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Old 4th August 2006, 08:38 AM   #1
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Default encoder volume control

hi guys!
has someone a schematic of a volume control using a rotary encoder and a digital potentiometer?(if possible without microcontroller aid...)
thanx!
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Old 4th August 2006, 09:18 AM   #2
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i found this one...

http://www.edn.com/contents/images/278837f1.pdf

any other experience?
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Old 5th August 2006, 12:03 AM   #3
nonoise is offline nonoise  South Africa
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Hi,
Have a look at Maxim's MAX5440
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Old 6th August 2006, 10:04 PM   #4
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yes, already seen, but it has just 32 positions...i'd like to have at least 128...it will be great to have the same ic but with more positions...
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Old 7th August 2006, 06:32 AM   #5
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Rather than the quad decoder, I'd use a micro controller to read the rotary encoder and drive a digital audio pot such as the PGA2311 or PGA2310.
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Old 7th August 2006, 08:14 AM   #6
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yes, I know that using a micro everithing will be possible and easier, but i've passed long time without programming a PIC so...i don't remember practically anything!!
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Old 7th August 2006, 10:21 AM   #7
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hmm...i've seen the pga2311 characteristics...sounds pretty good...bikedude, maybe can you post schematic and pic program?? (or ANYONE ELSE WHO USE IT!!!)
do you also use an lcd to display the attenuation?
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Old 7th August 2006, 10:59 AM   #8
awpagan is offline awpagan  Australia
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raikkonen
good idea for keeping digital noise out of a preamp.
have thought about controlling a pga* without a clock or pic.
havn't found a way yet, but there are a lot of smarter people on here than me.

also why the pga2311?, the pga2310 has +/-15v analogue, better headroom.

allan
ps the other pga.
Digitally controlled preamp/headphone amp
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Old 7th August 2006, 12:13 PM   #9
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pga2311 simply because has better THD and i don't need so much headroom...5v is enough...probably i must shift on a microcontrolled system...
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Old 7th August 2006, 01:53 PM   #10
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Hi,

What I know of a simple to use quadrature decoder is the HCTL2000. It decodes directly a 2 phase quadrature pulse encoder and outputs a 8 bit digital word.

If you hook up this to a relay ladder attenuator Ö.. you can do without a micro controller.

Cheers
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