I have seen that when there are signal integrity issues between the Teensy 4.1 and the audio adapter. It seems like even a momentary issue with MCLK can put it in a state giving that screeching noise that won't clear...
The Ethernet DP83825I transceiver chip can draw quite a bit of power when active - up to 41mA per the spec sheet.
With a decent heatsink and a little air, you might see 8-10C drop.
Besides what has already been...
I am unclear as to which touch controller you have. If you are using an ILI9341 with the XPT2046 touch controller like you linked to on the PJRC website, here is a simple program that should work on the LC. You will...
It looks like you may have pin #6 tied to RESET on the display? If so, unless you are modifying the program to drive that pin high, the reset pin will be floating which could give intermittent operation. You can just...
That pin drives a transistor that controls the LED backlight power. Active H to turn backlight on. Can tie to 3.3V or use pull-up to always have on or can use logic control.
I agree that 100MHz, 2-channel will handle most everything you might want to do. 4-channel tends to be more useful when working with analog like if you want to see what the input, output and feedback pins on an Op Amp...
That nRF24L01+ adapter will work fine with a T4.1 and shouldn't cause any damage if connected properly. The nRF24L01+ operates at 3.3V logic but is 5V logic tolerant on its inputs.
The main value of the adapter is...
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