Hey there, when I set "pinMode(11, OUTPUT);" on my original Arduino Uno and put there a tiny loudspeaker (8 Ohm) on it. There I get no glitches in Audio when its connected over USB. When I connect my Nano (CH340G) there are a lot of glitches in the signal even when I move my mouse. I assume that t…

It is hard to tell without knowing what your nano is actually doing. Mouse movement should not effect anything unless your sound signal is coming from the computer. However, you should never connect an 8R speaker direct to an Arduino. While the inductive reactance will keep the current down when pl…

Thanks for that advice I have done over new Year a new build. There I have combined 3 pwm pins together with 150 Ohms each connected to the Loudspeaker and to GND. I want to mix the signals so that i get an max. output voltage from 0-1V. Replacing the speaker with an high enough resistance as a vol…

First off, you description of " combined 3 pwm pins together with 150 Ohms each connected to the Loudspeaker and to GND." I find difficult in knowing exactly what you did. Can you please supply a schematic. Basically connecting outputs together is a big no no. Also you NEED a capacitor in series wi…

Capacitor is the wrong way round. You are best using a summing amplifier to mix signals.

Didn't know how to turn things in fritzing was one of my first sketches :confused: I will do a long term test, maybe this config works for me (with cap right round), why use an IC when you can keep it simple :grinning:. Will use an oscilloscope to track down problems if it doesn't go over the pin'…

will do a long term test, maybe this config works for me No it is useless doing a test in only one unit. How will you measure damage? The still working is insufficient. I used to do reliability testing for a major consumer electronics company so I know these things are not that simple. The first…

If I replace the speaker in the final product by a line out (0-1V spec) there couldn't be a mechanical part that swings forth and backwards to produce such spikes you mentioned. The Pullup resistors of 328p are around 20-50k so even 20k with 150 and 8 ohm from speaker in row tell me that even when i…

When looking at the sheet the digital pins have a max. output current of 40mAh. This should be fine also, but will do my math and measurements to be safe :slight_smile:

(Nano) Sound glitches on digital pin when powered over USB

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Grumpy_Mike January 3, 2021, 3:16pm 10

It’s not the voltage it is the current you are driving into an output from another output. Pull up resistors are irrelevant as they only concern inputs.

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(Nano) Sound glitches on digital pin when powered over USB

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