2 Speed Fan Controller

Status
Not open for further replies.
Jump to Latest
smartx21

smartx21

Member
Joined 2010
#1
For those who don't like large heatsinks, this fan controller is a good choice.
It is well explained here: Two Speed Temperature Fan PWM Controller - Electronic Circuit Schematics
I slightly changed the circuit to use dual sensors and dual fans, and to be fed from a 24VDC input.
I need support to draw a decent PCB layout!:crazy: Is alex mm around?
Cheers,
Max.
 

Attachments

  • DSC00292.JPG
    DSC00292.JPG
    112.4 KB · Views: 1,273
  • DSC00293.JPG
    DSC00293.JPG
    105.7 KB · Views: 1,188
  • DSC00294.JPG
    DSC00294.JPG
    81.2 KB · Views: 1,133
  • DSC00295.JPG
    DSC00295.JPG
    107.1 KB · Views: 1,088
  • FanControl-PCB.jpg
    FanControl-PCB.jpg
    40.9 KB · Views: 1,071
  • FanControlPCB-componentes.jpg
    FanControlPCB-componentes.jpg
    38.1 KB · Views: 593
  • 2speedthermofancontroller_1250021666.jpg
    2speedthermofancontroller_1250021666.jpg
    32.9 KB · Views: 879
#4
I've inserted a diode in series with opamp output, and then a capacitor from +12V.
It works fine, thanks. It is good to cleanup dirt!
I've also inserted two LEDs, between T3 and T4 collectors and +12V, in order to monitor controller's state. Yellow for mid speed, and red for full speed. So, during power-on, red LED is lit!
Thanks!
Regards,
Max.
 
#11
nigelwright7557 said:
I designed my own little SMPS with a pot to control the speed.
I used a PIC micro with a PID technique.
It required very few components.
Click to expand...

Class D, PIC... I see you are very skilled.
As you can see, counter-clockwise I only make use of quite simple stuff.
Due to knowledge limitations, of course. But there is way to learn. It would be nice to see your schematics and builds.
Regards,
Max.
 
#12
smartx21 said:
Class D, PIC... I see you are very skilled.
As you can see, counter-clockwise I only make use of quite simple stuff.
Due to knowledge limitations, of course. But there is way to learn. It would be nice to see your schematics and builds.
Regards,
Max.
Click to expand...

The schematics are very basic. Just a PIC driving a MOSFET with the output voltage potentially divided back into a PIC analogue port A2D converter.
The clever bit is the software in the PIC doing the SMPS.
I worked for a PIC consultancy for 13 years so know my way around the PICs.

If you can get away with a 555 timer then great.
 
#13
My brother, who is an EE in Texas, USA, has presented me with a PIC programmer and a thick book to read. I just neeeeed to start.
As a very good computer programmer in the past, maybe I can climb this mountain...
 
Last edited:
#14
smartx21 said:
My brother, who is an EE in Texas, USA, has presented me with a PIC programmer and a thick book to read. I just neeeeed to start.
As a very good computer programmer in the past, maybe I can climb this mountain...
Click to expand...

I was originally a Z80 assembly programmer.
I was a bit horrified at the PICs when I first started using them after the Z80. However the PICs are cheap and have loads of options for interfacing.

I have a wealth of old PIC projects to draw on if I need to. Its easier than starting from scratch.
 
#20
Hey Alex,

Thanks!!🙂

jotha said:
Hi alex mm in pcb of smartx21 is used 2 FAN, could be included in your drawing of pcb the second fan?😕


Jotha
Click to expand...

I am confused as well.
So will I need 2 boards for 2 fans ?
Or can I just parallel 2 fans and connect them together ?

I am thinking of using this controller for a 100W amp, in which both channels are mounted on a single heatsink.
 
Status
Not open for further replies.
Top Bottom