Parallel transformer wiring for Aleph30???

hifimaker · 5th February 2006, 08:46 PM

I bought 2 Antek 2x22vac 400va transformers I'd like to use with BrianGT's mini-Aleph PSU board.

I've successfully hooked up the primaries and get 22vac at each of the secondaries.

My question: Is this the correct way to parallel these 2 400va transformers together for a single 22vac secondary with an 800va rating?

Thank you!

-David

mpmarino · 5th February 2006, 09:35 PM

I would just 'dual mono' it with 2 bridges and 2 sets of cap banks. It'll keep you out of trouble and a dual mono 400va each chan on an aleph at those voltages would be better than needed. IMHO those trafos are not EXACTLY matched and they won't play equally in parallel (load share) as you would like.....

regards...

edit: oh...but your schem does seem to be correct if you wanted to..

tja · 5th February 2006, 10:16 PM

What are you going to use for the other secondary?

Take

hifimaker · 6th February 2006, 03:31 AM

I was hoping to use a single powersupply with one bridge rectifier. Is this practical? The other option is to use 2 PSU boards, but given space limitations I was hoping to get away with only one.

Thank you,

-David

tja · 6th February 2006, 04:23 AM

You need both +22V and -22V. The scheme you cooked up above delivers just one of them. If you want to use one bridge parallel each transformers secondaries and use one transformer for the positive side and one for the negative.

In the attached picture break connections at the red crosses, join the green connection and attach it to ground

Be sure to verify this with someone who knows a heck of a lot more than I do.

Take

mpmarino · 6th February 2006, 01:31 PM

Take is right..your orig. schem is wrong. But I think you would want it as below. I would still go dual mono or at least use 2 bridges and parallel the dc after the bridges.....

hifimaker · 6th February 2006, 04:09 PM

Quote:

Originally posted by mpmarino
Take is right..your orig. schem is wrong. But I think you would want it as below. I would still go dual mono or at least use 2 bridges and parallel the dc after the bridges.....

mpmario and Take,

Thank you so much for your help!

I'm looking to get 22vac at the input of the rectifier. Would this design give 44vac or 22vac?

Thank you,

-David

mpmarino · 6th February 2006, 07:26 PM

44 vac total , or in other words, +-22vac referenced to the ground shown in my schem. If your building a traditional aleph 30 type amp you need about that voltage before rectification.

someone please flame me if i'm wrong so dw doesn't blow himself up.

hifimaker · 7th February 2006, 12:23 AM

I hooked it up as diagramed in post #1 and I'm getting +-15.6 volts after the rectifier. I was hoping to see 25vdc.

What's wrong here?

Thanks!

-David

Zen Mod · 7th February 2006, 12:52 AM

Quote:

Originally posted by dw8083
I hooked it up as diagramed in post #1 and I'm getting +-15.6 volts after the rectifier. I was hoping to see 25vdc.

What's wrong here?

Thanks!

-David

you need caps after the bridge.

5th February 2006, 09:35 PM	#2
mpmarino diyAudio Member Join Date: Jun 2004 Location: Crunchville, where I don't fit in.	I would just 'dual mono' it with 2 bridges and 2 sets of cap banks. It'll keep you out of trouble and a dual mono 400va each chan on an aleph at those voltages would be better than needed. IMHO those trafos are not EXACTLY matched and they won't play equally in parallel (load share) as you would like..... regards... edit: oh...but your schem does seem to be correct if you wanted to.. __________________ Crazy Yankee.

5th February 2006, 10:16 PM	#3
tja diyAudio Member Join Date: Feb 2004 Location: Leiden	Only one secondary? What are you going to use for the other secondary? Take

6th February 2006, 07:26 PM	#8
mpmarino diyAudio Member Join Date: Jun 2004 Location: Crunchville, where I don't fit in.	44 vac total , or in other words, +-22vac referenced to the ground shown in my schem. If your building a traditional aleph 30 type amp you need about that voltage before rectification. someone please flame me if i'm wrong so dw doesn't blow himself up. __________________ Crazy Yankee.

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6th February 2006, 03:31 AM	#4
hifimaker diyAudio Member Join Date: Oct 2003 Location: San Jose	I was hoping to use a single powersupply with one bridge rectifier. Is this practical? The other option is to use 2 PSU boards, but given space limitations I was hoping to get away with only one. Thank you, -David

7th February 2006, 12:23 AM	#9
hifimaker diyAudio Member Join Date: Oct 2003 Location: San Jose	I hooked it up as diagramed in post #1 and I'm getting +-15.6 volts after the rectifier. I was hoping to see 25vdc. What's wrong here? Thanks! -David

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