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Note... you screw this up and it could damage stuff. Best needed a voltmeter some cutters, electrical tape and some solder & soldering gun if you want do this right.
The EMU 0404 USB is pretty nice. I know some of you are having problems with drivers and such but here let's look at the power supply.
Ok the EMU uses what is called 1.7mm connector into the device from the power supply. It requires 5V/1A and we would need a linear supply for this. I have found the increase in preformance of any of these device by a linear supply to be BIG, real BIG.
Anyways 1.7mm sucks because no one really uses this size connector. Most are 2.1, 2.5mm types.
Anyways what I did was hack off the EMU just below the ferrite bead, leaving enough wire to work with. The supply is center is + outside negative. So after stripping the two wires off the cable I used my meter to determine which was + and - and marked them with a silver sharpie.
Next I hacked off the 2.1mm connector on the Jameco stripped the wires and put my meter across the 2 wires, plugged it in and checked regulation and determined the + and - of the cable.
Next I wrapped the two positives together and the two negatives. Rechecked the power to see if everything was working. Plugged it into the emu and when I saw it worked. I then unplugged the new supply soldered up the wires and wrapped them well with some electrical tape and checked it out.
Inside is some nice stuff for the $. Sometimes amazes me what you can do with vol production.
J. Gordon Rankin
Wow, I just plugged a cheap DC "universal" adapter with a switch on the front 3v - 4.5v - 6v. It didn't like 6v much, but 4.5v seems to work fine, and unbelievable--I can hear the difference clearly! Listening to a bass line in this track by "The Knife" on the factory supply is--much hollower! These adapters all come with a variety of ends including the 1.7mm one.
I am a user of Emu 0404 usb. I am interested in changing the power plug.
The link for linear regulated power supply is not working.
I looked on the Jameco website but not sure which one to buy.
Can anyone help me?
Thanks a lot!
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:
As soon as I buy that, I discover that they have a table top one available:
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.
Thanks for your reply.
Since EMU 0404 USB needs 1.7*4mm head, how do you manage to connect to it?
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.
Can someone tell me what this Jameco PS offers that the standard factory-supplied PS does not ? I have an 0404 and very interested.
For what it is worth, I did a similar kind of thing to my EA Off-Ramp. I thought the linear supply gave the Off-Ramp a "smoother", more "natural" character. Whereas the stock switch-mode supply gave the Off-Ramp a "grainier" but seemingly more dynamic presentation and a bit more "space". So it is going to depend on where your system "is" as to whether the change improves things. Perhaps my experience is not relevant to the EMU; for one thing the EMU is also a DAC; others need to report as to what differences they perceive. Gordon, can you help in this regard?
This one works ["4.0x1.7mm Coaxial DC Power Plug (2-Pack)"] from Radio Shack:
Soldered one to the leads out of an RS 4xAA battery holder and tried to run my 0404 USB off freshly charged NiMH cells. It only ran for a few minutes before giving out, but at least I found that the above connector is compatible--no need to hack the existing switcher supply lead.
I am now a happy, a very happy, 0404 usb owner.
I want to do this upgrade, but I don't want to cut the cable. Have you found any suppliers for the 1.7mm connector?
I do not know if the US (does Radio Shack still has anything useful?). In the UK I got mine from Maplin. Down here I attach size and Maplin code.
Order Inside Outside Shaft
Code Diameter (mm) Diameter (mm) Length (mm)
L46AY 1.7 4 9.5
I hope it helps.
P.S. I run mine from a 12v sla battery with two stages of regulation. Could not be happier.
Unfortunately I don't know how to solder to make this work. Is it really that bad if you use an switcher?
Where can I get a switcher/adapter to convert from 2.1mm to 1.7mm (EMU)?
This sounds simple enough, but how easy is it for someone without soldering/electrical experience?
Gordon and others
There is no need to saw off anything. Buy a regulated supply with multiple plugs. Use the right one and solder your supply cable to it. That is it.
Unfortunately in UK one cannot buy an off the shelve 5V linear regulated supply. All one can get is Switching or 4.5V and 6V.
Fred the point was to not use a switcher!!!!!
J. Gordon Rankin
Agreed, I used a lab supply, but my post on connection holds. Alternatively, you can just cut off cable from Emu supply.
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