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Topic: MSGEQ7 and noise on audio jack (Read 2396 times) previous topic - next topic

sekino

No the capacitors used for the audio path should not be ceramic.
I was thinking opposite from what you wrote... my bad... so I used the right ones...

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Yes, some degree of noise is normal. You can minimise it by using proper components and proper layout and supply decoupling. Still not see your schematic or a picture of how you constructed it.

Scheme updated here https://forum.arduino.cc/index.php?topic=636092.msg4607049#msg4607049
Soldered exactly like here https://youtu.be/3aPEeiJjQXs

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Up to you, do you want to minimise the noise or not? Your choice.
Sure, I will add that, no problem, just was curious if this will help...

Grumpy_Mike

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Soldered exactly like here https://youtu.be/3aPEeiJjQXs
What a dogs breakfast that is. I would be ashamed to present that as a video. It is an appalling technique. First off you only put the chip into a socket once the socket is soldered onto the board. Then he is using the wrong sort of capacitors for decoupling. The capacitors across power and ground have to be ceramic otherwise they are not much use.
The power supply is totally inadequate for driving that many LEDs and the wire routing is bad. There is no large capacitor across the LED strip and that PCB is not designed for good isolation.
The whole thing is just left in separate bits and soldering to a pin while it is plugged into an Arduino header pin is bound to cause heat damage.

Sadly yet another example of someone posting something on the internet who doesn't know what he is doing.

Yes it is two chips but these are only second order filters so it is not very good at separating the spectrum into 14 channels. There is too much overlap.

It is not your fault but people like him make me very angry.

sekino

Except all the faults he made (I didn't soldered chip inside socket, I put them inside before connecting power).
What could be source of noise in that project? He doesn't have any noise in the video :(
Change to ceramic capacitors? which ones? 100nF or 10nF ?

Grumpy_Mike

All the 100nF should be ceramic.

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