Identifying PWM Fans

[WmTasker]

Glad it's working for you. How do you like the MarkersLED heatsink? What are you using to control the LEDs?

 

[letoan]

Glad it's working for you. How do you like the MarkersLED heatsink? What are you using to control the LEDs?

MakersLED heatsink is nice in options imo, you can mount fans and other stuffs with out tinkers like heatsinkusa t-slots. The aluminium they use on MakersLED's heatsink seem pretty cheap when comparing it to heatsinkusa. The best thing I like about MakersLED heatsink is you can seal off the LEDs moisture with the included acrylic sheet. Overall I was pretty satisfied with MakersLED, the only I could with for more is more lanes for the LEDs (only 5 lanes with MakersLED).

 

[zachts]

If your having heating issues with transistors used on the fans, mount the transistor to your heatsink, that will solve the issue. I used bd138 if memory servs corectly on the controlls for mine (normal 3 wire fans) and it did need a small heatsink to stay cool running about 600mA to the fans, I don't think they would have burned up as I ran them for 8 hours with no heatsink for a test and they didn't shut down but got hot enough I was worried they could start a fire mounted into a canopy so I heatsinked them and they stay cool now.

I needed to add a capacitor to stop the anoying buz they were making but otherwise used the first diagram posted earlier on, with a diode, and the resistor for the base leg. cranking up the arduino to 25khz works too........

 

[letoan]

If your having heating issues with transistors used on the fans, mount the transistor to your heatsink, that will solve the issue. I used bd138 if memory servs corectly on the controlls for mine (normal 3 wire fans) and it did need a small heatsink to stay cool running about 600mA to the fans, I don't think they would have burned up as I ran them for 8 hours with no heatsink for a test and they didn't shut down but got hot enough I was worried they could start a fire mounted into a canopy so I heatsinked them and they stay cool now.

I needed to add a capacitor to stop the anoying buz they were making but otherwise used the first diagram posted earlier on, with a diode, and the resistor for the base leg. cranking up the arduino to 25khz works too........

The bc549 was pretty hot, I swapped it out for the tip120 today, only a little warm now.

 

[letoan]

What are you using to control the LEDs?

I'm planning to use arduino to control them.