5x DRV8825 (Vref = 1V) to NEMA 17 on Geeetech GT2560 v3.0 Marlin board with Meanwell 24V 15A DC power supply (leftover parts from Geeetech A10 3D printer - am in Ozzieland down under).
(MPCNC part 4 | coeleveld.com)
Symptoms:
M17 to energise steppers [OK]
Faint same frequency hi-pitch sound [OK]
M18 to unpower steppers [OK]
Run crown test pattern [OK]
M17 to energise steppers [OK]
Faint rising frequency hi-pitch sound that cuts out and repeats indefinitely [not OK]
Probably time to swap PSU, stepsticks and/or logic board. Just wondering if anyone has come across similar symptoms perhaps.
Here is a sound file attached:
https://coeleveld.com/sound.wav
https://coeleveld.com/sound.mp3