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TOPIC: Eliminating noise

Eliminating noise 1 year 11 months ago #1127

  • Ray
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First we got the charge pump IC. I read the datasheet. I will use 3AAAs batteries to produce -4.5V and feed that where the Vout pin is. We will see then what's going with the noise. Does that sound good to you? Do you see any problems that could arise with this method?
So your plan is not to use the charge pump (TC1044) and just create a -4.5V with external batteries to feed the board? Seems like a good idea, I would be tempted to use a battery-only power supply, creating +4.5 and -4.5V with batteries and not depending on the Arduino DUE power supply. I am pretty sure that the DUEs +5V switch-mode-power-supply could add noise to the system.

Good work!
Last Edit: 1 year 11 months ago by Ray.
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Eliminating noise 1 year 11 months ago #1134

  • BowDown
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I did it yet the noise still exists. Next i will start decoupling.
One more question, is the LED PWM?

Also i noticed a new error (WITH the TC1044) . When uploading effects like reverb, delay etc. The MIX SWITCH is UP. But i can still hear the noise from the strings (especially the 3 lowest strings) from my amp, even though it should not be heard, before the delay effects kicks in and they should be heard. So in other worksm i hear them two times, when i play them and when the delay effect kicks in. I dont remember if i had this one in the apst. Anybody else experience this?
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Eliminating noise 1 year 11 months ago #1135

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One more question, is the LED PWM?
Yes the led is on pin 3 which is a digital pin output, you can drive it doing: analogWrite(pin, value)

Also i noticed a new error (WITH the TC1044) . When uploading effects like reverb, delay etc. The MIX SWITCH is UP. But i can still hear the noise from the strings (especially the 3 lowest strings) from my amp, even though it should not be heard, before the delay effects kicks in and they should be heard. So in other worksm i hear them two times, when i play them and when the delay effect kicks in. I dont remember if i had this one in the apst. Anybody else experience this?
I think I am not completely understanding your question here... the mix switch function is to mix the original guitar signal with the affected one (sometimes is referred as mixing the "dry" and the "wet" signal). Some effects like echo or delay need the mix to be on, so you can hear the original guitar and then the repetition (or repetitions).

I dont get what is the problem with the TC1044..
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Eliminating noise 1 year 11 months ago #1144

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Hi emanueleloi, the first thing I will check is the power supply, have a look at this:
https://www.electrosmash.com/forum/hardware-pedalshield/26-powering-arduino-due
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