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E90 power supply

post #1 of 5
3/5/10 at 6:39am
Thread Starter 
I'm wondering if anyone could tell me what voltages the E90 amp can tolerate. I see that the stock wall-wart is a 9V 1A and lots of people seem to use a 12V power supply, but I've only got a 13.7V 2.2A power supply here to use. I have no idea what the guts of the amp is rated for although I've been using it with the 13.7V for a few days and there's been no issues. Is it pretty safe or should I buy a different supply?
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post #2 of 5
3/5/10 at 11:56am
WTF is an E90 amp? When you ask questions like this, you should provide a link or links so that people who don't know what you are talking about don't have to go research it.

A device will only draw the current it needs, so going higher on the current rating as you did shouldn't hurt it. If the amp has internal voltage regulator(s), going higher on the voltage will cause them to have to drop more voltage across them, resulting in heat. The regulators should still regulate the voltage to whatever they are designed for; they'll just run hotter doing it.
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post #3 of 5
3/5/10 at 3:04pm
That would be the Koss E90. Buy the proper wall wart, or use battery power. Be safe.
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post #4 of 5
3/5/10 at 5:17pm
Yes, The E90 uses a 9V wallwart. However, the filter caps inside the E90 itself are only 10V caps. I went into mine and replaced the caps with 16V ratings, and ran a 12V regulated bench supply in place of the wallwart. I personally wouldn't run over 10V or so (although some have), if you're not able to change the E90 internal filter caps, which involves tearing the E90 apart. By the way, The E90 is a bit of a pain to get apart, but can be done.
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post #5 of 5
3/5/10 at 9:57pm
Thread Starter 
Quote:
Originally Posted by audionut View Post
Yes, The E90 uses a 9V wallwart. However, the filter caps inside the E90 itself are only 10V caps. I went into mine and replaced the caps with 16V ratings, and ran a 12V regulated bench supply in place of the wallwart. I personally wouldn't run over 10V or so (although some have), if you're not able to change the E90 internal filter caps, which involves tearing the E90 apart. By the way, The E90 is a bit of a pain to get apart, but can be done.
Thank you very much, this clears up a lot. I guess I'll go order another power supply.
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