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Old 15th March 2006, 10:53 PM   #21
paulb is offline paulb  Canada
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Location: Calgary
We've got a few of the LM4752 boards I mentioned earlier in this thread. Not fully tested yet, but it's coming along. They include a differential input stage; we're running differential audio into our lab using CAT-5/RJ-45.
I'm attaching a schematic. If anyone is interested in purchasing blank boards (not sure what the price will be) let me know.
A matching transmitter board and RJ-45 distribution panel are also in the works.
Attached Files
File Type: pdf rxboxschematic.pdf (57.9 KB, 50 views)
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Old 16th March 2006, 02:46 AM   #22
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We start our little project tomorrow night. I have all the parts and the project board proto worked great. The kids are excited to build it. We secured power supplies from a guy on Ebay. When he found out the project was for Scouts he sent them up for only the cost of postage... 14VDC, 1.4 Amps. Just perfect. Sounds good, perfect for amping up an MP3 player.
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Old 16th March 2006, 04:59 AM   #23
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Location: Wisconsin....what did you expect?
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Link, please? I would'nt mind buying one to make a portable speaker. (And I have little doubt that the guy selling them would mind the sales, either.)

Come to think of it, these would work great with four 14.4 volt lithium-ion cells. And, using my laptop, I'd have a nice little source of sound.

Also, I wonder how they compare to a "proper" chip-amp? These might be a low-powered option for running off of one transformer; the total cost could be kept REALLY low.
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Old 16th March 2006, 02:23 PM   #24
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Here's the seller's store on Ebay.

Nice guy. Fair shipping prices.

http://stores.ebay.com/Daves-surplus...QQftidZ2QQtZkm
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Old 16th March 2006, 06:23 PM   #25
paulb is offline paulb  Canada
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Here's another. Lots of these DC wallwarts floating around.
http://www.bgmicro.com/prodinfo.asp?prodid=PWR1049
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Old 16th March 2006, 06:44 PM   #26
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The link seems to be dead; I can't see any kits for anything.
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Old 16th March 2006, 07:13 PM   #27
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From the ebay site...

Seller is ON VACATION from 3/14 thru 3/19.
No one will be available to ship or answer questions.
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