50W Stereo Kit amp runs for 1 min, clips then turns off. - Page 6

Al600 · 3rd March 2012, 09:29 AM

Just looking at the kit manual. The transformer has 1 primary coil and 2 secondarys both providing 25V and 6A. Should I be using both of the secondary coils or just the one. I'm measuring 25V between the 2 outer pins of the power supply input.

Al600 · 3rd March 2012, 09:31 AM

Here's the link to my transformer. Does it have a centre tab because I can only make out 2 seperate secondary coils.
Altronics - Your One Stop Audio Visual & Electronics Supplier

AndrewT · 09:39 AM

Have you bought a 230:25-0-25Vac transformer?
or
did you buy a 230:0-25, 0-25Vac transformer?

edit,
the altronics eventually downloaded.
You have bought a 240:0-25, 0-25Vac transformer.
This is a dual secondary transformer.

Al600 · 3rd March 2012, 09:38 AM

I'm honestly not sure. Can you tell from the link I posted? Should I be connecting the 2 secondary coils in series to make 50V or just use one 25V coil?

lanchile · 3rd March 2012, 09:39 AM

Quote:

Originally Posted by Al600

I'm honestly not sure. Can you tell from the link I posted? Should I be connecting the 2 secondary coils in series to make 50V or just use one 25V coil?

use one secondary! White/orange or red/black. also check that bridge rectifier (position)

Pixo · 3rd March 2012, 09:41 AM

Quote:

Originally Posted by Al600

I'm honestly not sure. Can you tell from the link I posted? Should I be connecting the 2 secondary coils in series to make 50V or just use one 25V coil?

looking at the toroid, it's got two secondaries - red & black is one secondary, while white & orange is the other.

lanchile · 3rd March 2012, 09:41 AM

Quote:

Originally Posted by AndrewT

Have you bought a 230:25-0-25Vac transformer?
or
did you buy a 230:0-25, 0-25Vac transformer?

edit,
the altronics eventually downloaded.
You have bought a 240:0-25, 0-25Vac transformer.
This is a dual secondary transformer.

Andrew, I do not think this X has a CT!

Al600 · 3rd March 2012, 09:42 AM

Ok. So I'm using one secondary and the rectifier is correct. From the toroidal schematic you posted earlier perhaps I need to use both of the secondary coils to power the rectifier?

lanchile · 3rd March 2012, 09:44 AM

Quote:

Originally Posted by Al600

Ok. So I'm using one secondary and the rectifier is correct. From the toroidal schematic you posted earlier perhaps I need to use both of the secondary coils to power the rectifier?

Nope! you just need one secondary for this amp, but you will need the center tap.

AndrewT · 3rd March 2012, 09:45 AM

He has bought a Dual Secondary transformer.

If the instructions only specify a Centre Tapped transformer then he must convert the Dual Secondary to Centre Capped.

Should I order the funeral director now, or wait till he stops posting?

3rd March 2012, 09:36 AM	#53
AndrewT diyAudio Member Join Date: Jul 2004 Location: Scottish Borders	Have you bought a 230:25-0-25Vac transformer? or did you buy a 230:0-25, 0-25Vac transformer? edit, the altronics eventually downloaded. You have bought a 240:0-25, 0-25Vac transformer. This is a dual secondary transformer. Last edited by AndrewT; 3rd March 2012 at 09:39 AM.

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3rd March 2012, 09:29 AM	#51
Al600 diyAudio Member Join Date: Mar 2012	Just looking at the kit manual. The transformer has 1 primary coil and 2 secondarys both providing 25V and 6A. Should I be using both of the secondary coils or just the one. I'm measuring 25V between the 2 outer pins of the power supply input.

3rd March 2012, 09:31 AM	#52
Al600 diyAudio Member Join Date: Mar 2012	Here's the link to my transformer. Does it have a centre tab because I can only make out 2 seperate secondary coils. Altronics - Your One Stop Audio Visual & Electronics Supplier

3rd March 2012, 09:38 AM	#54
Al600 diyAudio Member Join Date: Mar 2012	I'm honestly not sure. Can you tell from the link I posted? Should I be connecting the 2 secondary coils in series to make 50V or just use one 25V coil?

3rd March 2012, 09:42 AM	#58
Al600 diyAudio Member Join Date: Mar 2012	Ok. So I'm using one secondary and the rectifier is correct. From the toroidal schematic you posted earlier perhaps I need to use both of the secondary coils to power the rectifier?

3rd March 2012, 09:45 AM	#60
AndrewT diyAudio Member Join Date: Jul 2004 Location: Scottish Borders	He has bought a Dual Secondary transformer. If the instructions only specify a Centre Tapped transformer then he must convert the Dual Secondary to Centre Capped. Should I order the funeral director now, or wait till he stops posting?