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2nd December 2010, 02:24 AM
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#1 |
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diyAudio Member
Join Date: Mar 2010
Location: Santiago, RS/ Brasil
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2 Speed Fan Controller
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!  Is alex mm around?Cheers, Max.
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We should not dwell on what we do not have, but, instead, be grateful for what we do have! 
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2nd December 2010, 10:29 AM
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#2 |
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diyAudio Member
Join Date: Jul 2004
Location: Scottish Borders
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Hi,
a suggestion for a little improvement. Can you insert a timer to allow the opamp to kick start the fan motor with full voltage? When the timer expires, the NTC determines whether slow speed or full speed is required.
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regards Andrew T. |
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4th December 2010, 02:23 PM
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#4 |
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diyAudio Member
Join Date: Mar 2010
Location: Santiago, RS/ Brasil
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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.
__________________
We should not dwell on what we do not have, but, instead, be grateful for what we do have!
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13th December 2010, 10:56 PM
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#9 |
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diyAudio Member
Join Date: Mar 2010
Location: Santiago, RS/ Brasil
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Here (Post your Solid State pics here.) you can see some pics of the amp where this fan controller has been inserted in.
Regards, Max.
__________________
We should not dwell on what we do not have, but, instead, be grateful for what we do have!
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14th December 2010, 12:02 AM
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#10 |
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diyAudio Member
Join Date: Apr 2008
Location: Carlisle, England
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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.
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http://www.murtonpikesystems.co.uk PCBCAD40 pcb design software. |
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