Transformer buying advice

Lou Cipher · 19th April 2005, 10:40 AM

Which transformers do you recommend for an amplifier. Do they differ alot regarding shielding, hum etc.

dhaen · 19th April 2005, 11:21 AM

Hi,

I think your question is rather broad. There is no "best for all".
Is there a particular amplifier you are thinking of?

John

pinkmouse · 19th April 2005, 11:22 AM

...And also possibly very expensive...

Lou Cipher · 19th April 2005, 11:29 AM

I'm going to use it in a ZAPpulse amplifier in a dual mono configuration i.e. one transformer for each channel.

Lou Cipher · 20th April 2005, 10:40 AM

any advise??

richie00boy · 20th April 2005, 10:56 AM

Well you want a toroidal transformer. It depends on what you have available to you and how much you are willing to pay. There can be a large difference between a cheap one and an expensive one due to the core material and if it has a screen or not. However, expensive doesn't always guarantee quality.

Don't bother with fully potted ones, they are just for looks and worsen heat performance and are just heavy.

I just get mine from Farnell.

As far as VA rating goes, look up in the ZAPpulse cookbook to see what voltage you need for what power and load, then the VA you need is approx 1.37x the load power. Note this rule of thumb applies to class-d only.

19th April 2005, 10:40 AM	#1
Lou Cipher diyAudio Member Join Date: Mar 2005 Location: Stockholm	Transformer buying advice Which transformers do you recommend for an amplifier. Do they differ alot regarding shielding, hum etc.

19th April 2005, 11:22 AM	#3
pinkmouse diyAudio Moderator Join Date: Apr 2002 Location: Chatham, England	...And also possibly very expensive... __________________ Al I conceive of nothing, in religion, science or philosophy, that is more than the proper thing to wear, for a while. Charles Fort

20th April 2005, 10:56 AM	#6
richie00boy Did it Himself diyAudio Member Join Date: Nov 2003 Location: Gloucestershire, England, UK	Well you want a toroidal transformer. It depends on what you have available to you and how much you are willing to pay. There can be a large difference between a cheap one and an expensive one due to the core material and if it has a screen or not. However, expensive doesn't always guarantee quality. Don't bother with fully potted ones, they are just for looks and worsen heat performance and are just heavy. I just get mine from Farnell. As far as VA rating goes, look up in the ZAPpulse cookbook to see what voltage you need for what power and load, then the VA you need is approx 1.37x the load power. Note this rule of thumb applies to class-d only. __________________ www.readresearch.co.uk my website for UK diy audio people - designs, PCBs, kits and more

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19th April 2005, 11:21 AM	#2
dhaen diyAudio Moderator Emeritus Join Date: Jun 2002 Location: U.K.	Hi, I think your question is rather broad. There is no "best for all". Is there a particular amplifier you are thinking of? John

19th April 2005, 11:29 AM	#4
Lou Cipher diyAudio Member Join Date: Mar 2005 Location: Stockholm	I'm going to use it in a ZAPpulse amplifier in a dual mono configuration i.e. one transformer for each channel.

20th April 2005, 10:40 AM	#5
Lou Cipher diyAudio Member Join Date: Mar 2005 Location: Stockholm	any advise??

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