PSU transformer question - Page 2

kyrochan · 24th March 2005, 11:59 AM

Why double the voltage? It should let me have 24volt and should doublig the ampère...
or not?
I want to use for each channel a pair of these transformer

audiofan · 24th March 2005, 12:26 PM

primaries should be in parallel and connected to mains at nominal voltage if you want to get the maximal power period..
then secondaries should be in series if you want to double the output voltage and get nominal current. In this type of connection a ""reversed''' connection will give no voltage at all
the secondarie should be in parallel if you want the nominal voltge and double the current.In this type of connection a ''reversed '' connection will short circuit the transformer and must be avoided, this is why you need to test with a ligtbulb.

kyrochan · 24th March 2005, 01:42 PM

Hi, audiofan. what you say was clear to me...my last question is above the use of the bridge rectifiers in the way shown in the picture, this should let me avoid the problem of little difference in voltage between the secondaries... 0.5mv or so... this idea is of dejan vaselinovich (check its articule on www.TNT-audio.com)
Hi,
Domenico

Giaime · 24th March 2005, 02:40 PM

Quote:

Originally posted by kyrochan
(check its articule on www.TNT-audio.com)
Hi,
Domenico

Wow! Another www.tnt-audio.com fanatic! Just like me!

audiofan · 24th March 2005, 08:56 PM

Ihave check the ''psu2.jpg ''attachement and if I read it correctly it is a hoak........... it does not work.

I you follow the circuit from the ground point on the upper bridge, throug the diode ( top left) in this bridge, the upper transformer winding,the diode in the lower bridge (top left) you go to ground again, short circuit guarantied, bye....... the fuse or bye...... the transformer.....if no fuse in the circuit.

kyrochan · 25th March 2005, 09:38 AM

I find by myself the problem in the project! Just before you post the reply!! What stupid thing!
So I redraw the psu in this way did you think that the two diodes par rail should help with that 0.5mv of difference?
Wich diode I should use for best performance?

audiofan · 25th March 2005, 12:01 PM

this will not work each transfo in use in series with a pair of diode and will use only half the ac signal

if you have a pair of similar tranfo same brand same model same batch you may wire them in parallel and this is it ( with correct phase )

if you want someting for the ubalance wire each transfo to a full wave bridge the usual way ant connect in parallel the output of the bridge this will work

DigitalJunkie · 25th March 2005, 12:54 PM

This is a schematic for a high current 12V supply,so you can kind of ignore that part of it..But,It Does show the parallel-bridge setup.
http://www.users.qwest.net/~ptaylor/...pplySchema.jpg

You would parallel 2 transformers and 2 bridges for each rail of your split supply.So you'd have one pair of transformers and bridges for the +V rail,and another pair of trannies and bridges for the -V rail.

Hope that helps out a bit..

kyrochan · 25th March 2005, 02:01 PM

Thank you everybody, I think I will use the Digital junkye suggest...or simply I will match the wire...(with correct phase)..Thank You!

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24th March 2005, 11:59 AM	#11
kyrochan diyAudio Member Join Date: Jan 2005 Location: Bari	Why double the voltage? It should let me have 24volt and should doublig the ampère... or not? I want to use for each channel a pair of these transformer

24th March 2005, 12:26 PM	#12
audiofan diyAudio Member Join Date: May 2003 Location: quebec	primaries should be in parallel and connected to mains at nominal voltage if you want to get the maximal power period.. then secondaries should be in series if you want to double the output voltage and get nominal current. In this type of connection a ""reversed''' connection will give no voltage at all the secondarie should be in parallel if you want the nominal voltge and double the current.In this type of connection a ''reversed '' connection will short circuit the transformer and must be avoided, this is why you need to test with a ligtbulb.

24th March 2005, 01:42 PM	#13
kyrochan diyAudio Member Join Date: Jan 2005 Location: Bari	Hi, audiofan. what you say was clear to me...my last question is above the use of the bridge rectifiers in the way shown in the picture, this should let me avoid the problem of little difference in voltage between the secondaries... 0.5mv or so... this idea is of dejan vaselinovich (check its articule on www.TNT-audio.com) Hi, Domenico

24th March 2005, 08:56 PM	#15
audiofan diyAudio Member Join Date: May 2003 Location: quebec	Ihave check the ''psu2.jpg ''attachement and if I read it correctly it is a hoak........... it does not work. I you follow the circuit from the ground point on the upper bridge, throug the diode ( top left) in this bridge, the upper transformer winding,the diode in the lower bridge (top left) you go to ground again, short circuit guarantied, bye....... the fuse or bye...... the transformer.....if no fuse in the circuit.

25th March 2005, 12:01 PM	#17
audiofan diyAudio Member Join Date: May 2003 Location: quebec	this will not work each transfo in use in series with a pair of diode and will use only half the ac signal if you have a pair of similar tranfo same brand same model same batch you may wire them in parallel and this is it ( with correct phase ) if you want someting for the ubalance wire each transfo to a full wave bridge the usual way ant connect in parallel the output of the bridge this will work

25th March 2005, 12:54 PM	#18
DigitalJunkie diyAudio Member Join Date: Apr 2003 Location: Portland,Oregon Blog Entries: 4	This is a schematic for a high current 12V supply,so you can kind of ignore that part of it..But,It Does show the parallel-bridge setup. http://www.users.qwest.net/~ptaylor/...pplySchema.jpg You would parallel 2 transformers and 2 bridges for each rail of your split supply.So you'd have one pair of transformers and bridges for the +V rail,and another pair of trannies and bridges for the -V rail. Hope that helps out a bit..

25th March 2005, 02:01 PM	#19
kyrochan diyAudio Member Join Date: Jan 2005 Location: Bari	Thank you everybody, I think I will use the Digital junkye suggest...or simply I will match the wire...(with correct phase)..Thank You!