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Old 19th October 2004, 07:23 PM   #1
kneadle is offline kneadle  United States
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Smile I built Jig II by Eric Wallin

I needed a jig, I needed to practice soldering, I needed to review my ability to read electronics schematics, and I needed to begin working on my website. Besides getting the diodes turned around on the first try, and besides having to substitute some resistance, it has been a great success. What a nice design! Here are the pics:



Special thanks to Eric Wallin for providing the plans online for anyone to use. Click the image to open in full size.


Click the image to open in full size.

Dave

PS--That's a box for a PCI card. Very sturdy.
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Old 19th October 2004, 08:10 PM   #2
Netlist is offline Netlist  Belgium
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Did you test it?
I also build that Jig but never took the time to fully explore
the possibilities with Speaker Workshop.
The biggest trouble I have is that I always forget what all these switching positions are for.

/Hugo
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Old 19th October 2004, 09:07 PM   #3
Kittle is offline Kittle  United States
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want to build me one?
I'll pay for parts & shipping....
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Old 19th October 2004, 09:11 PM   #4
Netlist is offline Netlist  Belgium
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Me?
No, it would cost you a fortune and I would spoil all the fun you
would have building it.

/Hugo
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Old 19th October 2004, 09:14 PM   #5
Stocker is offline Stocker  United States
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Default OK I'll bite...

And this does...?
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Old 19th October 2004, 09:30 PM   #6
Kittle is offline Kittle  United States
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Quote:
Originally posted by Netlist
Me?
No, it would cost you a fortune and I would spoil all the fun you
would have building it.

/Hugo

heh... ive already tried building one. 3 trips to radio shack for $40 in parts. Now all I have is various & sundry fried, soldered and half-soldered electronic parts kicking about. The whole experience was NOT my idea of fun.


how much of a fortune are you talking?
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Old 19th October 2004, 09:35 PM   #7
Ron E is offline Ron E  United States
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Default Re: OK I'll bite...

Quote:
Originally posted by Stocker
And this does...?
Do a web search for speaker workshop.
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Old 19th October 2004, 09:40 PM   #8
kneadle is offline kneadle  United States
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Default Re: Re: OK I'll bite...

Quote:
Originally posted by Ron E


Do a web search for speaker workshop.

See, I thought about trying to explain Jig II, but it, in itself, is a complicated thingy that goes with Speaker Workshop, which is also a complicated thingy of the software sort (free, too!). In short, put both together, and you can measure anything to your heart's delight with relative accuracy.

Right now I'm suffering through the calibration phase. My DMM says the Jig works, but my soundcard is pro-sumer style soundcard, and the resistance and output levels are somewhat different than defaults in SW. It's real pain, but there must be some gain...

Dave
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Old 19th October 2004, 09:59 PM   #9
kneadle is offline kneadle  United States
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Does anyone know the answer to this one? Eric Wallin has a site that walks you through the calibration process, and I'm thoroughly confused by the impedance calibration.
Quote:


If you know the input impedance of your soundcard, enter this here. If you don't know, use the defaults recommended in the SW help. After that, press the upper Test... button and then press the Next > button on the dialog that pops up. Enter the value of your 16 ohm calibration resistor and press the Next> button. Wait until the recording has stopped, then flick SW1 to the down position. Enter the value of your 4 ohm calibration resistor and press the Next > button. Now take a look at the ending dialog:
What is the "value of your 16ohm calibration resistor" if it's not 16? I don't get it. And the numbers I'm getting are whacked out. Big negatives and whatnot.

Dave

PS--here's the link

http://www.gti.net/wallin/audio/SW/c...comp_meas.html
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Old 20th October 2004, 12:40 AM   #10
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