Author Topic: Making a sound mixer  (Read 17142 times)

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Offline Sorunome

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Re: Making a sound mixer
« Reply #30 on: August 05, 2015, 09:12:16 am »
So I just ordered some digital potentiometers for some dark magic

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Offline Keoni29

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Re: Making a sound mixer
« Reply #31 on: August 10, 2015, 07:28:53 am »
Make sure that they can deal with the +12 -12v supply before you hook them up.
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Offline Geekboy1011

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Re: Making a sound mixer
« Reply #32 on: August 10, 2015, 07:57:34 am »
That sounds fun :3 I need to build an amp board for my pc at somepoint. But I will probably use digital pots and make it a USB HID controllable device ;) So I do not have to fiddle with manual pots :D

Offline Sorunome

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Re: Making a sound mixer
« Reply #33 on: August 10, 2015, 04:11:27 pm »
Make sure that they can deal with the +12 -12v supply before you hook them up.
Couldn't I power them only between the 0 and +12V or something?
That sounds fun :3 I need to build an amp board for my pc at somepoint. But I will probably use digital pots and make it a USB HID controllable device ;) So I do not have to fiddle with manual pots :D
Yeah the main reason why i got digital pots is that my manual ones are so shitty that the resistance randomly increases by more than double from time to time x.x

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Offline Keoni29

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Re: Making a sound mixer
« Reply #34 on: August 13, 2015, 06:12:04 am »
You can clean potentiometers by spraying some wd40 in the little hole at the top.
You need digital potentiometers with a dual power supply because the signal voltage may drop below 0V.  The potentiometer will cut off the signal and might even get damaged. You could use +6 and -6v supply across the device. It's effectively 12v but the center is shifted. For this you need additional regulators. You could also make the entire system run from a single supply, but it requires some trickery.
« Last Edit: August 13, 2015, 06:15:15 am by Keoni29 »
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Offline Sorunome

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Re: Making a sound mixer
« Reply #35 on: August 13, 2015, 06:14:38 am »
You can clean potentiometers by spraying some wd40 in the little hole at the top.
You need digital potentiometers with a dual power supply because the input voltage may drop below 0V. You could also use +6 and -6. For this you need additional regulators. You could also make the entire system run from a single supply, but it requires some trickery.
The issue is something mechanical, that the little metal nob thingy is detaching from the resistor part thingy, i blame china quality :P

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Offline Keoni29

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Re: Making a sound mixer
« Reply #36 on: August 13, 2015, 06:16:19 am »
Hmm I have tons of china quality pots and they seem to hold up fine (after cleaning)
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Offline Sorunome

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Re: Making a sound mixer
« Reply #37 on: September 09, 2015, 06:10:11 pm »
Ok, I got some trouble now, my Digital Potentiometers arrived and i set them to the exact same resistance value as the master channel of my sound mixer, i measured the resistance to make absolutely sure it matches the one of the analog resistor. And when using the digital one there is no sound coming out at all! D:
the digital pots are MCP42010

The power supply of the controlling unit (arduino + digital potentiometers) and the sound mixer (OP-Amps) is a different one.

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