Re-Jigging the jig: Speaker testing device for Arta, Speaker Workshop & HOLMImpulse - Page 8 - diyAudio
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Old 3rd January 2010, 08:09 PM   #71
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Quote:
Originally Posted by Ed LaFontaine View Post
Very nice!

...offer some boards? including the faceplate?

Thanks Ed,
It depends on how many are interested. I've had a couple members ask about it and also a few who have asked about the mic. I would be open to the idea, possibly even a short kit form with the specific parts included (jacks, switches) and enclosure for those that are interested.

I have updated the schematic, mainly to delete the dual grounds - this was a bad idea and not really needed:

ALL_IN_ONE_JIG_SCH.pdf
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Old 4th January 2010, 07:39 PM   #72
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I would be interested........
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Old 5th January 2010, 01:56 AM   #73
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Quote:
Originally Posted by katana2112 View Post
I would be interested........
Well, that's a start.
I'll see what I can come up with.

It was bugging me how I mounted the chipamp near the centre of the board, so I took a few minutes to relocate it to the back of the board. This way it can be attached to the rear of the box for heat sinking.

117.PNG

The pdf of the copper bottom is coming soon.
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Old 10th January 2010, 04:42 AM   #74
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Another revision, moved some traces and added a bypass cap at the AC in:

117.PNG

I've been using the one I've built to do some frequency response tests. I set the amp to output 2.83Vrms by adjusting VR1 while the sine signal was playing from Speaker Workshop with no load. This is 1 watt into 8 ohms but wow, was it loud! It startled me a bit when I ran the test.
I also gave Holm Impulse a try and that program is nice too - easy to use but lacks most of the functionality of SW.
It's stunning just how accurate SW is for measuring passive components. I measured a bunch of power resistors - .1 ohm, .33 ohm, etc and it was dead on (within the tolerance of the part). Caps and inductors with the ability to measure inductance being a huge bonus, it was bang on.
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Old 10th January 2010, 06:16 AM   #75
Variac is offline Variac  United States
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Quote:
Originally Posted by katana2112 View Post
I would be interested........
I think there will be a LOT of interest in this..
ummmmmm like from me...

Mark
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Old 10th January 2010, 06:22 AM   #76
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I'd be interested in a board if you're getting a batch done. If not the Gerbers would be great if possible when you're happy with them, and I'll get one made here.
I was searching for just such a jig design when I found this thread so am very pleased as it saves me a lot of work.
Cheers
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Old 10th January 2010, 04:01 PM   #77
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Note interest here, too.
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Tim
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Old 10th January 2010, 07:45 PM   #78
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Default I would order one also

Plus it would be nice to have alternatives like a pot for fine tuning the gain level and output to the speakers.
I was thing of putting a 10k pot to be able to adjust or down up the feed back resistor loop to to the mic pre amp op amp and if there are any better amp
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Old 10th January 2010, 09:12 PM   #79
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Quote:
Originally Posted by Variac View Post
I think there will be a LOT of interest in this..
ummmmmm like from me...

Mark
I see there is some interest.
Ok, I'll get something rolling.
But first I need to try out the new board:

NPX_026.JPG

I just etched, tinned and drilled it. If this layout works well I'll put together a board order.
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Old 10th January 2010, 09:20 PM   #80
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Quote:
Originally Posted by mcmahon48 View Post
Plus it would be nice to have alternatives like a pot for fine tuning the gain level and output to the speakers.
I was thing of putting a 10k pot to be able to adjust or down up the feed back resistor loop to to the mic pre amp op amp and if there are any better amp
It has a level setting pot on the board (see schematic).
If you mean better than the TDA2030, the board will straight up take an LM1875 without a problem - they are the same pin out. In fact, that's what is in the one I'm using.
This jig is mean to be used with a mic with a separate preamp, or one like mine - it has the preamp inside:

_129.JPG

I re-did it that way in order to use the jig to test amps through an attenuator (that I'll get to eventually). Having the mic preamp in the jig was a good idea but puts too many limitations on its functionality.
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