Replace analog pot with digital pot?
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I want to replace the analog potentiometer with a digital one for my xbox laptop.
The analog one has 6 pins so can i just desolder that and get a digital pot or do i need to make a little circuit?
Also analog pot is a B10K.
Thanks
The analog one has 6 pins so can i just desolder that and get a digital pot or do i need to make a little circuit?
Also analog pot is a B10K.
Thanks
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- Posts:381
- Joined:Thu Oct 18, 2007 7:15 am
Re: Replace analog pot with digital pot?
analog pot on what...the joysticks? I think the question is what the output is on the digital one you'd like to use. I don't know much about the way the circuit is laid out, but I'd venture to guess swapping it with a digital one or even a non-analog one would entail quite a bit of hardware and software tomfoolery.
Re: Replace analog pot with digital pot?
Is for speakers with amp could I wire it in to the audio cord and leave other one?
Re: Replace analog pot with digital pot?
Yes, though if you do decide to replace it you will need to make a little circuit, but I can help design that.
The circuit will contain
The circuit will contain
- Digital Potentiometer(s)
- One potentiometer per channel
- Jumpers
- input/output/supply
- buttons
- increase/decrease/reset/mute
- (timer)
- pulses so that you don't need to (click,click,click,click)
Re: Replace analog pot with digital pot?
Thanks Snow_Cat.
Here are some links to pictures of sound amp with pot removed. there are 8 pins because the back 2 pins are the power switch which I'm going to wire a push button to.
http://tomas02.yolasite.com/resources/I ... 73x279.JPG
http://tomas02.yolasite.com/resources/I ... 56x191.JPG
http://tomas02.yolasite.com/resources/I ... 56x191.JPG
Thanks for the help
Here are some links to pictures of sound amp with pot removed. there are 8 pins because the back 2 pins are the power switch which I'm going to wire a push button to.
http://tomas02.yolasite.com/resources/I ... 73x279.JPG
http://tomas02.yolasite.com/resources/I ... 56x191.JPG
http://tomas02.yolasite.com/resources/I ... 56x191.JPG
Thanks for the help
Re: Replace analog pot with digital pot?
Could you take some resistance measurements for me so that I can see the correct pot value.
I am expecting R1=R4, R2=R5, R3=R6=R1+R2=R4+R5, R7=closed/open.
Code: Select all
1──┤R1├──2──┤R2├──3
└──────┤R3├───────┘
4──┤R4├──5──┤R5├──6
└──────┤R6├───────┘
7──────┤R7├───────9
Re: Replace analog pot with digital pot?
will get that done when i find my multimeter in next day or so.
how far should i have knob turned when doing this? all the way? half way?
how far should i have knob turned when doing this? all the way? half way?
Re: Replace analog pot with digital pot?
If you turned it half-way (rotation wise) that would tell me if it is logarithmic or linear.
But it should not make that much of a difference functionally.
But it should not make that much of a difference functionally.
Re: Replace analog pot with digital pot?
Im really sorry its taken so long but have been busy but here are resistances
1──┤R1├──2──┤R2├──3
└──────┤R3├───────┘
4──┤R4├──5──┤R5├──6
└──────┤R6├───────┘
7──────┤R7├───────9
R1=3.92
R2=6.42
R3=9.82
R4=3.76
R5=5.73
R6=9.30
R7=0.00
These were all taken with meter set to 20k ohms
1──┤R1├──2──┤R2├──3
└──────┤R3├───────┘
4──┤R4├──5──┤R5├──6
└──────┤R6├───────┘
7──────┤R7├───────9
R1=3.92
R2=6.42
R3=9.82
R4=3.76
R5=5.73
R6=9.30
R7=0.00
These were all taken with meter set to 20k ohms
Re: Replace analog pot with digital pot?
If that is at about the halfway point mark then it is not quite log and not quite linear. I'll assume that is called 'audio' for the other options are apparently 'linear' and 'log'.
I'll assume that 7-9 is a normally closed switch.
(search results)
Oops.
Could you set the pot to "mute" and remeasure?
I'll assume that 7-9 is a normally closed switch.
(search results)
- Integrated Circuits (ICs), Data Acquisition - Digital Potentiometers
- digikey.com10K Audio
10K is the closest 'normal' size to what you measured, and other "Audio" pots include 20K and 45K.- maxim-ic.comMAX5456,MAX5457
$3.00 (CDN) and designed to use push buttons!
While 3-wire SPI can also be operated by pushbuttion (I've done it before) strictly speaking it would not be user friendly.
- maxim-ic.comMAX5456,MAX5457
- digikey.com10K Audio
Oops.
Could you set the pot to "mute" and remeasure?
Re: Replace analog pot with digital pot?
with pot turned all the way to left without doing click of switch so switch on but pot off (if that makes sense)
R1=0
R2=9.8
R3=0
R4=0
R5=9.3
R6=9.3
R7=0
R1=0
R2=9.8
R3=0
R4=0
R5=9.3
R6=9.3
R7=0
Re: Replace analog pot with digital pot?
I am going to assume that your measurement for R3 was some sort of error.
Also, the IC is 4x4mm with a pitch of 0.65mm.
docs.google.com2011.04.12.pdf contains
Also, the IC is 4x4mm with a pitch of 0.65mm.
docs.google.com2011.04.12.pdf contains
- Schematic
- Based on reference design.
- Component Layout
- Only top traces are needed, bottom is redundant to top and components.
- "A" shaped pinout is emulated for convenience.
- The all important MUTE button is seperated from the other three for convenience
- Note "■●●" is "123".
- Can be redesigned for different button placement or headers to buttons if requested.
- PCB front
- Both capacitors are 0.1µF
- Four push buttons are B3F-10XX style
- Switch is 'small' style
- LED and resistor remain to be calculated/determined.
- PCB back
- Contains redundant traces for convenience.
Re: Replace analog pot with digital pot?
Hi,
Thanks so much for that
just a question or two
What is the mode switch for?
how would the design change to have one header for all buttons?
Thanks in advance
Thanks so much for that
just a question or two
What is the mode switch for?
how would the design change to have one header for all buttons?
Thanks in advance
Re: Replace analog pot with digital pot?
The 'mode' switch toggles the use of the other two buttons so that you can adjust either the channel balance or the volume.
I could redesign using the MAX5456 that has seperate buttons for volume and balance if you want (but that will require more buttons).
docs.google.com2011.04.27.pdf desribes the button-on-a-header design.
I could redesign using the MAX5456 that has seperate buttons for volume and balance if you want (but that will require more buttons).
docs.google.com2011.04.27.pdf desribes the button-on-a-header design.
- Schematic using Max5457.
2P2T switch used to activate shutdown feature of pot. - Component placement
- top wiring/trace layer
- bottom wiring/trace layer (only one jumper)
- board-to-board wiring
left edge: buttons, mode indicator, and (on/off+shutdown) toggle switch
top right: MAX5457 and related components
bottom right: original pot. foot print
Re: Replace analog pot with digital pot?
Thank you so much for all the work youve put into this snowcat
do you know where i could get a pcb like this made in NZ
as i dont have the equipment available to make this.
Thanks
do you know where i could get a pcb like this made in NZ
as i dont have the equipment available to make this.
Thanks