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TDA1541 one the most important parts produced by Philips
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MayDac, a TDA1541A-based D/A-converter.
This project is almost finished, but I’ll put up all info on the build and pictures as soon as possible.
Based on:
TDA1541A
SAA7220P/B
0,3ppm 11.2896Mhz TXCO
OPA604 (have OPA627 and AD797 on the way)
ECC86 tube
This is how the DAC-PCB looks right now.
It started like this (some of the pictures you have to click on to view the whole picture)
Mayday DIY Blogg
MayDac, a TDA1541A-based D/A-converter. | Mayday DIY Blogg http://maydaydiy.wordpress.com/maydac-a-tda1541a-based-da-converter/
1 of 47 4/12/2012 5:44 PM
Then it got more and more populated
MayDac, a TDA1541A-based D/A-converter. | Mayday DIY Blogg http://maydaydiy.wordpress.com/maydac-a-tda1541a-based-da-converter/
2 of 47 4/12/2012 5:44 PM
MayDac, a TDA1541A-based D/A-converter. | Mayday DIY Blogg http://maydaydiy.wordpress.com/maydac-a-tda1541a-based-da-converter/
3 of 47 4/12/2012 5:44 PM
MayDac, a TDA1541A-based D/A-converter. | Mayday DIY Blogg http://maydaydiy.wordpress.com/maydac-a-tda1541a-based-da-converter/
4 of 47 4/12/2012 5:44 PM
MayDac, a TDA1541A-based D/A-converter. | Mayday DIY Blogg http://maydaydiy.wordpress.com/maydac-a-tda1541a-based-da-converter/
5 of 47 4/12/2012 5:44 PM
MayDac, a TDA1541A-based D/A-converter. | Mayday DIY Blogg http://maydaydiy.wordpress.com/maydac-a-tda1541a-based-da-converter/
6 of 47 4/12/2012 5:44 PM
TCXO
MayDac, a TDA1541A-based D/A-converter. | Mayday DIY Blogg http://maydaydiy.wordpress.com/maydac-a-tda1541a-based-da-converter/
7 of 47 4/12/2012 5:44 PM
TCXO and homemade socket
MayDac, a TDA1541A-based D/A-converter. | Mayday DIY Blogg http://maydaydiy.wordpress.com/maydac-a-tda1541a-based-da-converter/
8 of 47 4/12/2012 5:44 PM
Enclosure, used to be a tube preamp
MayDac, a TDA1541A-based D/A-converter. | Mayday DIY Blogg http://maydaydiy.wordpress.com/maydac-a-tda1541a-based-da-converter/
9 of 47 4/12/2012 5:44 PM
Copper wall that will separate the transformer from the rest of the DAC
Custom wound transformer from Toroidy.pl
Mounted the PCB in the enclosure and set the 7 voltage regulators
MayDac, a TDA1541A-based D/A-converter. | Mayday DIY Blogg http://maydaydiy.wordpress.com/maydac-a-tda1541a-based-da-converter/
10 of 47 4/12/2012 5:44 PM
Toroid will be installed further from the PCB with the copperwall between them.
2012-03-10
Done some work on the enclosure.
MayDac, a TDA1541A-based D/A-converter. | Mayday DIY Blogg http://maydaydiy.wordpress.com/maydac-a-tda1541a-based-da-converter/
11 of 47 4/12/2012 5:44 PM
Made crude angles to mount ECC86 horizontally.
MayDac, a TDA1541A-based D/A-converter. | Mayday DIY Blogg http://maydaydiy.wordpress.com/maydac-a-tda1541a-based-da-converter/
12 of 47 4/12/2012 5:44 PM
MayDac, a TDA1541A-based D/A-converter. | Mayday DIY Blogg http://maydaydiy.wordpress.com/maydac-a-tda1541a-based-da-converter/
13 of 47 4/12/2012 5:44 PM
Braided 4×0,6mm silverwire in teflontubing for internal analog wiring.
MayDac, a TDA1541A-based D/A-converter. | Mayday DIY Blogg http://maydaydiy.wordpress.com/maydac-a-tda1541a-based-da-converter/
14 of 47 4/12/2012 5:44 PM
Done! Waiting for 75ohm digital cable for the digital signal.
MayDac, a TDA1541A-based D/A-converter. | Mayday DIY Blogg http://maydaydiy.wordpress.com/maydac-a-tda1541a-based-da-converter/
15 of 47 4/12/2012 5:44 PM
Changed from RCA to BNC for digital signal
75ohm 4mm diameter coaxial cable for internal wiring of the digital signal.
In place and screwed to the PCB, but not yet soldered in the other end.
MayDac, a TDA1541A-based D/A-converter. | Mayday DIY Blogg http://maydaydiy.wordpress.com/maydac-a-tda1541a-based-da-converter/
16 of 47 4/12/2012 5:44 PM
All internal wiring apart from the wires from the transformer is now in place.
MayDac, a TDA1541A-based D/A-converter. | Mayday DIY Blogg http://maydaydiy.wordpress.com/maydac-a-tda1541a-based-da-converter/
17 of 47 4/12/2012 5:44 PM
This how I’ll make the secondaries longer and also prefent shafing against the copper wall.
MayDac, a TDA1541A-based D/A-converter. | Mayday DIY Blogg http://maydaydiy.wordpress.com/maydac-a-tda1541a-based-da-converter/
18 of 47 4/12/2012 5:44 PM
Got the philips ECC86 that eventually will be the outputstage in this DAC via passive I/V
MayDac, a TDA1541A-based D/A-converter. | Mayday DIY Blogg http://maydaydiy.wordpress.com/maydac-a-tda1541a-based-da-converter/
19 of 47 4/12/2012 5:44 PM
2012-03-16
Started on the ECC86 output today.
PS cap(4700uF), resistor, 2SK170 via 100R trimpot to ECC86 plates.
MayDac, a TDA1541A-based D/A-converter. | Mayday DIY Blogg http://maydaydiy.wordpress.com/maydac-a-tda1541a-based-da-converter/
20 of 47 4/12/2012 5:44 PM
2,2uF output cap and 100Kohm resistor between out and ground.
MayDac, a TDA1541A-based D/A-converter. | Mayday DIY Blogg http://maydaydiy.wordpress.com/maydac-a-tda1541a-based-da-converter/
21 of 47 4/12/2012 5:44 PM
MayDac, a TDA1541A-based D/A-converter. | Mayday DIY Blogg http://maydaydiy.wordpress.com/maydac-a-tda1541a-based-da-converter/
22 of 47 4/12/2012 5:44 PM
MayDac, a TDA1541A-based D/A-converter. | Mayday DIY Blogg http://maydaydiy.wordpress.com/maydac-a-tda1541a-based-da-converter/
23 of 47 4/12/2012 5:44 PM
MayDac, a TDA1541A-based D/A-converter. | Mayday DIY Blogg http://maydaydiy.wordpress.com/maydac-a-tda1541a-based-da-converter/
24 of 47 4/12/2012 5:44 PM
The free legs of the caps is where I’ll connect the signal from pin3(source) of the 2SK170′s
MayDac, a TDA1541A-based D/A-converter. | Mayday DIY Blogg http://maydaydiy.wordpress.com/maydac-a-tda1541a-based-da-converter/
25 of 47 4/12/2012 5:44 PM
Temporary mounted shielded tubesocket to get a view of the layout
2012-03-17
Re-worked the layout of the MayDac. Thanks for the advice Lovan and reVintage!!
MayDac, a TDA1541A-based D/A-converter. | Mayday DIY Blogg http://maydaydiy.wordpress.com/maydac-a-tda1541a-based-da-converter/
26 of 47 4/12/2012 5:44 PM
MayDac, a TDA1541A-based D/A-converter. | Mayday DIY Blogg http://maydaydiy.wordpress.com/maydac-a-tda1541a-based-da-converter/
27 of 47 4/12/2012 5:44 PM
New digital wiring in place.
MayDac, a TDA1541A-based D/A-converter. | Mayday DIY Blogg http://maydaydiy.wordpress.com/maydac-a-tda1541a-based-da-converter/
28 of 47 4/12/2012 5:44 PM
2012-03-19
Did some work on the ECC86 output and drilled some ventilation for the top of the chassies.
MayDac, a TDA1541A-based D/A-converter. | Mayday DIY Blogg http://maydaydiy.wordpress.com/maydac-a-tda1541a-based-da-converter/
29 of 47 4/12/2012 5:44 PM
MayDac, a TDA1541A-based D/A-converter. | Mayday DIY Blogg http://maydaydiy.wordpress.com/maydac-a-tda1541a-based-da-converter/
30 of 47 4/12/2012 5:44 PM
2012-03-20
Got some soldering done on the tube output.
Cathode resistors in place and set to 68R to begin with.
MayDac, a TDA1541A-based D/A-converter. | Mayday DIY Blogg http://maydaydiy.wordpress.com/maydac-a-tda1541a-based-da-converter/
31 of 47 4/12/2012 5:44 PM
47nF and 47R in parallell to be put between gnd and signal in to grid.
2012-03-21
Front and sides in Oak arrived today
MayDac, a TDA1541A-based D/A-converter. | Mayday DIY Blogg http://maydaydiy.wordpress.com/maydac-a-tda1541a-based-da-converter/
32 of 47 4/12/2012 5:44 PM
Made a gnd point for signalgnd among other things.
2012-03-25
Not much left to do on the tube output.
MayDac, a TDA1541A-based D/A-converter. | Mayday DIY Blogg http://maydaydiy.wordpress.com/maydac-a-tda1541a-based-da-converter/
33 of 47 4/12/2012 5:44 PM
Soldered connectors for signal to grid, wires for heaters and wires to cathode resistors.
2012-03-27
Done some internal wiring using silver wire. Also made ground points for the 47nF/47R-filter that comes after
the I/V-resistors.
MayDac, a TDA1541A-based D/A-converter. | Mayday DIY Blogg http://maydaydiy.wordpress.com/maydac-a-tda1541a-based-da-converter/
34 of 47 4/12/2012 5:44 PM
2012-03-29
Tube output buffer is almost done. Good because I have two Philips NOS ECC86 waiting to be used(one is to
change tubes when the first one has lived it’s life)
MayDac, a TDA1541A-based D/A-converter. | Mayday DIY Blogg http://maydaydiy.wordpress.com/maydac-a-tda1541a-based-da-converter/
35 of 47 4/12/2012 5:44 PM
Wires going off picture is for heater, they will be twisted and soldered to chassis connector.
PS for B+
Purple wires are to be soldered to ECC86 plates.
MayDac, a TDA1541A-based D/A-converter. | Mayday DIY Blogg http://maydaydiy.wordpress.com/maydac-a-tda1541a-based-da-converter/
36 of 47 4/12/2012 5:44 PM
2012-03-30
Finished the digital interconnect for this DAC.
Put in all the IC’s (will run it with IC’s before I run it with the ECC86 Tube output buffer.
MayDac, a TDA1541A-based D/A-converter. | Mayday DIY Blogg http://maydaydiy.wordpress.com/maydac-a-tda1541a-based-da-converter/
37 of 47 4/12/2012 5:44 PM
At first power-up….nothing. The 500mA Fuse I used wasn’t enough. Switched it to a 1A Fast blow fuse, and now
it works fine.
To early to really comment on sound quality, but after just 20min listening I can say that I’m not dissapointed
2012-04-02
Got I/V-resistors from Hificollective today.
Amtrans AMRG and Holco H2
Also recieved a 4-pin connector so I can connect both wallwarts in the PS for the ECC86 tube output to one
connector.
MayDac, a TDA1541A-based D/A-converter. | Mayday DIY Blogg http://maydaydiy.wordpress.com/maydac-a-tda1541a-based-da-converter/
38 of 47 4/12/2012 5:44 PM
2012-04-06
I recieved the matched PIO’s for the tube output yesterday.
MayDac, a TDA1541A-based D/A-converter. | Mayday DIY Blogg http://maydaydiy.wordpress.com/maydac-a-tda1541a-based-da-converter/
39 of 47 4/12/2012 5:44 PM
Did some work on putting the ECC86 tube output in to the DAC box today. Will continue during the weekend.
2012-04-07
Got some more work done on the tube output.
MayDac, a TDA1541A-based D/A-converter. | Mayday DIY Blogg http://maydaydiy.wordpress.com/maydac-a-tda1541a-based-da-converter/
40 of 47 4/12/2012 5:44 PM
2012-04-08
47R Amtrans AMRG I/V-resistors with 47R/47nF-filter soldered to them. Wire that’ll go to signalgnd is also
soldered. Left to do on this part of the build is to solder wires from I/V-resistors to signal out from the
TDA1541A, and to solder wires from I/V-resistors to ECC86 grids(with gridstoppers between).
MayDac, a TDA1541A-based D/A-converter. | Mayday DIY Blogg http://maydaydiy.wordpress.com/maydac-a-tda1541a-based-da-converter/
41 of 47 4/12/2012 5:44 PM
2012-04-09
Got some more work done on the tube ooutput. Also I connected the separate PS for the tube output to one
4-pin connector. And finally a first idea on how to place the I/V-resistors and filter.
MayDac, a TDA1541A-based D/A-converter. | Mayday DIY Blogg http://maydaydiy.wordpress.com/maydac-a-tda1541a-based-da-converter/
42 of 47 4/12/2012 5:44 PM
MayDac, a TDA1541A-based D/A-converter. | Mayday DIY Blogg http://maydaydiy.wordpress.com/maydac-a-tda1541a-based-da-converter/
43 of 47 4/12/2012 5:44 PM
2012-04-10 The Tube output is playing!! And playing very well I might add
I had to correct an error I’d made with the I/V-resistors
And now it plays music like no other DAC I’ve heard
MayDac, a TDA1541A-based D/A-converter. | Mayday DIY Blogg http://maydaydiy.wordpress.com/maydac-a-tda1541a-based-da-converter/
44 of 47 4/12/2012 5:44 PM
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45 of 47 4/12/2012 5:44 PM
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That’s all for today, stay tuned!
/Mayday
MayDac, a TDA1541A-based D/A-converter. | Mayday DIY Blogg http://maydaydiy.wordpress.com/maydac-a-tda1541a-based-da-converter/
46 of 47 4/12/2012 5:44 PM
Mayday DIY Blogg
Theme: Twenty Ten Blog at WordPress.com.
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