LED strip - squealing noise

[puntloos]

So some, but not all of my dimmable (dali) white spectrum (warm-cool) led strips make a very annoying squealing noise when they hit a certain level of dimming. 

I actually used a phone spectrum analyser app to record it, and then turn it off and on

 

top part is real frequency, you can see the marked peak, 3000-ish hz, probably not a coincidence that the dimmer is also using that frequency for PWM

bottom part is the 'history' and you can see when I turn the lights off the line disappears, turn it on, there it is. 

 

Anyone run into this before and how can I handle this?

 

[Dan F]

Is the noise coming from the tape or the drivers?  What tape, drivers and power supply are you using?

[puntloos]

@Dan F - pretty sure it's coming from the strip, not the driver (drivers are in another room)

 

Drivers: http://www.ltechonline.com/html/en/Dimmable-LED-Driver/DALI-Series/Constant-Voltage-DALI-Dimmable-Driver/LM-240-24-G2D2.html

Strip: https://www.darklightdesign.com/dld-lightflow-24v-10w-dim-to-warm-linear-led-tape/

 

 

[Dan F]

3 minutes ago, puntloos said:

@Dan F - pretty sure it's coming from the strip, not the driver (drivers are in another room)

 

Drivers: http://www.ltechonline.com/html/en/Dimmable-LED-Driver/DALI-Series/Constant-Voltage-DALI-Dimmable-Driver/LM-240-24-G2D2.html

Strip: https://www.darklightdesign.com/dld-lightflow-24v-10w-dim-to-warm-linear-led-tape/

 

We are also using tunable white tape and DALI tunable white drivers.  No noise whatsoever from ours, but we do have issues with consistent dimming https://forum.buildhub.org.uk/topic/33333-led-tape-varying-brightness-from-different-modules/. How is your dimming?

 

 

Dark Light Design are just up the road from us and supplied some of the profiles we used (we used someone else for design).  Have you spoken to them?