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In Reply to: RE: EMU 0404 power supply hack posted by asliman on April 03, 2009 at 15:34:29
I am pretty sure Gordon picked a linear regulated power supply.
Linear means that it isn't switching (varies the voltage quickly, doesn't matter in most applications). Regulated means that it stays at a specific voltage rather than providing voltage based on current draw.
He found one that was a 'table top' model, in other words it had an input cord that plugged into the outlet, a box for the circuitry, and then an output cord to go to the emu. You see them for laptops often.
Here are three links for wall wart type 5V/1A linear regulated power supplies:
http://www.jameco.com/webapp/wcs/stores/servlet/ProductDisplay?langId=-1&storeId=10001&catalogId=10001&productId=1953612&
http://www.jameco.com/webapp/wcs/stores/servlet/ProductDisplay?langId=-1&storeId=10001&catalogId=10001&productId=681571&
http://www.jameco.com/webapp/wcs/stores/servlet/ProductDisplay?langId=-1&storeId=10001&catalogId=10001&productId=168605&
Follow Ups:
As soon as I buy that, I discover that they have a table top one available:
http://www.jameco.com/webapp/wcs/stores/servlet/ProductDisplay?langId=-1&storeId=10001&catalogId=10001&productId=689661
Its got a DIN connector, not as straight forward as the other connector. You need to figure out what is the +5V/1A connection because there is a reverse polarity connection as well.
HI,
Thanks for your reply.
Since EMU 0404 USB needs 1.7*4mm head, how do you manage to connect to it?
Thanks.
Not sure totally, it would involve figuring out which wire was the +5V, which was the -5V, and which was the ground. Then, you should be able to just ignore the -5V.
I suppose, if you test the voltage between all the wires, you are going to get (at least) one combination that is a 10V difference. You know these are your +5 and -5. Mark them. Then find another wire that those two wires show a 5V difference, that must be ground. Then figure out polarity. Then solder to the connector.
I don't if three wires are in use, or all 5, that could complicate figuring it out, but its certainly doable.
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