Transformer deal???

gcnewbie · 21st April 2005, 06:03 PM

I can get some AVEL transformers that don't exactly match the recommendations I've read on this board and elsewhere, but still wanted to get people's opinions on whether either was suitable in an LM3875 based amp?

Option 1 is 150Va, 2x28.4V, 2.67A
Option 2 is 100Va, 2x25V, 2.00A

Any opinions as to their suitability?

Nuuk · 21st April 2005, 08:13 PM

25 VAC is the maximum that you can use with the LM3875 unless you are regulating the supply and dropping the voltage.

100VA is a bit low for two channels but it depends how much power you need, ie what speakers you are using with the GC. One transformer per channel would be better.

gcnewbie · 21st April 2005, 09:38 PM

Is there a recommended amperage range as well?

Greg Erskine · 21st April 2005, 10:06 PM

Hi gcnewbie,

100Va = 2x25V x 2.00A

Hope this answers your question.

21st April 2005, 06:03 PM	#1
gcnewbie diyAudio Member Join Date: Apr 2005 Location: Pasadena, CA	Transformer deal??? I can get some AVEL transformers that don't exactly match the recommendations I've read on this board and elsewhere, but still wanted to get people's opinions on whether either was suitable in an LM3875 based amp? Option 1 is 150Va, 2x28.4V, 2.67A Option 2 is 100Va, 2x25V, 2.00A Any opinions as to their suitability?

21st April 2005, 08:13 PM	#2
Nuuk diyAudio Member Join Date: Feb 2003 Location: Somerset, SW England	25 VAC is the maximum that you can use with the LM3875 unless you are regulating the supply and dropping the voltage. 100VA is a bit low for two channels but it depends how much power you need, ie what speakers you are using with the GC. One transformer per channel would be better. __________________ The truth need not be veiled, for it veils itself from the eyes of the ignorant.

21st April 2005, 09:38 PM	#3
gcnewbie diyAudio Member Join Date: Apr 2005 Location: Pasadena, CA	Amperage? Is there a recommended amperage range as well?

21st April 2005, 10:06 PM	#4
Greg Erskine diyAudio Member Join Date: Jan 2002 Location: Sydney/Australia	Hi gcnewbie, 100Va = 2x25V x 2.00A Hope this answers your question. __________________ Greg Erskine

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