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Author Topic: Recycled trannies useful??  (Read 2622 times)

iTzALLgoOD

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Recycled trannies useful??
« on: December 05, 2007, 07:06:02 PM »
I got a hold of a couple of battery back-up (the ones for your computer) transformers.  I'm guessing that they are 12-14 volt and maybe 7-10 amp.  Would this be something that I could use for a chipamp?  I am only a little bit familiar with power supply's.  Is it possible to build a suitable power supply with a simple but beefy transformer?  Thanks for any info.  John

joecool85

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Re: Recycled trannies useful??
« Reply #1 on: December 06, 2007, 07:05:22 AM »
Well, yes, "simple but beefy transformer(s)" are useful for building amps with.  That said, I don't think you will be able to use a transformer only kicking out 12-14v.  After rectification you would be right around +/-10v, which is enough to power a LM1875, but only to 4-5 watts (maximum power output is 30watts using +/-30v).  You could tie two or more transformers together to get higher voltage though.
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iTzALLgoOD

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Re: Recycled trannies useful??
« Reply #2 on: December 06, 2007, 02:03:20 PM »
What about a voltage doubling circuit.  I should still have enough amperage. Or are those a bad idea for audio applications.  Either way I do have 2 of them.

joecool85

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Re: Recycled trannies useful??
« Reply #3 on: December 06, 2007, 02:12:39 PM »
What about a voltage doubling circuit.  I should still have enough amperage. Or are those a bad idea for audio applications.  Either way I do have 2 of them.

I'm going to guess a voltage doubling circuit would add noise to the amp, also it complicates the amp building quite a bit.
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