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Old 28th November 2010, 10:21 PM   #1
jdubs is offline jdubs  United States
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Default WTB: LDR-based volume control / pre

Hey guys

Looking to buy one of these, either kit or assembled. If you have one you are looking to sell please shoot me a note with the details.

Thanks!
Jim
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Old 28th November 2010, 11:56 PM   #2
john65b is offline john65b  United States
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I have one. I did not do a very intensive job matching the LDR's, but she works fine. $50 + shipping and its yours. I have another and don't really need two. Currently in a clear plastic case, and runs off a 9V battery.
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Old 30th November 2010, 02:12 AM   #3
john65b is offline john65b  United States
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OK. Pic is below. It was my first implementation a few years ago, and I have another that was a little more cleaner (on a PCB) that I want to keep. It is powered off a 9V battery and dropped to 5V via a 7805 regulator. It is a single pot design. Its a bit of a rat's nest, but sounds very clean - no hiss or hum. You can also use a 12V wallwart, but since there is no sink on the 7805, may get a little hot.

The first quarter turn from 6:00 to 9:00 does nothing as far as attenuation, but then both channels tracks pretty close after 9:00 all the way to full volume. As you know, there is no gain on this volume control.

Probably a good candidate for a re-house into something a little nicer.
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File Type: jpg P1010010.JPG (670.0 KB, 116 views)
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Old 1st December 2010, 02:18 AM   #4
john65b is offline john65b  United States
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LDR Based Volume Control sold.

Keeping my second one. Thanks
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All right, but apart from the sanitation, medicine, education, wine, public order, irrigation, roads, the fresh water system and public health, what have the Romans ever done for us? Life of Brian
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Old 1st December 2010, 02:37 AM   #5
jdubs is offline jdubs  United States
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Dang. You snooze, you lose, I guess. Still looking for an assembled unit or kit.

-Jim
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Old 1st December 2010, 03:09 AM   #6
EUVL is offline EUVL  Europe
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You should buy from Georgehifi.

It's his intellectual property.
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Old 1st December 2010, 03:15 AM   #7
jdubs is offline jdubs  United States
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Quote:
Originally Posted by EUVL View Post
You should buy from Georgehifi.

It's his intellectual property.
Huh? I thought he signed off on the group buy boards that are being produced.

-Jim
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Old 2nd December 2010, 01:50 AM   #8
jdubs is offline jdubs  United States
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Guys, I ended up ordering an OptiVol off of ska-audio.com. Can't beat the price.

Thanks again,
Jim
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