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Gadget Freak

Gadget Freak Case #192: The Ultimate Wireless Volume Control

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armorris
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Platinum
Re: Additional info
armorris   10/11/2012 2:21:35 PM
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It has to be an amplified speaker system connected to the TV (i.e. line-level or headphone-level signals). The volume control cannot control the speakers directly. If it is a line-level signal, delete the 100 ohm resistors at the input.

I built two remote volume controls and one of them is connected to a TV volume regulator, which has a line-level output. If the remote volume control is being connected to a headphone jack, the 100 ohm resistors are needed to allow the TV, or whatever, to sense the load and switch its internal speakers off. Most electronics nowadays use electronic means to detect a load on the headphone jack and switch off the built-in speakers. Gone are the days of having a mechanical switch in the headphone jack.

dgrant
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Iron
Re: Additional info
dgrant   10/11/2012 2:32:20 PM
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Great, thanks for the heads-up. I will have to remove the 100 ohm resistors because I will be connecting to the line-level outputs of a TV.

dgrant
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Iron
Enclosure
dgrant   10/11/2012 2:39:52 PM
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Is that a Hammond enclosure?

armorris
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Platinum
Re: Enclosure
armorris   10/11/2012 3:04:15 PM
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No, It's not a Hammond enclosure. It's Radio Shack 270-1803. The link I sent you earlier has the part numbers and sources of parts not available at Allied. Since Allied sponsors this blog, they don't like people to mention the sources of parts they don't sell. That's why I sent you to my YouTube page.

dgrant
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Iron
Re: Enclosure
dgrant   10/11/2012 3:06:35 PM
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Aha! Sorry I didn't see the extended text beneath the youtube video.

armorris
User Rank
Platinum
Re: Enclosure
armorris   10/11/2012 3:48:55 PM
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The volume control has an auxiliary output for an optional audio switch to turn a subwoofer or audio system on and off with the incoming signal. If you are not going to use that, you can delete R2, R3, R8, D1 and D2. Add a wire in place of the diodes (between U4 pins 1 and 2).

armorris
User Rank
Platinum
Re: Enclosure
armorris   10/11/2012 4:34:22 PM
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Also, if you're not going to drive a low impedance load like headphones, you can delete transistors Q1 and Q2. I would leave R7 in place as the capacitors C1, C2, C3 and C4 could make U4 unstable.

armorris
User Rank
Platinum
Using a different remote control system
armorris   2/4/2014 7:36:41 AM
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A reader wanted to use a different remote control system with greater range for outdoor use. I redesigned the pot controller chip to accomodate two momentary inputs (UP and DN). I also rewrote the remote receiver code to produce two momentary outputs, originally to test the pot controller. My email address is in the article.  Please email me if you would like a copy of this code or preprogrammed chips.

armorris
User Rank
Platinum
A PCB is available
armorris   9/27/2014 12:23:10 PM
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One of my readers has designed a PCB (printed circuit board) for my gadget. He designed it to accomodate multiple configurations. That means what you do with the extra op-amp. For example, he uses it as a third channel for his high-end subwoofer. If you want a PCB, email me and I'll hook you up to him. I'm not making anything off of this project. I just want people to enjoy my gadget.

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