Hi,
Thought you might be interested in these. The DAC is a TDA1543 based on a design posted by Peter Daniel...
Anyway, starting at pic 1/5...
This is the Main CD player's PSU. Closest is the 5V rail. In the middle is the 9V rail. The far end (top) has the negative supply. Notice, the 5V and 9V have snubbing caps and good filtering.
Gaz
Thought you might be interested in these. The DAC is a TDA1543 based on a design posted by Peter Daniel...
Anyway, starting at pic 1/5...
This is the Main CD player's PSU. Closest is the 5V rail. In the middle is the 9V rail. The far end (top) has the negative supply. Notice, the 5V and 9V have snubbing caps and good filtering.
Gaz
Attachments
)
Pic 3/5...
This is the TDA1543 DAC. One BG N 4.7uF cap is missing cause they messed up my order and are now out of stock...3 weeks to wait!!!
The resistors in the I/V stage are Vishays and three of the caps (red ones) are BG N. The large black one is an SCR 10uF and the yellow is (obviously) a Hovland (0.022uF). You may notice that the chip is missing - all in good time... 😉
Gaz
This is the TDA1543 DAC. One BG N 4.7uF cap is missing cause they messed up my order and are now out of stock...3 weeks to wait!!!
The resistors in the I/V stage are Vishays and three of the caps (red ones) are BG N. The large black one is an SCR 10uF and the yellow is (obviously) a Hovland (0.022uF). You may notice that the chip is missing - all in good time... 😉Gaz
Attachments
Pic 4/5...
I made all of the PCBs in one batch. I was using that Press 'n' Peel Iron-On stuff. It turns out that I had got them ALL the wrong way around...Undeterred (and not wanting to pay another £15 for new sheets of the stuff) I converted the TDA1543 into a SMD and the regulators on the PSUs were turned 180degs. Obviously the bridge rectifiers had to be rotated but most components were unaffected...Luckily!
Gaz
I made all of the PCBs in one batch. I was using that Press 'n' Peel Iron-On stuff. It turns out that I had got them ALL the wrong way around...Undeterred (and not wanting to pay another £15 for new sheets of the stuff) I converted the TDA1543 into a SMD and the regulators on the PSUs were turned 180degs. Obviously the bridge rectifiers had to be rotated but most components were unaffected...Luckily!
Gaz
Attachments
Bricolo:
Ordering the CD-PRO2 is next months expense! 😉 I will, no doubt, show you my results!
BrianGT:
I used the one at A simple but yet effective supply. It seems a bit weird for two reasons...Firstly, they go on about the importance on the 9V coming up AFTER the 5V but within 150mS - However, I don't see anything here to handle that...I'll see if it works or not. The other weird issue was the negative side...I did manage to simulate it here...
Gaz
Ordering the CD-PRO2 is next months expense! 😉 I will, no doubt, show you my results!
BrianGT:
I used the one at A simple but yet effective supply. It seems a bit weird for two reasons...Firstly, they go on about the importance on the 9V coming up AFTER the 5V but within 150mS - However, I don't see anything here to handle that...I'll see if it works or not. The other weird issue was the negative side...I did manage to simulate it here...
Gaz
Wow, that looks like some serious kit, what with all those exotic caps and all 😉
Great job, I can't wait to see the player finished.
What do you reckon the whole project will have cost by completion?
-Simon
Great job, I can't wait to see the player finished.
What do you reckon the whole project will have cost by completion?
-Simon
Rarkov said:Pic 3/5...
This is the TDA1543 DAC. One BG N 4.7uF cap is missing cause they messed up my order and are now out of stock...3 weeks to wait!!!
Gaz
Very nice and clean work Gaz. So next month we will have the power up ceremony, hope you share this experiance with us.
Since we can't see a schematic, don't know which is the SCR cap roll. In my opinion an SCR is a no-no on a source or line amp, even on the PSU so I will suggest, further down the road, to test different caps and compare.
Member
Joined 2002
Hi,
The DAC design is posted here by Peter Daniel: http://www.diyaudio.com/forums/showthread.php?postid=172294#post172294. The SCR 10uF, Hovland 0.022uF and 33uF BG N make up the DAC's decoupling trio!
JasonL:
The transformers are from RS WWW. If that link doesn't work, then try this...RS WWW and then follow links to Electronic | Transformers/Inductors/Ferrites | Toroidal | Min Encapsulated PCB Mount 115/320Vac Primary, Transformers
SimontY:
A quick break down follows:
PSU Components £110
DAC £1.50
DAC Components £55
CD-PRO2 £340
General (Wiring [Silver] etc etc) £20
Casing ?!!!!! (about £60 I'd guess)
TOTAL: £586.50
That's just a guess though.
apassgear:
Thanks for the advice. I'd like to try a 2.2uF Hovland (£17.40) or a 10uF Supersound (£5.50) and see if I can hear a difference. To be honest, I doubt I would be able to. I have burst my ear drum three times (twice as a baby - thanks to my brother shouting in my ear) and once when I was diving - so my hearing is OK but not brilliant. Have you heard of Supersound? Why don't you like SCRs? What about for decoupling?
BTW - I am not knocking anyone who can hear such minute differences as changing resistors or equipment platforms etc - but I'm damn glad I can't! Less to worry about! 😉 However - I do strive to get my equipment to perform to the best of my abilities!
Thanks for any advice!
Gaz
The DAC design is posted here by Peter Daniel: http://www.diyaudio.com/forums/showthread.php?postid=172294#post172294. The SCR 10uF, Hovland 0.022uF and 33uF BG N make up the DAC's decoupling trio!
JasonL:
The transformers are from RS WWW. If that link doesn't work, then try this...RS WWW and then follow links to Electronic | Transformers/Inductors/Ferrites | Toroidal | Min Encapsulated PCB Mount 115/320Vac Primary, Transformers
SimontY:
A quick break down follows:
PSU Components £110
DAC £1.50
DAC Components £55
CD-PRO2 £340
General (Wiring [Silver] etc etc) £20
Casing ?!!!!! (about £60 I'd guess)
TOTAL: £586.50
That's just a guess though.
apassgear:
Thanks for the advice. I'd like to try a 2.2uF Hovland (£17.40) or a 10uF Supersound (£5.50) and see if I can hear a difference. To be honest, I doubt I would be able to. I have burst my ear drum three times (twice as a baby - thanks to my brother shouting in my ear) and once when I was diving - so my hearing is OK but not brilliant. Have you heard of Supersound? Why don't you like SCRs? What about for decoupling?
BTW - I am not knocking anyone who can hear such minute differences as changing resistors or equipment platforms etc - but I'm damn glad I can't! Less to worry about! 😉 However - I do strive to get my equipment to perform to the best of my abilities!
Thanks for any advice!
Gaz
After a request to photograph my new multimeter and circuit surgery here are 5 few new pics...
Pic 6/10...
http://www.diyaudio.com/forums/showthread.php?postid=208845#post208845 catalogs a problem I was having with too high a voltage outputs. This has been solved by 7 series diodes. The following photo shows how I have organised them...
Gaz
Pic 6/10...
http://www.diyaudio.com/forums/showthread.php?postid=208845#post208845 catalogs a problem I was having with too high a voltage outputs. This has been solved by 7 series diodes. The following photo shows how I have organised them...
Gaz
Attachments
Pic 7/10...
This is a close up of my circuit surgery! You can just see the cuts in the tracks. One is under the single diode and the other is right next to the terminal that the 6 series diodes are soldered to (at the top of the pic)...I think it's quite neat. No short circuit hazards and you can't tel they're there from the component side.
Gaz
This is a close up of my circuit surgery! You can just see the cuts in the tracks. One is under the single diode and the other is right next to the terminal that the 6 series diodes are soldered to (at the top of the pic)...I think it's quite neat. No short circuit hazards and you can't tel they're there from the component side.
Gaz
Attachments
Pic 8/10...
This is my new multimeter. Nothing overly impressive but it is both analogue and digital. The most useful extra features are temperature (cause now I know that the power resistors on my main CD-PRO2 PSU reach a max of 70degs C without cooling) and also the frequency counter that perfectly complements my function generator which has no counter.
Gaz
This is my new multimeter. Nothing overly impressive but it is both analogue and digital. The most useful extra features are temperature (cause now I know that the power resistors on my main CD-PRO2 PSU reach a max of 70degs C without cooling) and also the frequency counter that perfectly complements my function generator which has no counter.
Gaz
Attachments
Pic 10/10...
Finally a pic of it's functions. You'll notice capacitance meter, frerquency counter upto 20kHz in 10Hz steps, transistor tester (top right), temperature and the rest is fairly standard.
I broke a probe on my last one, so I just needed a new meter quickly! Not bad for £40 really.
Gaz
Finally a pic of it's functions. You'll notice capacitance meter, frerquency counter upto 20kHz in 10Hz steps, transistor tester (top right), temperature and the rest is fairly standard.
I broke a probe on my last one, so I just needed a new meter quickly! Not bad for £40 really.
Gaz
Attachments
Nice meter - only £40 you say?
Seems like a bargain to me - where did you get it from if you don't mind me asking?
What are the tolerances like on a meter like that?
🙄
Seems like a bargain to me - where did you get it from if you don't mind me asking?
What are the tolerances like on a meter like that?
🙄
It's from Maplins part code N26AJ. Accuracy is as follows
DC Voltage 0.5%, 5%
AC Voltage 0.8%, 5%
DC Current 0.8%, 5%
AC Current 1.0%, 5%
Resistance 0.8%, 5%
Capacitance 4.0%, 6%
Frequency 1.5%, 5%
Temperature 2%, 6%
The first percentage is the digital display, the second is the analogue pointer. Seems good enough for me!
Gaz
DC Voltage 0.5%, 5%
AC Voltage 0.8%, 5%
DC Current 0.8%, 5%
AC Current 1.0%, 5%
Resistance 0.8%, 5%
Capacitance 4.0%, 6%
Frequency 1.5%, 5%
Temperature 2%, 6%
The first percentage is the digital display, the second is the analogue pointer. Seems good enough for me!
Gaz
Member
Joined 2002
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