Pics: CD-PRO2 PSU & TDA1543 DAC - diyAudio
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Old 18th July 2003, 07:43 PM   #1
Rarkov is offline Rarkov  England
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Default Pics: CD-PRO2 PSU & TDA1543 DAC

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
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Old 18th July 2003, 07:46 PM   #2
Rarkov is offline Rarkov  England
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Pic 2/5...

This is the DAC's PSU. It has large amounts of filtering and puts out a PERFECT 5V! Large space around edges are to help disperse with micro-vibrations from the transformer (or I just had that boad to hand! )

Gaz
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Old 18th July 2003, 07:51 PM   #3
Rarkov is offline Rarkov  England
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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
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Old 18th July 2003, 07:55 PM   #4
Rarkov is offline Rarkov  England
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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
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Old 18th July 2003, 07:56 PM   #5
Rarkov is offline Rarkov  England
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Pic 5/5...

Well here they all are...This is just for size purposes really...
Hope you enjoyed the little slide show!

Thanks,
Gaz
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Old 18th July 2003, 07:59 PM   #6
Bricolo is offline Bricolo  France
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nice work, gaz!

show us some pictures of the whole player, when you'll have finished it.
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Old 18th July 2003, 08:01 PM   #7
BrianGT is offline BrianGT  United States
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What schematic did you use for the cdpro2 power supply?

--
Brian
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Old 18th July 2003, 08:08 PM   #8
Rarkov is offline Rarkov  England
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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
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Old 19th July 2003, 03:57 PM   #9
SimontY is offline SimontY  United Kingdom
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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
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Old 19th July 2003, 08:50 PM   #10
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Quote:
Originally posted by Rarkov
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

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.
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