt; 13th November 2014 at 12:05 PM.
  Reply With Quote
Old 13th November 2014, 12:42 PM   #4
diyAudio Member
 
freax's Avatar
 
Join Date: Sep 2007
Quote:
Originally Posted by esgigt View Post
What advantage do you expect from the Germanium diodes?
Lower switching noise.

I see you're from the Netherlands. Nice. I used to have a friend who used to live there, nice internet speeds? He lives in Sweden now.

Quote:
Unfortunately I do not know Russian, but looking at the datasheet, I think the diodes won't stand a chance with that kind of filter-capacitance...
I reckon they would stand a chance, they're tough Ombre's, they're here to party and drink Vodka. I say I give them a shot at it.

I won't be using 22,000uF, the most that four of them will see is 6800uF or lower. if they blow at 6800uF I'll lower it.

Here is a translation that I've made tonight
Attached Images
File Type: png 20070429090501!Soviet_party.png (24.8 KB, 81 views)
File Type: jpg d7j datasheet-translated.jpg (238.3 KB, 69 views)
__________________
"It seems that perfection is reached not when there is nothing left to add, but when there is nothing left to take away" - Antoine de Saint Exupéry

Last edited by freax; 13th November 2014 at 12:53 PM.
  Reply With Quote
Old 13th November 2014, 01:02 PM   #5
esgigt is offline esgigt  Netherlands
diyAudio Member
 
Join Date: Dec 2013
Quote:
Originally Posted by freax View Post
Lower switching noise.
I'm afraid the noise generated by the SAA7220 is a multiple on the regulated PS-line. Is PS-regulation done by LM's or so? These device are very good at suppressing noise and so within the audio frequencies and a bit above, but not so good in the 1Mhz+ range (saa7220)... There you have to suppress noise using passive measures.

Quote:
Originally Posted by freax View Post
I see you're from the Netherlands. Nice. I used to have a friend who used to live there, nice internet speeds? He lives in Sweden now.
yes & yes.. Sweden seems to be a nice country too...
Quote:
Originally Posted by freax View Post
I reckon they would stand a chance, they're tough Ombre's, they're here to party and drink Vodka. I say I give them a shot at it.

I won't be using 22,000uF, the most that four of them will see is 6800uF or lower. if they blow at 6800uF I'll lower it.

Here is a translation that I've made tonight
OK, let's hope for the best... And thanks for the translation..
  Reply With Quote
Old 13th November 2014, 02:21 PM   #6
Stixx is offline Stixx  Germany
I am
diyAudio Member
 
Stixx's Avatar
 
Join Date: Sep 2003
Location: Southern Germany
The TDA chip looks fake to me...
__________________
www.original-ton.net
  Reply With Quote
Old 13th November 2014, 08:06 PM   #7
Green77 is offline Green77  Sweden
diyAudio Member
 
Join Date: May 2007
Location: MJOLBY
Hello
I'm building the same kit too. But i will stop after the tda1541a chip and go for a tube output stage. I also change a lot of components so it was a mistake to order a kit...i should have ordered a empty pcb insteed
regards //Daniel
  Reply With Quote
Old 13th November 2014, 11:21 PM   #8
diyAudio Member
 
freax's Avatar
 
Join Date: Sep 2007
Quote:
Originally Posted by esgigt View Post
I'm afraid the noise generated by the SAA7220 is a multiple on the regulated PS-line. Is PS-regulation done by LM's or so? These device are very good at suppressing noise and so within the audio frequencies and a bit above, but not so good in the 1Mhz+ range (saa7220)... There you have to suppress noise using passive measures.
Its... how should I put it... a visitor anyway.

I'm going to see what it sounds like and then remove it and the 74HC4040 from the circuit and put it back in and then remove it again. To make 100% Sure that I like it out of the circuit.

Yes I'm going to acquire 100% genuine LM317/LM337's over the next few years, only one LM317 which is on the Analog PSU circuit at the moment is 100% Genuine that I can vouch for, I'll add a picture of it to the end of this message.

The one in the pictures below isn't from eBay, I got it from a parts bin that was over 30 years old and was owned by my uncle who passed away.

I'll paste 'some' pictures of my TDA1541 NON-A in the next post.

Quote:
OK, let's hope for the best... And thanks for the translation..
No problems, hopefully it can be of some use to someone else who uses the germanium diodes.

I'm thinking that to get around the inrush current being a problem that we could use a soft start circuit. (IF it becomes a problem)
Attached Images
File Type: jpg Picture 001s.jpg (385.2 KB, 84 views)
File Type: jpg Picture 002s.jpg (367.0 KB, 55 views)
__________________
"It seems that perfection is reached not when there is nothing left to add, but when there is nothing left to take away" - Antoine de Saint Exupéry

Last edited by freax; 13th November 2014 at 11:29 PM.
  Reply With Quote
Old 13th November 2014, 11:35 PM   #9
diyAudio Member
 
freax's Avatar
 
Join Date: Sep 2007
Here are the pics of my TDA1541 NON-A

To add to its authenticity:
It came from a Marantz CD-65 Mark 1 which was made in 1986.
When I pulled it it was covered in dust.
The pits are nice and smooth and the surface looks non-sanded & non-painted.
The date code on the 1541 is H8618.
The power supply capacitors were made in ... H8534...
The SAA7220P/A has a date code of DGG8601M2Y

It sounds FANTASTIC!
Attached Images
File Type: jpg Picture 003s.jpg (277.6 KB, 48 views)
File Type: jpg Picture 004s.jpg (327.7 KB, 35 views)
File Type: jpg Picture 005s.jpg (365.5 KB, 38 views)
File Type: jpg Picture 006s.jpg (425.0 KB, 33 views)
File Type: jpg Picture 007s.jpg (306.9 KB, 26 views)
File Type: jpg Picture 008s.jpg (295.2 KB, 25 views)
File Type: jpg Picture 075s.jpg (376.8 KB, 37 views)
File Type: jpg Picture 076s.jpg (289.0 KB, 47 views)
File Type: jpg Picture 077s.jpg (285.9 KB, 26 views)
File Type: jpg Picture 078s.jpg (286.4 KB, 18 views)
__________________
"It seems that perfection is reached not when there is nothing left to add, but when there is nothing left to take away" - Antoine de Saint Exupéry

Last edited by freax; 13th November 2014 at 11:57 PM.
  Reply With Quote
Old 14th November 2014, 12:01 AM   #10
esgigt is offline esgigt  Netherlands
diyAudio Member
 
Join Date: Dec 2013
Quote:
Originally Posted by freax View Post
Here are the pics of my TDA1541 NON-A

To add to its authenticity:
It came from a Marantz CD-65 Mark 1 which was made in 1986.
When I pulled it it was covered in dust.
The pits are nice and smooth and the surface looks non-sanded & non-painted.
The date code on the 1541 is H8618.
The power supply capacitors were made in ... H8534...
The SAA7220P/A has a date code of DGG8601M2Y

It sounds FANTASTIC!
Looks good too..

The non-A is not necessarily less than an A... so no problem there

Give it some time to burn-in and then set up a good listening session.

There is one tiny difference between the A and the non-A : the non-A has an internal capacitor for the DEM-frequency, the A external (C19: 470p).

Last edited by esgigt; 14th November 2014 at 12:04 AM.
  Reply With Quote

Reply


Hide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Use and mods to Analog Metric SR50 Shunt Regulator druidaudio Power Supplies 24 3rd November 2014 11:15 PM
Analog Metric Softstart Board Nirvana5253 Power Supplies 7 29th March 2013 08:38 PM
Analog Metric 2A3 PP Kit x3me00 Tubes / Valves 0 8th August 2012 03:24 PM
FS: Analog Metric DAC TDA1541A S1 Amauta Swap Meet 3 13th July 2011 05:19 PM
Analog Metric grounded grid preamp kit sharpi31 Tubes / Valves 6 18th November 2008 08:59 PM


New To Site? Need Help?

All times are GMT. The time now is 06:49 AM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd.
Copyright ©1999-2014 diyAudio

Content Relevant URLs by vBSEO 3.3.2