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Old 6th November 2006, 01:41 AM   #11
Fin is offline Fin
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How good would these be for the SI T-Amp?

Swithchmode PS on eBay Australia

If anyone is interested, I could buy then and forward them on to you.
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Old 6th November 2006, 02:45 AM   #12
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will a better power supply give me more bass? I am using a 1A one
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Old 6th November 2006, 02:50 AM   #13
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From what I've read you really need more than 1.5 Amps and above 2A is even better. Apparently it does help the bass and so does a large stiffener cap - but the real cure for the lack of bass is to replace the two input caps with larger ones (up to 2.2uF).
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Old 6th November 2006, 02:50 AM   #14
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Default Appropriate power?

Fin,
This supply is rated up to 40 watts which means it can put out just short of 3 amps continuous. This is enough to run 2 SI's easily. It is physically quite a bit bigger than the 2" X 4" supplies I use. If it will fit in the case you plan on using I see no problem in giving it a try. I would recommend a bulk storage cap of 10,000 to 20,000uf near the amp circuit. Run the supply leads to this cap first then on from it to the amp. Twist the leads!
If the supply makes an audible chirping kind of noise this should be correctable by putting a load resistor right on its output pins. Use a 10 watt res of around 36 ohms. Running it at 5 watts should insure long life. It should be better without this res, if you donít need it, donít use it. This is due to the increased ripple current generating additional noise.
Roger

Wow, you guys are too fast for me!
A 15 watt supply will cover all the power the amp can put out long term. Most of these supplies will put out 20 watts or so short term so more is not needed. A smaller supply run at what it was designed to provide will perform better than a larger supply utilized to only a fraction of its capabilities. It will have lower noise and probably better regulation as well. Lots of variables here so canít state this as absolute fact in all cases.
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Old 6th November 2006, 02:56 AM   #15
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Hi sx881663

Thanks for that. I might buy a few and this low price. They could be usefull for future projects too.
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Old 6th November 2006, 07:01 PM   #16
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Shootz! At that price, buy several. Hard to go wrong.
Just be careful boxing it up. Mains voltage and all.
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Old 7th November 2006, 12:20 AM   #17
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Thanks Michael

I will get some.
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Old 7th November 2006, 11:43 PM   #18
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OK - well I just ordered four of these power supplies. The seller says he will be happy to do a special price if anyone is interested in a bulk buy. I didn't think that the price could get any better than $5.20AUD = $3.50US!!!
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