New Posts New Posts RSS Feed - 5V 3A PSU
  FAQ FAQ  Forum Search   Events   Register Register  Login Login

Welcome to the Graham Slee Audio Products Owners Club

 

Open to all owners plus those contemplating the purchase of a Graham Slee audio product wishing to use our loaner program: join here
Subscribe to our newsletter here (Rules on posting can be found here)


5V 3A PSU

 Post Reply Post Reply Page  <1 3435363738>
Author
BackinBlack View Drop Down
Senior Member
Senior Member
Avatar

Joined: 05 Feb 2012
Location: Hinton, N'hants
Status: Offline
Points: 1322
Post Options Post Options   Thanks (0) Thanks(0)   Quote BackinBlack Quote  Post ReplyReply Direct Link To This Post Posted: 10 Apr 2019 at 10:30pm
Thanks Graham, now I can make room for one. Big smile
Just listen, if it sounds good to you, enjoy it.
Back to Top
Ash View Drop Down
Senior Member
Senior Member
Avatar

Joined: 18 Mar 2013
Location: Dorset
Status: Offline
Points: 2801
Post Options Post Options   Thanks (0) Thanks(0)   Quote Ash Quote  Post ReplyReply Direct Link To This Post Posted: 21 Apr 2019 at 9:42pm
C'mon then, how's it going?
Back to Top
Graham Slee View Drop Down
Admin Group
Admin Group
Avatar
Telling it as it is

Joined: 11 Jan 2008
Location: South Yorkshire
Status: Offline
Points: 8360
Post Options Post Options   Thanks (0) Thanks(0)   Quote Graham Slee Quote  Post ReplyReply Direct Link To This Post Posted: 22 Apr 2019 at 12:11pm
Originally posted by Ash Ash wrote:

C'mon then, how's it going?


I'm building it. Slowly. I will upload photos shortly.
Not simple enough for Google-Bot to understand...
Back to Top
Graham Slee View Drop Down
Admin Group
Admin Group
Avatar
Telling it as it is

Joined: 11 Jan 2008
Location: South Yorkshire
Status: Offline
Points: 8360
Post Options Post Options   Thanks (0) Thanks(0)   Quote Graham Slee Quote  Post ReplyReply Direct Link To This Post Posted: 24 Apr 2019 at 6:44pm
Would have been finished today but for one thing...

Convention usually has it that the dual primaries are coded such that when wired in series for 230V the wires across the mains are brown and blue. So guess what I did? Joined the other two colours: green and voilet. Except...

That's not how the actual transformer was wired. I could not understand why until I looked at its data sheet, by which time I'd committed the cardinal sin of uprating the fuse which burned out the transformer.

Never mind. More transformers and fuses on the way.

The real upset for me is I took lots of photos of the build and the ones showing the transformer wiring will now have to be taken again.
Not simple enough for Google-Bot to understand...
Back to Top
BackinBlack View Drop Down
Senior Member
Senior Member
Avatar

Joined: 05 Feb 2012
Location: Hinton, N'hants
Status: Offline
Points: 1322
Post Options Post Options   Thanks (0) Thanks(0)   Quote BackinBlack Quote  Post ReplyReply Direct Link To This Post Posted: 24 Apr 2019 at 7:48pm
Conventions aren't what they used to be. Confused
Except that is for the old adage - If all else fails, Read the Instructions!!!!!!!!! LOL

Oh, and I should say that we've all done similar things, haven't we?


Edited by BackinBlack - 24 Apr 2019 at 8:14pm
Just listen, if it sounds good to you, enjoy it.
Back to Top
Graham Slee View Drop Down
Admin Group
Admin Group
Avatar
Telling it as it is

Joined: 11 Jan 2008
Location: South Yorkshire
Status: Offline
Points: 8360
Post Options Post Options   Thanks (0) Thanks(0)   Quote Graham Slee Quote  Post ReplyReply Direct Link To This Post Posted: 24 Apr 2019 at 10:13pm
Well, in my defence I have to ask why make one 115V winding brown and blue, and the other 115V winding green and violet?

If it were for 115V mains such as the US and Canada, the colours are red and white!

And on the transformer in the power amp the colours are brown and violet for one 115V winding, and grey and blue for the other, such that wired in series violet and grey are connected, and brown and blue are connected to 230V - just like the mains wiring convention of the UK and the whole of Europe!!!

And being European, all the RS Components transformers are CE marked!

So I think it a bit odd that in this case blue and green are connected together leaving brown and violet for 230V connection.

And I must say I am very disappointed in RS. I wrote earlier in the 1970s Design Indulgence topic "So this is why I have been persevering with the transformers from RS Components - they still having the sense of duty and decency of Waring and Sebestyen from 1937. How much longer this will last is anyone's guess."

Didn't last long IMO.
Not simple enough for Google-Bot to understand...
Back to Top
peterb View Drop Down
Senior Member
Senior Member


Joined: 02 Feb 2017
Location: Cornwall
Status: Offline
Points: 118
Post Options Post Options   Thanks (0) Thanks(0)   Quote peterb Quote  Post ReplyReply Direct Link To This Post Posted: 25 Apr 2019 at 9:12am
I am glad that I am not alone is making assumptions that I regret later on, despite if well founded ones!

If these are RS torroids I think they are branded, maybe re-specd trafos from Telma Nuvotem. A word of warning. I struggled with these in my Power Amp because of their hum and buzz, nothing got rid of it. This could be an issue for an always on device. 
I have mentioned this on another thread on this forum and I ended up getting one specially made and it was a huge improvement.
Peter
---------------------------------------
Dual 505-1, Cyrus CD T, DIY 80W MosFet amp and PreAmp, 2xKEF 103.2
Back to Top
 Post Reply Post Reply Page  <1 3435363738>
  Share Topic   

Forum Jump Forum Permissions View Drop Down

Forum Software by Web Wiz Forums® version 12.01
Copyright ©2001-2018 Web Wiz Ltd.

This page was generated in 0.063 seconds.