Transformer size

rootbeer · 2nd January 2009, 11:58 PM

I thought about including this in a thread that i already have but my guess is that this might be a good question for others as well. I have been searching all day for information on how to choose the right size transformer for class d. All information i have found is in regards to A or AB.

In my case using the NewClassD modules with 1 PSU. I will be powering 200watt max 89db sensitivity towers.

e_fortier · 4th January 2009, 04:42 PM

Hi,

Look at this thread.

Eric

Transformer

eclectic2k · 4th January 2009, 08:41 PM

in a nutshell, since ClassD is very efficient, you do not have all of the losses involved in A & A/B amps so you do not need to over size the supply so much.

You would do very well with a VA rating ~ the same as your desired output watts.

so say for 200W per channel, two channels = 400W -- a 400VA transformer should do very well.

Looking around at commonly available transformers would seem to recommend aiming for a 500VA model from any of the usual suppliers.

even this is still conservative, since real music and general audio material will not push an amp to more than a few % of it's real rated output very often.
(really 300VA would even be fine, but 500 will give lot's of headroom and a bit stronger supply

-CK

e_fortier · 4th January 2009, 08:50 PM

Hi,

Please check these guys out, you can get a 400VA for 44 USD.

I just ordered a few from them.

Antek Xtrm

Eric

2nd January 2009, 11:58 PM	#1
rootbeer diyAudio Member Join Date: Apr 2008	Transformer size I thought about including this in a thread that i already have but my guess is that this might be a good question for others as well. I have been searching all day for information on how to choose the right size transformer for class d. All information i have found is in regards to A or AB. In my case using the NewClassD modules with 1 PSU. I will be powering 200watt max 89db sensitivity towers.

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4th January 2009, 04:42 PM	#2
e_fortier diyAudio Member Join Date: May 2001 Location: Montreal	Hi, Look at this thread. Eric Transformer

4th January 2009, 08:41 PM	#3
eclectic2k diyAudio Member Join Date: Nov 2005 Location: Silicon Valley	in a nutshell, since ClassD is very efficient, you do not have all of the losses involved in A & A/B amps so you do not need to over size the supply so much. You would do very well with a VA rating ~ the same as your desired output watts. so say for 200W per channel, two channels = 400W -- a 400VA transformer should do very well. Looking around at commonly available transformers would seem to recommend aiming for a 500VA model from any of the usual suppliers. even this is still conservative, since real music and general audio material will not push an amp to more than a few % of it's real rated output very often. (really 300VA would even be fine, but 500 will give lot's of headroom and a bit stronger supply -CK

4th January 2009, 08:50 PM	#4
e_fortier diyAudio Member Join Date: May 2001 Location: Montreal	Hi, Please check these guys out, you can get a 400VA for 44 USD. I just ordered a few from them. Antek Xtrm Eric

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