Duet wall wart replacement?

jholtz · « **on:** 13 Feb 2009, 02:27 pm »

I know Wayne offers exceptional solutions but they are out of my budget. Are there any inexpensive linear power supplies available for the Duet?

Thanks!

Jim

mr_bill · « **Reply #1 on:** 13 Feb 2009, 02:30 pm »

Search AC for Acopian and you'll find one.

MerlinWerks · « **Reply #2 on:** 13 Feb 2009, 02:43 pm »

Any DIY suggestions???

woodsyi · « **Reply #3 on:** 13 Feb 2009, 02:54 pm »

http://cgi.ebay.com/HP-6289A-DC-Power-Supply-30-Day-WARRANTY_W0QQitemZ220359038410QQcmdZViewItemQQptZLH_DefaultDomain_0?hash=item220359038410&_trksid=p3286.c0.m14&_trkparms=72%3A1205|66%3A2|65%3A12|39%3A1|240%3A1318|301%3A1|293%3A1|294%3A50

Performance falls just short of Ultimate Power Supply.

jholtz · « **Reply #4 on:** 13 Feb 2009, 05:30 pm »

Thanks for the replies guys. I had an Acopian power supply on my SB3 and it worked well. However, I believe some folks were coming up with solutions that were very similar for around $20 if I remember correctly. Since I've moved to a Duet system, I thought perhaps there might be a real "economy" solution for the Duet as well.

Jim

mgalusha · « **Reply #5 on:** 13 Feb 2009, 06:07 pm »

Quote from: woodsyi on 13 Feb 2009, 02:54 pm

http://cgi.ebay.com/HP-6289A-DC-Power-Supply-30-Day-WARRANTY_W0QQitemZ220359038410QQcmdZViewItemQQptZLH_DefaultDomain_0?hash=item220359038410&_trksid=p3286.c0.m14&_trkparms=72%3A1205|66%3A2|65%3A12|39%3A1|240%3A1318|301%3A1|293%3A1|294%3A50

Performance falls just short of Ultimate Power Supply.

Thanks for the link Rim, I picked one up for my bench.

woodsyi · « **Reply #6 on:** 13 Feb 2009, 06:28 pm »

Quote from: mgalusha on 13 Feb 2009, 06:07 pm

Thanks for the link Rim, I picked one up for my bench.

Why you are welcome, Mike. These things are really handy little buggers and on the cheap too.

I have to give doug s. credit for introducing me to them.

Wayne1 · « **Reply #7 on:** 13 Feb 2009, 06:37 pm »

The Acopian power supplies are not a plug and play solution. They do require you to wire an AC cable and a DC cable to them. The terminals for the cables are exposed.

I am not aware of any 9 volt, 1-1.5 amp, ready to work, surplus power supply. For the SB2 and 3 there were lots of surplus power supplies designed for 5 volts at 2 amps.

If anyone can find anything 9 volt DC with at least 1 amp, I would be very interested in trying one.

To my knowledge, the least expensive, ready to use PS for the DUET is made by Channel Islands Audio for $280.00.

Dusty sent me one to try some time ago. It is very well built and sounds quite a bit better than the stock supply, IMHO.

I also think the one I make sounds better, but it is more expensive

Bob in St. Louis · « **Reply #8 on:** 13 Feb 2009, 07:12 pm »

How 'bout THIS?

woodsyi · « **Reply #9 on:** 13 Feb 2009, 07:17 pm »

How spikey do you want your DC voltage?

Quote

* AC to DC power adapter output voltage: 9V DC
* output current: 1000 ma max. (1A)
* input power: 115Vac / 60Hz
* thermal cutoff
* non-regulated
* short-circuit protection
* DC output plug size: 0.22" / 0.08" (5.5 / 2.1mm) (+) center
* power adapter cord length: 6ft (1.85m)

Bob in St. Louis · « **Reply #10 on:** 13 Feb 2009, 07:26 pm »

Whoops, sorry about that.
I think I got excited when I finally found one that's 9V-1A and wasn't a switcher, I must've ignored the rest of it.

Bob

Bob in St. Louis · « **Reply #11 on:** 13 Feb 2009, 07:32 pm »

Ok last one, then I'm finished; HERE.

Bob

jholtz · « **Reply #12 on:** 13 Feb 2009, 07:44 pm »

Quote from: Bob in St. Louis on 13 Feb 2009, 07:32 pm

Ok last one, then I'm finished; HERE.

Bob

Hi Bob,

I believe this is also a non regulated switching power supply so it wouldn't be any better than the one that came with the Duet.

I have found some reasonably priced regulated 9V power supplies in the pro music world but they're rated in milli amps and I'm not sure how .5 amps converts to milli amps.

Jim

jman66 · « **Reply #13 on:** 13 Feb 2009, 07:48 pm »

.5 amps = 500 mA

jholtz · « **Reply #14 on:** 13 Feb 2009, 08:03 pm »

Quote from: jman66 on 13 Feb 2009, 07:48 pm

.5 amps = 500 mA

I just figured that out before your post. Thank you for clarifying it!

Jim

Bob in St. Louis · « **Reply #15 on:** 13 Feb 2009, 08:04 pm »

Wayne was looking for 1 amp (1000mA), so the 500/.5 isn't enough.

BradJudy · « **Reply #16 on:** 13 Feb 2009, 08:18 pm »

Quote from: MerlinWerks on 13 Feb 2009, 02:43 pm

Any DIY suggestions???

There are various DIY options out there. In addition to schematics for various regulators on DIYAudio's site (search for teddy or shunt regulators), there are some PCB options for nice power supplies on these sites (both good guys):

This guy is kind of between designs at the moment, but boards for his Jung power supply should be available soon, I'm currently using one of his STEPS supplies. He also has a basic "TREAD" LM317 regulator that he sells in kit form (minus transformer/case) for $17, but you'd need to sub parts for 9v operation. - http://tangentsoft.net/elec/

Here's another PCB option from a good place - http://www.amb.org/audio/sigma11/

For either of the above, you'll have to pick and order parts for the appropriate output voltage.

Welbourne labs makes a kit that they will assemble for you as well, but will cost you more than the CI one assembled. I have dealt with them in the past without any problems, but some people have had trouble with a lack of responses from them, so YMMV - http://www.welbornelabs.com/squeeze.htm

Quiet Earth · « **Reply #17 on:** 19 Feb 2009, 02:32 am »

Try a web search for MASTECH 18V 3A HY1803D. A few places are selling these variable DC power supplies brand new for $69.95. It's an adjustable, linear DC power supply with voltage/current meters and will supply 3 amps. It looks kind of cheap, but it's not a switching power supply. I must confess that I have never tried one. It just looks like a reasonable deal.

I picked up a brand new Acopian 15V power supply (3amp capacity) for 15 dollars on the bay. Then I built my own 9V regulator board and wired it between the Acopian and the duet receiver. I just finished this little project yesterday and I really had fun doing it. The regulator heat sink feels a little hot if you squeeze it hard, but I think that it will be OK in the long run. (Its a 1 amp 9 volt LDO regulator and the duet draws 550mA.)

This brings me to a question about the duet receiver power supply voltage :

Does it have to be 9 volts coming in or will it work with a higher DC voltage?

The reason why I ask is because I have seen pictures of the internals of the receiver on the net, and someone mentioned that it already has 3 voltage regulators on board. So,,,,,,,, in other words, I don't want to regulate to exactly 9V if it's not necessary.

Sorry to highjack the thread . . .

I hope someone can answer.

mr_bill · « **Reply #18 on:** 19 Feb 2009, 05:06 am »

Buy the Acopian and strip a power cord and DC cord and hook it up - it's easy and Acopian has the exact match in amperage that you need.

Quiet Earth · « **Reply #19 on:** 19 Feb 2009, 03:11 pm »

Yes, it's easy. But it may be expensive.

I think a brand new 9Volt, 1 to 2 amp, regulated Acopian will cost more than the duet receiver. I suppose you might be lucky enough to find one on e'bay, but I haven't seen one yet. (Although, I haven't been looking that long for one.)

The reason I got a 15V Acopian so cheap is because no one else bid on it.