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Old 1st July 2012, 07:16 AM   #18251
6h5c is offline 6h5c  Netherlands
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Hi Ben,

That's a know issue. This is to make sure all supply voltages come on at the same time at power up. Otherwise strange things can happen... If you use separate PSU's, you should be fine if they are equal in size (power) and buffer capacity, so their start-up time is equal.

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Old 1st July 2012, 08:04 AM   #18252
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Hooray, with a capital Ray!

I'm on 3 separate decoder supplies with no apparent issues. I've been running that way for months. I tried combining them this afternoon as a test and it seemed to make no difference. The supplies are pretty much identical.

I've been having some start-up issues, but I think I've tracked them down to a bad servo clock connection. I have some very broken trace around that area, unfortunately. I've recently had an issue where the sled would sometimes go crazy on a cold start but would be OK if I turned off and on again. I got the board out today and found the servo clock was loose and it seems OK now.

I'm thinking about doing a couple more Fleas for at least DAC analogue supplies.
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Old 1st July 2012, 08:14 AM   #18253
poynton is offline poynton  United Kingdom
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Quote:
Originally Posted by bikeral10 View Post
my next question would it be worth my while to transplant a 63se tx to a 63 std save me a lot of swapping.
alan
Short answer is No.

If you want an improvement, use a KI transformer (or multiple transformers)


Andy

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Old 1st July 2012, 08:25 AM   #18254
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I did a bit of experimenting recently with my transformers. I went back to the stock KI Tx as a test and was blown away by how much of a step backwards it was. It was unlistenable; just too harsh on the treble. I'd say definitely get yourself a big 50+ VA servo PSU. I currently have the original KI transformer just for my display, so there's loads of room.
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Old 1st July 2012, 09:09 AM   #18255
6h5c is offline 6h5c  Netherlands
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Quote:
Originally Posted by Ben Hanke View Post
Hooray, with a capital Ray!


Ok, your decoder supplies are fine then. The servo indeed benefits from a large, regulated PSU. You can still use the original transformer to power the peripheral stuff, like the display and microcontroller.

Ray
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Old 1st July 2012, 03:44 PM   #18256
lymmlad is offline lymmlad  England
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Quote:
Originally Posted by Ben Hanke View Post
I did a bit of experimenting recently with my transformers. I went back to the stock KI Tx as a test and was blown away by how much of a step backwards it was. It was unlistenable; just too harsh on the treble. I'd say definitely get yourself a big 50+ VA servo PSU. I currently have the original KI transformer just for my display, so there's loads of room.
Ben, do you mount the bigger transformer within the case or externally and if externally how do you do this? Thanks in advance.
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Old 1st July 2012, 04:02 PM   #18257
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Default Servo PSU

There's definitely some room for individual experimentation with regard to PSU placement, but I find that a 50VA 12V Nuvotem fits in quite nicely behind the CD tray. Wire the secondaries to U308 & U310 and centre tap / both grounds to U309. Tape the original servo secondaries up securely with electrical tape to make sure they don't touch anything or each other.

See this post by Ian for suggestions on how to go further.

Brent also has a good summary of upgrading the servo section on his site here

Ben
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Old 2nd July 2012, 08:27 AM   #18258
Chivvyp is offline Chivvyp  United Kingdom
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Originally Posted by Ben Hanke View Post
I just discovered this note in the SAA7345GP (decoder chip) datasheet:

1. All supply pins must be connected to the same external power supply.

Whoops...!
I always read that as they should all come via one mains lead.
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Old 2nd July 2012, 06:25 PM   #18259
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Originally Posted by Chivvyp View Post
I always read that as they should all come via one mains lead.
Sounds spot on to me!!!!!!

A bit off topic, but I treated myself!!!!

Its got 680va transformer, 160,000uF smoothers in the power amp psu and 80,000uF in the preamp. Runs 80+80W full class A fully balanced if you have a balanced source, has a stepped attenuator volume control that runs via 24 relays switching the resistors in and out! I weighs just under 30kgs and best of all its got massive proper analogue VU meters that are lit blue!!!
How does it sound?........er like nothing I've heard previously! I'm actually quite speechless which for me is quite unusual!!!!



Click the image to open in full size.

Click the image to open in full size.

Couldnt resist having a look!!!!!

Click the image to open in full size.
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Last edited by UV101; 2nd July 2012 at 06:33 PM.
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Old 2nd July 2012, 07:14 PM   #18260
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