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Old 27th September 2003, 06:39 PM   #1
Raj1 is offline Raj1  United Kingdom
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Exclamation is this transformer ok??

Hi,

Here is the wire out for the isolation
transformers I have


http://www.antrimtransformers.com/colour_codes.htm

The transformer has twin 115v primaries, and I have wired them as follows

white and black together, pink to ac hot and brown to ac cold. which is fine for the european 230v.....


the output stage is here,

http://www.ultranalog.com/cdenhancer...ancer2_3a5.pdf



If I link the yellow and blue secondries, they become the centre tap, but I think I would then get 230v accross the circuit??????

If I link the red and blue secondries and the grey and yellow I get 115v-115v, which is still unsuitable cause I have no centre tap????

I have three of these transformers which I got cheap, but are they unsuitable for the above circuit???

Thanks
Raja
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Old 27th September 2003, 07:53 PM   #2
Raj1 is offline Raj1  United Kingdom
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Default would this work???

Hi,

Okay if I have only 115v-155v secondries, I can see 2 options

1) Is to use 2 isolation transformers, with one wired directly to mains, providing 115v-155v on the secondries. The secondries would then be wired to the primaries of the second transformer, which sholud give me a 115v-0-115v secondries.

Or please correct me if I'm wrong!!!

to use a diode on the output of the rectifier like this;


Thanks
Raja
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Old 27th September 2003, 08:02 PM   #3
Raj1 is offline Raj1  United Kingdom
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Or This?



Thanks Raja
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Old 27th September 2003, 08:05 PM   #4
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Hi,

Raja,

If you don't mind I'll have a look later tonight...just don't do anything yet.

Cheers,
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Old 28th September 2003, 01:53 AM   #5
SHiFTY is offline SHiFTY  New Zealand
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I would use a single 115V secondary (non centre tapped) with a hybrid rectifier as shown below...

You could also use UF4007 fast recovery diodes if you wanted.
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Old 28th September 2003, 10:12 AM   #6
Raj1 is offline Raj1  United Kingdom
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Hi,

Well I've already got the AZ1, but no base, instead I've been advised to solder directly to pins.......

I'll use the diodes as above to obtain the 0v, thanks for the help....


Regards Raja
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Old 28th September 2003, 10:17 AM   #7
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You might onsider 2 rectifier tubes...but the voltage drop might be too big for any use..hehehe
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Old 28th September 2003, 12:33 PM   #8
G is offline G  United States
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I have to agree with shifty. Using UF4007s would seem to be the way to go. I don't think that the transformer you have has a filament winding does it? Either way what is the power rating of the transformer. I'll run a simulation and see what the results are.

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Old 28th September 2003, 01:13 PM   #9
Colt45 is offline Colt45  Serbia
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what do you need ultrafast diodes for?
were talking about 60/50hz here
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Old 28th September 2003, 01:35 PM   #10
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It would reduce switching transcients and reduce noise presumably...I use MUR860s all over the place...even if the design does not call for it...coz I got a lot of them...and not 1N4007s...hehehe
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