encoder volume control

morpheus82 · 4th August 2006, 07:38 AM

hi guys!
has someone a schematic of a volume control using a rotary encoder and a digital potentiometer?(if possible without microcontroller aid...)
thanx!

morpheus82 · 4th August 2006, 08:18 AM

i found this one...

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

any other experience?

nonoise · 4th August 2006, 11:03 PM

Hi,
Have a look at Maxim's MAX5440

morpheus82 · 6th August 2006, 09:04 PM

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...

bikedude · 7th August 2006, 05:32 AM

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.

morpheus82 · 7th August 2006, 07:14 AM

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!!

morpheus82 · 7th August 2006, 09:21 AM

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?

awpagan · 7th August 2006, 09:59 AM

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

morpheus82 · 7th August 2006, 11:13 AM

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...

Pjotr · 7th August 2006, 12:53 PM

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 ….. you can do without a micro controller.

Cheers

4th August 2006, 07:38 AM	#1
morpheus82 diyAudio Member Join Date: Oct 2004	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!

7th August 2006, 09:59 AM	#8
awpagan diyAudio Member Join Date: Nov 2004 Location: sydney	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 __________________ Indecision makes the world gone round. Maybe

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4th August 2006, 08:18 AM	#2
morpheus82 diyAudio Member Join Date: Oct 2004	i found this one... http://www.edn.com/contents/images/278837f1.pdf any other experience?

4th August 2006, 11:03 PM	#3
nonoise diyAudio Member Join Date: Jun 2006	Hi, Have a look at Maxim's MAX5440

6th August 2006, 09:04 PM	#4
morpheus82 diyAudio Member Join Date: Oct 2004	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...

7th August 2006, 05:32 AM	#5
bikedude diyAudio Member Join Date: Nov 2004 Location: Seattle	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.

7th August 2006, 07:14 AM	#6
morpheus82 diyAudio Member Join Date: Oct 2004	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!!

7th August 2006, 09:21 AM	#7
morpheus82 diyAudio Member Join Date: Oct 2004	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?

7th August 2006, 11:13 AM	#9
morpheus82 diyAudio Member Join Date: Oct 2004	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...

7th August 2006, 12:53 PM	#10
Pjotr diyAudio Member Join Date: Nov 2002 Location: Netherlands	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 ….. you can do without a micro controller. Cheers

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