WTB: LDR-based volume control / pre

jdubs · 28th November 2010, 10:21 PM

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

john65b · 28th November 2010, 11:56 PM

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.

john65b · 02:20 AM

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.

john65b · 1st December 2010, 02:18 AM

LDR Based Volume Control sold.

Keeping my second one. Thanks

jdubs · 1st December 2010, 02:37 AM

Dang. You snooze, you lose, I guess. Still looking for an assembled unit or kit.

-Jim

EUVL · 1st December 2010, 03:09 AM

You should buy from Georgehifi.

It's his intellectual property.

jdubs · 1st December 2010, 03:15 AM

Quote:

Originally Posted by EUVL

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

jdubs · 2nd December 2010, 01:50 AM

Guys, I ended up ordering an OptiVol off of ska-audio.com. Can't beat the price.

Thanks again,
Jim

28th November 2010, 10:21 PM	#1
jdubs diyAudio Member Join Date: Jul 2004 Location: NYC	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

28th November 2010, 11:56 PM	#2
john65b diyAudio Member Join Date: Jan 2005 Location: Chicago	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. __________________ "I speak Spanish to God, Italian to Women, French to Men, and German to my Horse" - Charles V

1st December 2010, 02:18 AM	#4
john65b diyAudio Member Join Date: Jan 2005 Location: Chicago	LDR Based Volume Control sold. Keeping my second one. Thanks __________________ "I speak Spanish to God, Italian to Women, French to Men, and German to my Horse" - Charles V

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1st December 2010, 02:37 AM	#5
jdubs diyAudio Member Join Date: Jul 2004 Location: NYC	Dang. You snooze, you lose, I guess. Still looking for an assembled unit or kit. -Jim

1st December 2010, 03:09 AM	#6
EUVL diyAudio Member Join Date: Oct 2003	You should buy from Georgehifi. It's his intellectual property.

2nd December 2010, 01:50 AM	#8
jdubs diyAudio Member Join Date: Jul 2004 Location: NYC	Guys, I ended up ordering an OptiVol off of ska-audio.com. Can't beat the price. Thanks again, Jim

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