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Posts Tagged ‘Fan’

Fan controller project

Thursday, October 27th, 2016

Lucky Resistor has written up documentation on his fan controller project: The fan controller described on this project page, controls one or more PWM controlled 12V PC fans. It uses the input from two precise DHT22 based temperature sensors. The MCU is an Arduino Uno, which is powered using a...

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Posted in Arduino | No Comments »

App note: Reducing acoustic noise in PWM controlled fans

Saturday, September 8th, 2012

Microchip describes techniques to reduce acoustic noise in pulse width modulator controlled fans. One solution is to use an RC filter to decrease the slew-rate of the PWM pulses. Fan speed control extends fan service life and decreases airflow noise and average fan current. The most efficient way to implement...

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Posted in app notes | 1 Comment »

Recent Comments

  • Drone: So these go for around $330 USD and NO published calibration procedure online or otherwise? Given what's inside - I don't think I'll be considering...
  • Pekka Akselin: This is ridiculous!? :-) We are back at 256(!) byte EPROMs that needed multiple, a handful, of voltages to run! :-(
  • KH: Let's try a back-of-envelope calc balancing energies. From MCP1700 datasheet, there are graphs for a 200mA load step. Estimate the energy shortfall as 12uJ. Say...
  • Daniel: It's been a week and my comment is still awaiting moderation. Apparently the CIA doesn't want their involvement known?
  • KH: Agree, so okay, I guess he must have learned from somewhere. 100nF and 1000uF is so far apart, that was jarring; it's more magic incantation...