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### Topic: replace digital potentiometer in 9v - 12v circuits (Read 5364 times)previous topic - next topic

#### Othersounds

##### Sep 01, 2011, 12:00 pmLast Edit: Sep 01, 2011, 01:26 pm by Othersounds Reason: 1
Hi,
I want to control variable resistances (2-10-50-100K, 1MOhm) in circuits via my computer (replace a pot by a software control).
I have read about digital potentiometers but in my case I have circuits powered at 9v and 12v (and with double power 9v/-9v/0v …) …
There used to be digital potentiometers up to 15v in DIP (Dual Inline Package), but they seem discontinued…
I suppose there is a case-by-case solution without using digital pots: I have 2 chaos generators circuits (see attached images) where i need computer control over the potentiometers.
The one called chua is more simple, there is only one variable resistance to control (1.5 or 2k):

The one called Jerkster is more complex with several variable resistances (R14,R21,R24,R2,R22):

Any solutions for these examples? Any digital pot in DIP package with up to 12v operation available? Any examples with schematics are very welcome!
Thanks,
Felix

Felix Luque Sanchez
http://www.othersounds.net

#### Edsoncan

#1
##### Sep 01, 2011, 01:16 pm
You can use CMOS switches and fixed resistance, is not very accurate but it is simpler and more flexible

#### Othersounds

#2
##### Sep 01, 2011, 03:27 pm
Hello Edsoncan,
There seems to be a lot of types, could you please explain me more in detail witch kind of CMOS switches should I use and point me to some specific models?
And how should I connect it to my 0-5v Arduino to control the CMOS switches as a variable resistance?
A schematic will be of great help, if someone can make it …
Thanks
F
Felix Luque Sanchez
http://www.othersounds.net

#3

#### Grumpy_Mike

#4
##### Sep 01, 2011, 08:56 pm
@Edsoncan - if he connects that to a 12 volt circuit he will blow up his arduino. That is only good for 5V circuits.

#### Othersounds

#5
##### Sep 02, 2011, 10:57 amLast Edit: Sep 02, 2011, 03:20 pm by Othersounds Reason: 1
Edsocan, thanks for the schematics!
Mike, thanks  for pointing that detail ;-)

I'm new to Multiplexers/Switches, and i don't get exactly how they work in this configuration... But are we using it as a voltage controlled resistance?
If it's the case, to work with the arduino and a make a 12v control signal, could we  use for example something like an uln2003 to feed the max4051 I/O pin?

arduino pwm output 5v--- uln2003 12v--- Max4051 I/O pin 3?

Thanks
F
Felix Luque Sanchez
http://www.othersounds.net

#### Grumpy_Mike

#6
##### Sep 02, 2011, 04:26 pm
Just a crude switching in of resistors will only work if you are after a potential divider which in the case of some of your pots you are not.
Most digital pots are 5V
http://en.wikipedia.org/wiki/Digital_potentiometer
but this is the only one I know that will work up to +/- 16V

#### Othersounds

#7
##### Sep 02, 2011, 07:03 pm
Hi Mike,
Yes, In fact i was thinking of using this one:
with the arduino library:
http://www.arduino.cc/en/Tutorial/SPIDigitalPot

It will be an expensive solution ... but should work ...
F
Felix Luque Sanchez
http://www.othersounds.net

#### Grumpy_Mike

#8
##### Sep 02, 2011, 09:59 pm
Yes that looks fine to me.

#### Neizr

#9
##### Apr 04, 2015, 02:18 am
Hi,

I have a simple question : do the AD5290 works fine with 9v power ?

Many thanks,

Neizr

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