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Old 2nd December 2008, 01:50 AM   #1011
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Quote:
Originally posted by rjm
The AD828 brings some interesting traits to the table. The only thing to watch out for is the bandwidth will be about 10 times higher than the OPA2134 etc. More rigorous bypassing - a small low inductance capacitor placed directly next to the power pins - may be required for stability.


Thanks for your suggestion, can you please suggest a value and the location? (sorry I'm not very good in electronics)

Quote:
Output caps: whatever works for you. Suggest downsizing to 1 uF or 2.2 uF for the really expensive ones and save a little money.
How much it affect the sound quality?
I found that it's very good after replaced with Auri caps (quite expensive)

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For your viewing pleasure: the beta version of the Phonoclone 3 boards, currently being made by the Christmas elves at Olimex. I have a couple of spares if anyone is feeling adventurous and can't wait for me to build one and report the results. $40 for a pair of double sided boards.
Will you take the order now?
I want a set of boards.

What kind of info. I've to sent you?

Thanks.
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Old 3rd December 2008, 05:57 AM   #1012
rjm is offline rjm  Japan
Richard Murdey
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Quote:
Originally posted by johnsonlam
Thanks for your suggestion, can you please suggest a value and the location?

I want a set of boards.
What kind of info. I've to sent you?
1. Try a small electrolytic 1 uF to 100 uF between a point very close to the IC power pins back to where the output ground wire connects to the VSPS board. If it sounds fine to your ears as it is now, though, I wouln't worry about it.

2. Just send me the request by email. I will reply letting you know my paypal address.
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Old 4th December 2008, 03:17 AM   #1013
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I found that your VSPS changed, if using OPA134 your layout was not correct, it should be OPA2134.

You mean 1uF between Output pin (arrow on the layout) and the OpAmp's power pin (pin 8 for OPA2134 or pin compatible OpAmp)?

Since OPA134 is single (pin 7), OPA2134 (pin 8).

Thanks.
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Old 4th December 2008, 05:00 AM   #1014
rjm is offline rjm  Japan
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I was going by the photo you posted above, which shows a stereo board layout with a dual op amp, but the discussion applied equally well to a dual mono design.

For the stereo layout, going by the diagram on my web page, the bypass caps would go between pin 4 of the opamp (or close) and the output return (green circle).
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Old 4th December 2008, 07:04 AM   #1015
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Quote:
Originally posted by rjm
I was going by the photo you posted above, which shows a stereo board layout with a dual op amp, but the discussion applied equally well to a dual mono design.


Understand.

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For the stereo layout, going by the diagram on my web page, the bypass caps would go between pin 4 of the opamp (or close) and the output return (green circle).
Thank you for your advise!
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Old 23rd December 2008, 05:46 AM   #1016
juluska is offline juluska  Ukraine
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Default schottky diodes

I've changed the rectifier of may vsps with two discrete schottky bridges. The sound is different, softer...
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Old 23rd December 2008, 05:47 AM   #1017
juluska is offline juluska  Ukraine
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Default schottky

.
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Old 27th December 2008, 11:45 PM   #1018
Kevlogg is offline Kevlogg  United States
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My First post
Let me introduce myself, I am 28 yo from US, just starting my junior year. I begin EE classes, and I am excited to start. My wife asked for a TT for Xmas, and we are both thrilled with the sound. It has a built in pre AT-P120, but I thought it would be a nice compliment to my classes if I did some audio circuit projects. I have ordered 2 VSPS PCB's and some components, But I am still a bit fuzzy on the power supply.

This should work, correct?

http://cgi.ebay.com/ws/eBayISAPI.dll...tab%3DWatching

and how do I match the rectifier :s

Are there any PS online that could be a cheap fix?
It seems that the toroidal transformer is essential for quality...

anyway, I have read many threads, and I think this board is the best!

After this project, I think I will try a tube pre :P
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Old 31st December 2008, 02:15 AM   #1019
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I haven't read the whole thread. Has anyone powered this with a battery?
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Old 31st December 2008, 05:31 AM   #1020
juluska is offline juluska  Ukraine
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Kevlogg, this toroidal is enough. 5VA is enough, but the bigger you can use will be better. I've used a 50VA. If you are going to do more projects you can use a bigger toroidal to probe another amplifier pcbs.
A very low noise is always present from the toroidal, if you can chose an en capsulated toroidal.
Think in doing it point to point in a protoboard, is more flexible and funny.
Probe with double bridge fast rectifiers and also with schottky discrete double rectifiers. I've probe this and the sound diferent.
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