View Single Post
Old 07-22-20, 10:18 PM   #177
Supreme EcoRenovator
NiHaoMike's Avatar
Join Date: Oct 2008
Location: Austin, TX
Posts: 1,126
Thanks: 15
Thanked 247 Times in 233 Posts

Originally Posted by randen View Post
The small pump motor thats being powered by PWM supervised by a thermistor in the liquid cooled heat sink needs a different method. Lower temperatures cause a PWM signal that makes the little pump motor squeal in a high pitch.
Try increasing the PWM frequency to above 20kHz.
To my surprise, shortly after Naomi Wu gave me a bit of fame for making good use of solar power, Allie Moore got really jealous of her...
NiHaoMike is offline   Reply With Quote