|System Name||Small ATX Desktop|
|Processor||Intel i5 8600K @ 4.6 GHz Core & 4.3 GHz Uncore @ 1.168V|
|Motherboard||Asrock Z370 Taichi|
|Cooling||Phanteks PH-TC14PE, MonoPlus, Fans: 2xThermalright TY143 / 2xCorsair SP-120L / 2xYate Loon D14BH-12|
|Memory||G-Skill TridentZ 2X8GB DDR4 3200 CL14 F4-3200C14D-16GTZ @ 3200 14-14-14-34 2T @ 1.35V|
|Video Card(s)||Zotac 1060 6GB Mini ZT-P10600A-10L with Arctic MonoPlus and Yate Loon D14BH-12 Fan|
|Storage||OS Samsung 970 Pro 512GB NVMe, Games Phison E12 NVMe 1TB, Data WD10EZEX HDD 1TB|
|Display(s)||2x Asus PB258Q 2560x1440 25" IPS|
|Case||Lian Li PC A05NB (Inverted Mobo)|
|Audio Device(s)||Audiotechnica ATH M50X, Antlion Mod Mic 4, SYBA SD-CM-UAUD, Acoustic Research 2Ch Speakers|
|Power Supply||Seasonic SS-660XP2 660 Watt Platinum|
|Mouse||Zowie EC2A Mouse, Razer Naga Chroma '14, Corsair MM600, Inateck 900x300 XL pad, Tiger Gaming Skates.|
|Keyboard||Filco Majestouch II Ninja TKL, Goldtouch GTC 0033 Ten Key, PS3 Controller|
|Software||Win7 Pro 64 (Installed on Coffee Lake using AsRock's handy PS/2 Simulator in Bios)|
I'm sorry, i'm not an expert, but if you still need it, you might want a bigger resistor at the output. This one will dissipate 1,44W at 12V output. I'd also think about a cap to flatten the voltage. Alternations in the voltage may couse the fan to stick to certain harmonic frequencies of the signal.Hello, its been great to know that this thread is living so long and still being commented and a great thread to know the PWM thing and electronic hack nicely. If anybody listen then help me to answer for the following. I drawn a similar circuit suggested by Lazzer408 on a online simulator and tried to run it, It was simulated nicely without any error. Can anybody suggest me any for mods, or can I go ahead to make on the board for real test?
View attachment 84940
First, many thanks for sharing. Sorry for necro, but I built this circuit and used a SUP50N03 (instead of the IRL530N) which can source hefty amps even at Vgs=2v and has low Rds(on): http://www.vishay.com/docs/66570/sup50n03.pdf ... it doesn't say it's a logic level mosfet, but specs show it should work just fine, unless I'm mistaken! Please correct me.I had to start a new thread because I couldn't update the old one.
Here's the improved mosfet version of the 4pin pwm to 3pin fan circuit. This is closer to Intel's spec which allows for up to 5.25v pull-up and 5ma on the pwm pin. This is 5.15v and 1.2ma. Any logic-level n-channel mosfet capable of a few amps will work fine.
Tested, working. Enjoy.
|Processor||AMD Ryzen 5 1600|
|Motherboard||Gigabyte - GA-AB350M-Gaming 3|
|Memory||Corsair - Vengeance LED DDR4-3000 16GB|
|Storage||Western Digital - Black PCIe 256GB SSD + 3x HDD|
|Display(s)||42" TV @1080p (main) + 32" TV (side)|
|Case||Cooler Master HAF X NV-942|
|Audio Device(s)||Line 6 KB37|
|Power Supply||Thermaltake Toughpower XT 775W|
|Mouse||Roccat Kova / Logitech G27 Steering Wheel|
|Keyboard||Roccat Ryos TKL Pro|
|Software||Windows 10 Pro x64 v1803|
Thanks for replying. I used a SUP50N03 which can source 5+ amps at 2.4v, and goes up to 50+ amps with higher Vgs (it's also a fast switching mosfet). I built the circuit in the 1st post to drive 6 powerful fans rated at 12v, 5.4w. At full speed these fans together draw about 2.5 amps.Hi there,
The clicking sound shouldn't be a problem. In fact, many cheap PWM controlled fans make it. It happens because of the steep signal edges. Better fans have some integrated ICs to power the motor more gently and reduce the sound level. Anyway if you check datasheets of same fans, one with PWM control and one without, the PWM fan should be rated as louder. (fe. BQ pure wings 2 are rated for 19.2dB and the PWM version for 20.2dB).
And if you're interested, high side switching + cap works well on arduino, so you can try it with your PC.