Hello,
I created this 10V PWM circuit (from a 3.3V GPIO), using a LMC7101 op amp, and the PWM frequency is 350 Hz. The circuit is making a pretty loud audible noise, and I am wondering how I can attempt to troubleshoot it and make it quieter?
Circuit:
All components are 0603 components (except for the 33 ohm resistor is 1206).
I have a limitation where I cannot increase the frequency past 350 Hz, this is as fast as it can go, otherwise I would try increasing the frequency until the sound is gone.
I also am having difficulty telling exactly where the sound is coming from, but its definitely coming from one of these components on the schematic I shared.
Any help or advice is greatly appreciated, thanks!
I created this 10V PWM circuit (from a 3.3V GPIO), using a LMC7101 op amp, and the PWM frequency is 350 Hz. The circuit is making a pretty loud audible noise, and I am wondering how I can attempt to troubleshoot it and make it quieter?
Circuit:
All components are 0603 components (except for the 33 ohm resistor is 1206).
I have a limitation where I cannot increase the frequency past 350 Hz, this is as fast as it can go, otherwise I would try increasing the frequency until the sound is gone.
I also am having difficulty telling exactly where the sound is coming from, but its definitely coming from one of these components on the schematic I shared.
Any help or advice is greatly appreciated, thanks!