Chipamp PT question.

GloBug · 30th December 2011, 05:51 PM

Hey guys I am picking out a transformer from my junk pile for a LM3875 gainclone build.

Let's say I have a 220VA transformer that has multiple secondary voltages. (22-0-22, 13.8)

Can I draw the 220VA from the 22-0-22 winding if I don't use the remaining 13.8v winding?, or do I have to subtract the unknown VA of the 13.8v winging from the total VA?

I have it narrowed down to two transformers with a workable voltage.
One has slightly more VA then the other, but it also has more secondary windings. So I'm having a tough time choosing the best one for my build.

Here are the specs:

PT#1 -removed from 20wpc HarmonKardon hk330i
220VA 22-0-22, 13.8 volt secondaries.

PT#2 -removed from 30wpc Technics SA-222
260VA 27-0-27, 36, 5.8 volt secondaries.

Which do you think would deliver the most power using only the main center-tapped secondaries?

The voltage might be a secondary decision after I sort out this part.

Thanks for your time.

GloBug · 30th December 2011, 06:29 PM

Sorry about the double post, you can reply to this thread here.
Question about Transformer VA

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30th December 2011, 05:51 PM	#1
GloBug Banned Join Date: Jun 2011	Chipamp PT question. Hey guys I am picking out a transformer from my junk pile for a LM3875 gainclone build. Let's say I have a 220VA transformer that has multiple secondary voltages. (22-0-22, 13.8) Can I draw the 220VA from the 22-0-22 winding if I don't use the remaining 13.8v winding?, or do I have to subtract the unknown VA of the 13.8v winging from the total VA? I have it narrowed down to two transformers with a workable voltage. One has slightly more VA then the other, but it also has more secondary windings. So I'm having a tough time choosing the best one for my build. Here are the specs: PT#1 -removed from 20wpc HarmonKardon hk330i 220VA 22-0-22, 13.8 volt secondaries. PT#2 -removed from 30wpc Technics SA-222 260VA 27-0-27, 36, 5.8 volt secondaries. Which do you think would deliver the most power using only the main center-tapped secondaries? The voltage might be a secondary decision after I sort out this part. Thanks for your time.

30th December 2011, 06:29 PM	#2
GloBug Banned Join Date: Jun 2011	Sorry about the double post, you can reply to this thread here. Question about Transformer VA

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