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Old 18th January 2012, 03:18 PM   #17861
UV101 is offline UV101  England
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Sorry, was a bit pissed that its happened to me several times lately when I've written a longish post!!!

As Simon said, the 0's become the centre tap and the others will be AC above and below that gnd.

This should help
Click the image to open in full size.

For the Servo section as stated go big VA! So in that pic you want from left to right

100va 2x15vac (no fuse), Hexfred diodes, 2 x 22,000uF (C1&C2), +/- 12v Spowers regs, Rubycon ZLG 470uF (C5&C6). I wouldnt bother with the bypass caps.

Ben you know you're ready for the SPower!!! lol
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Last edited by UV101; 18th January 2012 at 03:24 PM.
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Old 19th January 2012, 12:31 AM   #17862
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Quote:
Originally Posted by Fidelity Audio View Post
The 63 makes a fantastic transport if you feed the +/- supply with a 50VA + transformer. Fit 2x large value caps (22000uF preferable)

You don't need to clock the dac either as it is not used when using as a transport run that 16.9 clock direct to the decoder. Clock the servo. Fit separate regs to the servo and decoder chip (4 in total). Fit caps like Oscon SEPC on the 5v rails to those chips after the regs. Once run and tested get rid of the fuses on the pcb as they do not help audio at all

Brent
When use as a transport and with output opamps removed, the 12V regulated dual supply theoritically can be used to drive servo section
Anybody tried that? Comments please
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Old 19th January 2012, 01:54 AM   #17863
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Thanks Ian, sounds tasty. So let me get this straight - this is not just replacing the toroid but building a seperate off-board regulated supply and feeding the servo section as a whole? Are you suggesting one pair of SPowers to feed all three driver ICs, or is that three pairs tied to the pins? I'm thinking I could do the big toroid first as it is way cheaper, but you're saying go for a 15v not a 12v in this case. Is that because SPowers need a lot of headroom? I'm getting there, but I still have a lot to learn before I can make all the connections. This is the guy who just discovered recently that he has Black Gates on his display supply :-/

btw, it's hard to get Nuvotem here. I've been looking at Hammond. They're quite a lot more expensive but not sure how they compare.
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Last edited by Ben Hanke; 19th January 2012 at 01:56 AM.
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Old 19th January 2012, 06:13 AM   #17864
UV101 is offline UV101  England
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Quote:
Originally Posted by Audiohifi View Post
When use as a transport and with output opamps removed, the 12V regulated dual supply theoritically can be used to drive servo section
Anybody tried that? Comments please
It will work for sure however the transformer va will no be anywhere near the 50-100va that is being recommended and you will still need the large caps. The 22,000uF being suggested pre 5v has a large impact on the servo section so you'd want the same here. Try it, I'm not aware that anyone else here has??

Ben, offboard psu is great here. when I did mine, I used 3 pairs of SPowers. Obviously this is a massive outlay and not for everyone. You will get significant gains using a single pair for all 3 drivers to start. As far as I'm aware, the spower is the only commercial reg in a small
(to220) that can supply the current you want here. Does RS have a presence near you? They sell a few cheaper toroids.
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Old 19th January 2012, 08:03 AM   #17865
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Ben the analogue winding of the TX is no where near good enough. If you do not need the output remove the tx. Fit a new one in its place and then fit a small tx for display. Use my guide - The worlds greatest CD63 !. Look at the Servo Supply sch.

Ian thanks for mentioning the SPower We do now recommend the SPower HC for the servo driver ic and outputs and the SPower 'D' (discrete regulator) for servo chips 5v rails.

We also have two new clocks coming out in 1 - 2 months. The C3 that is a replacement for C2 + Micro Clock 2 both using the Spower 'D' discrete regulation.

Brent
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Old 19th January 2012, 08:29 AM   #17866
SimontY is offline SimontY  United Kingdom
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Quote:
Originally Posted by UV101 View Post
It will work for sure
Eck, it might burn up! The servo's pretty hungry.
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Old 19th January 2012, 08:48 AM   #17867
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Originally Posted by SimontY View Post
Eck, it might burn up! The servo's pretty hungry.
It more than likely will not run as the voltage sag will be too much. But yeah the tx will at the very least run fairly hot.

Brent
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Old 19th January 2012, 09:32 AM   #17868
UV101 is offline UV101  England
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These look very useful if you are thinking about a servo PSU Ben......

Click the image to open in full size.

Dual Rail Linear Power Supply PCB -Rectifier/Filter x2 | eBay
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Old 19th January 2012, 02:13 PM   #17869
RCruz is offline RCruz  Switzerland
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Cool link UV101
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Old 20th January 2012, 07:11 AM   #17870
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Very nice. That looks very flexible. I really want to work up to the regulated supply, but I'm putting it on the back burner for now. It's not just the cash - it's also space, because I'm not ready to break out of my box yet. So, I've taken the baby step option of ordering the 3 transformer values specified in Brent's guide - all three for $65 from RS. I wanted a 100VA+ for the servo, but it looks as though I only just about have enough space for a 50VA Nuvotem before I have to start hacking my tray and cross brace to pieces. Hopefully this will be a nice upgrade and I will still have room to fit my clock PSU when my XO2s arrive.

p.s. I'll definitely be getting SPowers for my DOS because I want to go all out on that when I get to it.
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