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Chip Amps Amplifiers based on integrated circuits

Yet another transformer question....
Yet another transformer question....
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Old 5th January 2007, 11:54 PM   #1
dbailey is offline dbailey  Canada
diyAudio Member
Join Date: Feb 2005
Location: Ontario
Default Yet another transformer question....

I have a Plitron toroid transformer with a 117 VAC primary and dual 25 VAC secondaries. The transformer is rated at 300 VA.

Tonight I connected the transformer to power and made some quick measurements. My input measured 122 VAC and my secondaries measured 27.4 VAC each.

I would like to use this transformer with one of Peter Daniel's LM3875 kits and a pair of Energy C-3 speakers which I believe are 8 ohms. Eventually I may migrate to a single driver speaker setup.

My question is this: is my transformer suitable for use with this CG kit and these speakers.

Thanks in advance for answering my question.

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Old 6th January 2007, 10:29 PM   #2
elaar is offline elaar  United Kingdom
diyAudio Member
Join Date: Oct 2005

yes that transformer is fine. Remember you're measuring the transformer with no load, so with a 300VA transformer you probably have around a 7-10% regulation, hence your reading of 27.4. Your input measuring 122 (rather than 117) isn't a problem.

Anything over 35v (which is perfect for your 8ohm speakers by the way) will be dissipated as heat, so make sure you have a good heatsink(s)(read the LM3785 docs).

I don't know much about your speakers, but assuming they are 8 ohms and have no nasty characteristics, then your transformer and amp kit will cope just fine.

Hope this helps,
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