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Old 28th November 2004, 01:24 AM   #1
diyAudio Member
Join Date: Jul 2004
Location: BC, Canada
Default My Speaker Workshop Rig

I've been at this for a couple days.. I got an old computer from work (PIII 550, 256MB RAM) And, I've been wanting to get a permanent speaker workshop setup going, instead of the pile of components, and aligator clip leads I've been using. So, using the cable diagrams at claudio negro's homepage, I've made a sort of jig that is right in the front of the computer. It contains wiring for a loop cable, has an impedance refrence resistor, along with two calibration resistors. It's also got the wiring for doing acoustic measurements. Next project is to add one of wallin's mic preamps to the rig.

I cut some holes in one of the 5 1/4" bay filler plates for the switches. Then, started wiring. Then, drilled the other filler plate for a pair of binding posts, and two 1/4" jacks. The jig was made with parts I had in my parts bin. The big white resistor is my refrence resistor. The calibration resistors are inline with some of the wiring in the zip tied bundles.

A little modification of the soundcard:
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After the majority of the wiring:
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Finished the wiring of the panels:
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Click the image to open in full size.

Installed in the computer:
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Taking my first Impedance Measurement with it:
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Click the image to open in full size.

It works great! Measures passive components extremely accurately, and I get TS parameters that seem correct. Next on the list is to build a measurement mic, build a wallin preamp, and put the preamp inside with the jig.
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