December 2, 2006

12V Trigger AC Outlet

So I purchased a Behringer EP2500 and also a Behringer DCX2496. The EP2500 is rated at 9.7A, and the DCX2496 pulls approximately 12W. I'm assuming the 12W off a 120V line equals 0.1A. Grand total is 9.8A. However, the problem is both of these units do not have a trigger. You turn them on and then leave them on. I don't really want to do that since most of the time the home theater is off. There are some Xantech products that can help deal with this, but they're expensive. The cheap DIY solution is a relay switch.

One of my coworkers, Po Chiu, has a strong EE background. So I asked him if he knows that sort of box I need to build this 12V trigger so that when my processor turns on the AC outlet turns on as well. He explained the different types of switches to me. From there I found an article called How To Power Your MAME Cabinet. There are very simple instructions on that site for building your own relay switch.

So I went to OSH and Radio Shack and picked up about $20 in parts. With a wire stripper and soldering iron I was able to throw everything together in about 20 minutes. End result is a 12V trigger from my processor that will turn on a pair of regular AC outlets to power on the EP2500 and DCX2496.

My parts list is:
Radio Shack DPDT Plug-In Relay (Part #275-218)
Leviton 2-Pole, 3-Wire Grounding Duplex Receptacle (BR15-W)
Some sort of blue outlet box
Prime 3' Garbage Disposal Cord (Item #PS210603)
Some 16awg copper wire

The 16awg wire is only rated at 13A, and the DPDT relay is only rated 10A, but that's good enough to meet the 9.8A required by the EP2500 and DCX2496. Assuming those are the maximum current draw numbers, and not just nominal numbers.

Posted by josuah at December 2, 2006 6:54 AM UTC+00:00

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