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Old 5th February 2003, 05:12 AM   #1
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Default Anything I can use for DIY amp from PC powersupplies?

I'm starting probably the wrong side of things by asking this question before I even have a basic understanding of building an amp but I would like to know if I could make it extremely cheap by parting out old powersupplies. Is this possible? I work at computer renassaince so it's easy to grab parts from these. What do you think?
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Old 5th February 2003, 05:26 AM   #2
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I'd suspect the power switching MOSFET would be perfect. Might be able to use the diodes for 12V supply for a similarly low-voltage supply with low switching noise (they have to switch very fast, so switching noise from the diodes turning on&off will be to a minimum at 60Hz).
They usually have a 78xx or 79xx type regulator inside, might use one of those for a low-level supply (for preamp/gain stages, etc...).

That's about all I can think of in my tired state. HTH!

Tim
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Old 5th February 2003, 06:09 AM   #3
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Don't over look some good grade caps and inductors, no big boys but could prove usefull...
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Old 5th February 2003, 01:11 PM   #4
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actually the inductors in a PC power supply are pretty robust -- don't forget that these are designed for hundreds of watts. You also have EMI filters etc. I wouldn't bother with the diodes and transistors -- not worth the time unsoldering them.

I have used inductors from PC supplies to make switching supplies -- my LM3875 (was/is) in the old MB used the core from a PC power supply -- and the entire thing is encased in a PC Power Supply case -- you have to "characterize" the core first -- in order to know the turns etc. (Do you really want me to get into this, a geek at UCBerkeley told me how about 5 years ago).
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Old 5th February 2003, 02:24 PM   #5
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Default I'd suspect the power switching MOSFET would be perfect

The old PSU's that I've taken apart have all used BJT's for the switching transisters rather than MOSFET's , but thats not to say that the more modern ones don't.

FWIW , the ones that I took out ( old AT PSU's ) were 2SC2625's and are nice TO247 high voltage breakdown devices ( 400-450v ) , but only handle about 80W .
I've used them in a car ignition controller, and they handle the coil voltages fine , although they do have a typically low hfe of about 10.

The high voltage caps are nice too , and the ferrites are also useful.

problem is that the best project for all these parts is SMPS....



ray
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Old 5th February 2003, 02:33 PM   #6
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Don't forget the heat sinks.
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Old 6th February 2003, 01:02 AM   #7
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And a fan... lol.. Power conmnectors, a switch (or 2) and the actual transformer would be good for a switchmode powersupply if it was rewound.... or, you could even just add windings to it to run an amplifier from teh switchmode powersupply..
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Old 6th February 2003, 01:18 AM   #8
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And the case itself can be used for somthing else.
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Old 6th February 2003, 01:22 AM   #9
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Quote:
Originally posted by JBL
And the case itself can be used for somthing else.

Yes, but sadly a 7.2AH sealed lead-acid battery is about 2mm too wide to fit in one..
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Old 6th February 2003, 01:30 AM   #10
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I would use the complete powersupply, Just take some of them, put them in series for enough voltage, and use as amp powersupply. 2 (12V+12V)should be enough for a OPA548 /549/544 etc amp.
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