Speaker Testing Jig Assembly Thread - Page 2 - diyAudio
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Old 25th February 2010, 11:05 PM   #11
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Old 3rd March 2010, 03:44 PM   #12
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Hi,
Could you post one closeup/medium-hires picture of the assembled board so that we (who don't remember resistor color band coding) can go by your picture to place the appropriate resistors in their correct spots? I can somewhat see from the picture you already posted, but some are not quite clear...

Thanks!

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Old 3rd March 2010, 06:28 PM   #13
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Hi critofur,
Like I said here:
Quote:
Originally Posted by MJL21193 View Post
The resistors are not marked and it is best to measure them with a multimeter anyway before installing them.
It is always a good idea to actually measure the resistors before placing them. I do this on everything I make.

I'll post a pic a bit latter. I don't have one on file.
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Old 3rd March 2010, 06:47 PM   #14
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I had misplaced my meter, found it now I'm good to go... I'll measure, like you recommend.

Cool - the 30s are 30.0 Guess my meter is only good to three digits. Shows how much I know about DMMs... The 1K shows 1.000 K.

The 68K measures 67.8 - is there any need to make note of that value - I'm guessing it's not used in a position that will affect calibration (but I don't know, didn't go through the circuit diagram to see what that one is doing).
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Last edited by critofur; 3rd March 2010 at 07:02 PM.
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Old 3rd March 2010, 07:15 PM   #15
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All of the resistors are 1% tolerance and accuracy isn't critical, no need to note the actual values.

The three 30 ohm resistors paralleled should give a very accurate 10 ohms - this exact value is needed for later calibration.
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Old 3rd March 2010, 07:45 PM   #16
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Quote:
Originally Posted by MJL21193 View Post
The three 30 ohm resistors paralleled should give a very accurate 10 ohms - this exact value is needed for later calibration.
I assumed that's why you used three, and that they are used as the 10.0 Ohm resistor used both for calibration, and, for impedance measurements - is it not used for impedance?

Is the other triplet done for increased power handling?
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Old 4th March 2010, 03:19 AM   #17
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Ok, I've finished building the board, all that's left is to paint the case...

Quote:
Originally Posted by MJL21193 View Post
...Connect a suitable AC power adapter (12-24VAC, 1 amp) and turn it on..
I just realized - all my power supplies are DC. The recent technology switching power supplies (much lighter "wall warts") - do you think those come in AC?

Any suggestions on which power supply choices would be good / good value?

Hope to try this sucker soon.

Thanks,

Chris

EDIT: How about this? http://cgi.ebay.com/ws/eBayISAPI.dll...m=200416808189

Last edited by critofur; 4th March 2010 at 03:22 AM.
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Old 4th March 2010, 12:07 PM   #18
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Quote:
Originally Posted by critofur View Post
I assumed that's why you used three, and that they are used as the 10.0 Ohm resistor used both for calibration, and, for impedance measurements - is it not used for impedance?
The paralleled 30 ohm resistors make up the internal "known" load of the jig.
I'll go through calibration for Speaker Workshop (to measure driver impedance and other specs) in a new thread that I'll start soon.

Quote:
Originally Posted by critofur View Post
I just realized - all my power supplies are DC. The recent technology switching power supplies (much lighter "wall warts") - do you think those come in AC?

Any suggestions on which power supply choices would be good / good value?


EDIT: How about this? HP C4557-60004 AC ADAPTER +18V 1.7A WARRANTY 30 DAYS - eBay (item 200416808189 end time Mar-10-10 16:43:33 PST)
The adapter you linked to is not AC output either.
The one I used is this one: AC to AC adapter 12VAC, 1Amp
I made a mistake earlier when I said 12-24VAC, it should be 12 to 16VAC, 1 amp. The power supply smoothing cap is rated to 25V. The jig operates perfectly on 12VAC at 1 amp and that is the voltage I recommend.
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Old 4th March 2010, 11:08 PM   #19
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Hmm, that one doesn't come with a plug, but this one does:

Click the image to open in full size.
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Old 4th March 2010, 11:12 PM   #20
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Perfect!
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