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Chip Amps Amplifiers based on integrated circuits

Newbie transformer question
Newbie transformer question
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Old 9th March 2004, 03:56 AM   #1
Lugoman is offline Lugoman  Kyrgyzstan
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Join Date: Mar 2004
Location: Alabama
Default Newbie transformer question

I have a transformer from an old amplifier that I would like to use in a gainclone. It has two sets of secondary outputs. One set consist of two green wires with a 20.25 volts ac between them and another set of two red wires and a yellow. The voltage between the two reds is 71.2 and the voltage between the yellow and each red is 35.5.

Is the center tap yellow wire the 0 volt line refered to in the gainclone faq? What is the difference between ground and the 0 volt line?

Is there anyway to use the 20.25 volt side that doesnt have the center tap in a gc amp? Is the 71.2 volt side to big?

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Old 9th March 2004, 10:20 PM   #2
ir is offline ir  New Zealand
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Join Date: Aug 2003
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Default Re: Newbie transformer question

yes the yellow is the centre tap. thing is tho, that gives you 35-0-35. after recifying it's going to be approximately +/-49Volts which is way too high. you should try to get hold of something between an 18-0-18 and 25-0-25 transformer

you can use the 20.25 supply if you built your amp as per the "single supply" schematic inthe datasheet. however this needs a lot more parts and makes it a tad more complex - i'm spretty sure it will affect sound quality too (not that much, but still, the amp won't be as pure as it could)
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