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120v 60hz 2.5a Transformer
120v 60hz 2.5a Transformer
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Old 23rd August 2012, 02:23 AM   #1
NEAWD is offline NEAWD
diyAudio Member
Join Date: Jul 2012
Default 120v 60hz 2.5a Transformer

Hi, this is my first post on here.

I recently sourced a transformer from a Sherwood RX-4109 that is rated at 120v 60hz 2.5a, and I'm wondering if this would be suitable for my LM3886 build. It's a simple stereo setup with 1 PSB and 2 amp boards. Thanks in advance guys.
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Old 23rd August 2012, 10:36 AM   #2
AndrewT is offline AndrewT  Scotland
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Join Date: Jul 2004
Location: Scottish Borders
2.5Aac & 120Vac gives ~300VA.
That would indicate a much bigger amplifier than 60W+60W into 8ohms.

The 3886 has a +-42Vdc maximum supply voltage.

Your transformer must not give out more than 28Vac -0- 28Vac when open circuit secondary and the mains voltage is at your nominal supply voltage.

If it is >28Vac you are likely to blow up your 3886 chips.
regards Andrew T.
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Old 25th August 2012, 03:24 PM   #3
NEAWD is offline NEAWD
diyAudio Member
Join Date: Jul 2012
Thanks for the reply. That's what I suspected. I'm going to stick with a 22-0-22 300va toroidal for this project.
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