Digital volume control
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Does anybody knows how to work out a digital volume control (with +/- for
vol control instead of knob) as seen in todays digital AV equipment?
John Leung
vol control instead of knob) as seen in todays digital AV equipment?
John Leung
Comments
This normally is achieved (when not embedded) by digital resistors as from
Maxim/Dallas
DS1867: Dual Digital Potentiometer with EEPROM
http://pdfserv.maxim-ic.com/arpdf/DS1867.pdf
DS1868: Dual Digital Potentiometer Chip
http://pdfserv.maxim-ic.com/arpdf/DS1868.pdf
These chips can be operated using pushbuttons or of cource a mcrocontroller
such as stamp.
The resistor then replaces the normal volume control resistor.
Regards peter
Oorspronkelijk bericht
Van: John Leung [noparse]/noparse]mailto:[url=http://forums.parallaxinc.com/group/basicstamps/post?postID=x3x2gGBP83sb0A41sf5uZOqYEFwk96bUsscuyyJDt6bcaYkSbzR1XrmNim-8pFBxnRrp7GjXl9JCVMUXqA]jleung00@n...[/url
Verzonden: donderdag 18 oktober 2001 8:38
Aan: basicstamps@yahoogroups.com
Onderwerp: Re: [noparse][[/noparse]basicstamps] Digital volume control
Does anybody knows how to work out a digital volume control (with +/- for
vol control instead of knob) as seen in todays digital AV equipment?
John Leung
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yet).
IC's are available that take a serial data stream and do basically
everything a preamp would - volume, tone controls, balance, fade (if f&r),
sometimes input selection also.
I believe they can be expensive, but you can salvage them from car audio
equipment sometimes. (At least one) Alpine uses one that is programmed
using I2C.
Other way is voltage controlled amplifier - the way you produce the control
voltage is entirely up to you.
Another way I guess would be to use digital resistor ICs in a conventional
audio pre amp.
I'm sure there are other ways and others will comment.
Luke.
On Thu, 18 Oct 2001, John Leung wrote:
M> Does anybody knows how to work out a digital volume control (with +/- for
M> vol control instead of knob) as seen in todays digital AV equipment?
M>
M> John Leung
--
'80 (ex)KE38 '86 ST141 '84 AE86 '90 ST185
>
> Another way I guess would be to use digital resistor ICs in a conventional
> audio pre amp.
Could you say something more about this? I actually looked for a
digitally-controlled pot at one point and didn't really find anything.
Sean T. Lamont, CTO / Chief NetNerd, Abstract Software, Inc. (ServNet)
Seattle - Bellingham - Vancouver - Portland - Everett - Tacoma - Bremerton
email: lamont@a... WWW: http://www.serv.net
"...There's no moral, it's just a lot of stuff that happens". - H. Simpson
M> On Thu, 18 Oct 2001, Luke Szymanski wrote:
M>
M> >
M> > Another way I guess would be to use digital resistor ICs in a conventional
M> > audio pre amp.
M>
M> Could you say something more about this? I actually looked for a
M> digitally-controlled pot at one point and didn't really find anything.
Hi,
Peter posted the msg below. You need to serially shift in 17 bits for each
volume change. You could probably build a discrete IC circuit to do that
shifting, or just use a single microcontroller (I'm not exactly sure what
Peter meant by "can be operated using pushbuttons"; pushing a button 17
times is not exactly convenient for the finished product [noparse]:)[/noparse]).
I didnt know about these specific IC's, wonder how well they'll do in the
tone control circuits also [noparse]:)[/noparse] I will be trying them in the next few weeks
as they seem to be the easiest things to use in an existing amplifier.
Luke.
On Thu, 18 Oct 2001, peter verkaik wrote:
M> Hi John,
M>
M> This normally is achieved (when not embedded) by digital resistors as from
M> Maxim/Dallas
M> DS1867: Dual Digital Potentiometer with EEPROM
M> http://pdfserv.maxim-ic.com/arpdf/DS1867.pdf
M> DS1868: Dual Digital Potentiometer Chip
M> http://pdfserv.maxim-ic.com/arpdf/DS1868.pdf
M> These chips can be operated using pushbuttons or of cource a mcrocontroller
M> such as stamp.
M> The resistor then replaces the normal volume control resistor.
M>
--
'80 (ex)KE38 '86 ST141 '84 AE86 '90 ST185
What I meant with pushbuttons, is that there are digital resistors (from
Xicor I believe) that have
pulse up and pulse down inputs. Whenever a pulse is received on these input
pins the resistor
increments or decrements by 1 position. I didn't check the Maxim specs, just
passed
along the links.
Regards peter
Oorspronkelijk bericht
Van: Luke Szymanski [noparse]/noparse]mailto:[url=http://forums.parallaxinc.com/group/basicstamps/post?postID=XJbjuV8dRXogVKr8hyNgIuM2BwQxmBfTuMirMtjuBRhPOha_6wQPRm29Nt6gUxquJz_po2M34wJ2_bZs]lsz@c...[/url
Verzonden: vrijdag 19 oktober 2001 5:38
Aan: basicstamps@yahoogroups.com
Onderwerp: Re: [noparse][[/noparse]basicstamps] Digital volume control
On Thu, 18 Oct 2001, Sean T. Lamont .lost. wrote:
M> On Thu, 18 Oct 2001, Luke Szymanski wrote:
M>
M> >
M> > Another way I guess would be to use digital resistor ICs in a
conventional
M> > audio pre amp.
M>
M> Could you say something more about this? I actually looked for a
M> digitally-controlled pot at one point and didn't really find anything.
Hi,
Peter posted the msg below. You need to serially shift in 17 bits for each
volume change. You could probably build a discrete IC circuit to do that
shifting, or just use a single microcontroller (I'm not exactly sure what
Peter meant by "can be operated using pushbuttons"; pushing a button 17
times is not exactly convenient for the finished product [noparse]:)[/noparse]).
I didnt know about these specific IC's, wonder how well they'll do in the
tone control circuits also [noparse]:)[/noparse] I will be trying them in the next few weeks
as they seem to be the easiest things to use in an existing amplifier.
Luke.
On Thu, 18 Oct 2001, peter verkaik wrote:
M> Hi John,
M>
M> This normally is achieved (when not embedded) by digital resistors as
from
M> Maxim/Dallas
M> DS1867: Dual Digital Potentiometer with EEPROM
M> http://pdfserv.maxim-ic.com/arpdf/DS1867.pdf
M> DS1868: Dual Digital Potentiometer Chip
M> http://pdfserv.maxim-ic.com/arpdf/DS1868.pdf
M> These chips can be operated using pushbuttons or of cource a
mcrocontroller
M> such as stamp.
M> The resistor then replaces the normal volume control resistor.
M>
--
'80 (ex)KE38 '86 ST141 '84 AE86 '90 ST185
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I was right about Xicor. They have digital resistors with simple up/down
control.
See the folowing selection guide.
http://www.xicor.com/product_select_guide.php?table=xdcp
regards peter
Oorspronkelijk bericht
Van: Luke Szymanski [noparse]/noparse]mailto:[url=http://forums.parallaxinc.com/group/basicstamps/post?postID=JV5MqtT2WYrkR1loIhAZF4K4lRHjwkQqqbAceAlwK6fu3fC9eDg4Gq1eWlnaMbgtBUreXohQWAeIBMgchQ]lsz@c...[/url
Verzonden: vrijdag 19 oktober 2001 5:38
Aan: basicstamps@yahoogroups.com
Onderwerp: Re: [noparse][[/noparse]basicstamps] Digital volume control
On Thu, 18 Oct 2001, Sean T. Lamont .lost. wrote:
M> On Thu, 18 Oct 2001, Luke Szymanski wrote:
M>
M> >
M> > Another way I guess would be to use digital resistor ICs in a
conventional
M> > audio pre amp.
M>
M> Could you say something more about this? I actually looked for a
M> digitally-controlled pot at one point and didn't really find anything.
Hi,
Peter posted the msg below. You need to serially shift in 17 bits for each
volume change. You could probably build a discrete IC circuit to do that
shifting, or just use a single microcontroller (I'm not exactly sure what
Peter meant by "can be operated using pushbuttons"; pushing a button 17
times is not exactly convenient for the finished product [noparse]:)[/noparse]).
I didnt know about these specific IC's, wonder how well they'll do in the
tone control circuits also [noparse]:)[/noparse] I will be trying them in the next few weeks
as they seem to be the easiest things to use in an existing amplifier.
Luke.
On Thu, 18 Oct 2001, peter verkaik wrote:
M> Hi John,
M>
M> This normally is achieved (when not embedded) by digital resistors as
from
M> Maxim/Dallas
M> DS1867: Dual Digital Potentiometer with EEPROM
M> http://pdfserv.maxim-ic.com/arpdf/DS1867.pdf
M> DS1868: Dual Digital Potentiometer Chip
M> http://pdfserv.maxim-ic.com/arpdf/DS1868.pdf
M> These chips can be operated using pushbuttons or of cource a
mcrocontroller
M> such as stamp.
M> The resistor then replaces the normal volume control resistor.
M>
--
'80 (ex)KE38 '86 ST141 '84 AE86 '90 ST185
To UNSUBSCRIBE, just send mail to:
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Take a look at Jameco Electronics part # 173024. It is a digital volume
control chip with two channels and pushbutton control. I just completed
a project using one of these with some ISD chipcorders feeding to the
volume IC and then to a LM386 amplifier. The whole thing (volume,
start/stop, and sound selection) is controlled by a remote control using
the Rentron TWS/RWS 434 remote products. I liked the Princeton volume
control as it was easy to wire and works well. Let me know if you want
the pdf data sheet for the volume IC and I will e-mail it to you. Good
luck!
Tom
________________________________________________________________________
________________________________________________________________________
Message: 11
Date: Thu, 18 Oct 2001 15:38:14 +0800
From: "John Leung" <jleung00@n...>
Subject: Re: Digital volume control
Does anybody knows how to work out a digital volume control (with +/-
for
vol control instead of knob) as seen in todays digital AV equipment?
John Leung
> yet).
>
> Other way is voltage controlled amplifier - the way you produce the
control
> voltage is entirely up to you.
If you go with a voltage controlled amplifier, you could then set up a PWM
routine in the stamp and go through an RC filter to produce the variable
voltage. Going into the stamp would then be two pushbuttons for +/-. Sounds
like a neat application for a BS1 or one of the small PIC units.
Keep in mind that this is only my suggestion as I have not tried this
either, but logic dictates that this method (along with some other ones)
should work.
Cheers,
Gerry Shand
gshand@h...
With enough time, energy and/or money, anything is possible
jameco web page is there, I just cannot watch the details for the component
you have mentioned. But I will try again later. By the way, I also need to
know if that component is available in my country, otherwise, it takes a
long way for me to order it.
John Leung
Original Message
From: "TWELLE" <twelle@a...>
To: <basicstamps@yahoogroups.com>
Sent: Friday, October 19, 2001 7:33 PM
Subject: RE: [noparse][[/noparse]basicstamps] Digital volume control
>
> John,
> Take a look at Jameco Electronics part # 173024. It is a digital volume
> control chip with two channels and pushbutton control. I just completed
> a project using one of these with some ISD chipcorders feeding to the
> volume IC and then to a LM386 amplifier. The whole thing (volume,
> start/stop, and sound selection) is controlled by a remote control using
> the Rentron TWS/RWS 434 remote products. I liked the Princeton volume
> control as it was easy to wire and works well. Let me know if you want
> the pdf data sheet for the volume IC and I will e-mail it to you. Good
> luck!
> Tom
>
> ________________________________________________________________________
> ________________________________________________________________________
>
> Message: 11
> Date: Thu, 18 Oct 2001 15:38:14 +0800
> From: "John Leung" <jleung00@n...>
> Subject: Re: Digital volume control
>
> Does anybody knows how to work out a digital volume control (with +/-
> for
> vol control instead of knob) as seen in todays digital AV equipment?
>
> John Leung
>
>
>
>
>
>
> To UNSUBSCRIBE, just send mail to:
> basicstamps-unsubscribe@yahoogroups.com
> from the same email address that you subscribed. Text in the Subject and
Body of the message will be ignored.
>
>
> Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/
>
>