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Old 14th September 2011, 12:43 AM   #1
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Default SIMPLE remote volume control with alps motorized pot

I want to build a remote-controlled volume control into my tube amp, using a motorized pot. The Alps pot is +3v for up, -3v for down... I want to build my own IR remote and my own receiver that will operate the rotary switch.

RF is really out of the question, as the tube amp is aluminum and steel and is so shielded i'm unlikely to get a signal through. The project box I found for the remote control is also aluminum.

Does anyone sell a super-simple kit that will do this? I don't want it to work with an existing remote, I want to build it myself, and the simpler the circuit the better.

Thanks!

Charles.
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Old 14th September 2011, 12:46 AM   #2
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Sounds like Dantimax might have something close to what you're looking for:

Dantimax (elektronik) - Kits
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Old 14th September 2011, 03:48 AM   #3
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Ive been thinking of something like this myself:

ALPS Pot 4 Ways Input Motorized Remote Control Selector | eBay
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Old 14th September 2011, 03:58 AM   #4
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I picked up a passive preamp from Veteran that uses an Alps remote control pot and I am very happy with it. You can find the thread in the Analog Line Level section. Perhaps you can find a way to work with his setup without the preamp section. Well made with gold plated through holes.
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Old 14th September 2011, 04:12 AM   #5
Pano is offline Pano  United States
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Mackin the box. I have the very kit you on Ebay you linked to. Have had it for years. It works well and is easy to use. Mine has a 100K pot, don't know if anything else is available.

There is some crosstalk, tho. Mostly on the relay board, but also in the volume section. I did everything I could think of to kill it, with no luck. Could never get it better than about 60dB. Just a word of warning of that's something that would bother you.
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Old 14th September 2011, 02:18 PM   #6
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It doesn't look like the daintamix kit actually comes with a remote control though.... I don't care about the mute or the power relay, I probably won't use those, but the crosstalk is an issue for me...

The 4-channel kit on eBay is just too much. I don't need all that, and I don't have the space for it. I shouldn't need a huge control board to give a pot +/-3v.

Any other ideas?

Charles.
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Old 14th September 2011, 08:53 PM   #7
RevMen is offline RevMen  United States
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What about something like this?

Velleman Inc.

You can control it with pretty much any IR remote, and it has 2 output channels. You'd have to build some simple logic to translate that into +3 or -3 at the pot input.
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Old 15th September 2011, 03:42 AM   #8
rfj5106 is offline rfj5106  United States
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Default Ebay special

You can find remote volume controls on ebay on the link below. Simple to build-just add a transformer and put in a box. I have been using one as a remote volume control for Daniel I tube preamp (love that phono section). It is extremely quiet and I can not tell its there when listening to vinyl records.

PGA2311 Volume Remote Control LCD Pre-Amplifier Kit DIY | eBay
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Old 15th September 2011, 04:41 AM   #9
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If your at all savy with any dialect of C programming, why not proto it with an arduino and burn the final project to a simple Atmega328 chip? Obviously you'd need a few logic steps in there for +3 and -3, but you could easily build your own IR receiver and have all the functions you want, how you want to control your pots. You'd even have pins left over for an LCD/VFD.
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Old 15th September 2011, 05:03 AM   #10
tomchr is offline tomchr  United States
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I implemented remote control on my preamp. I was originally planning to mill my own remote control out of a billet of aluminum and use a home-made circuit, but then I came across the Apple Remote. It transmits in NEC IR format using a 38 kHz carrier. These buggers handle the demodulation and give you TTL pulses out. I then use those pulses to trigger an interrupt on an Atmel AVR micro controller that handles the decoding (and controls display and a PGA2320 volume control chip).

The new aluminum version of the Apple Remote is real sleek and only $20... You can't build your own for that never mind come anywhere close to their industrial design.

Another option is to use Philips RC-5. There's plenty of code examples (including an Atmel app note) out there for that. Note, however, that RC-5 uses a 36 kHz carrier so you'll need the RPM7136 receiver.

The PGA2320 is rather noisy -- about 10 dB above the noise floor of a low-noise op-amp (such as LME49710). The PGA2311 should be better...

~Tom
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