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Old 06-13-2013, 03:43 AM
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Everything looks like it checks out. But it turns out the BC549C can't power up multiple fans so the 2N3904 that is on that schematic Chris shared earlier. There's a thread on ukreefs about it but not sure if I can link it here...
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Old 06-13-2013, 03:46 AM
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Quote:
Originally Posted by daplatapus View Post
Everything looks like it checks out. But it turns out the BC549C can't power up multiple fans so the 2N3904 that is on that schematic Chris shared earlier. There's a thread on ukreefs about it but not sure if I can link it here...
Can you repost the schematic and the link to that thread so I can take a look?
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Old 06-13-2013, 04:06 AM
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Sure
Schematic:



Link: You may have to go back 2 pages I think to where the guy brings up his problem and works through it.

http://ukreefs.com/index.php?topic=605.135


Thanks Chris for the help! Even though I kept you up 'till all hours of the morning on the east coast
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Old 06-13-2013, 01:46 PM
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Hmmm, looking like I have a wee bit of bleed voltage on my OCW string. On one heatsink, one of the OCW all 3 LED's are faintly lit and on the next in the series 2/3 LED's are lit.



Wheeeee, isn't DIY fun!
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Old 06-17-2013, 12:14 PM
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Due to work and a project my wife asked me to do I've not been able to do anything on this project. I've ordered different transistors for the fan circuit and it's on it's way from China...

Pinhead: I tried returning your PM but your box is full.
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Old 07-07-2013, 08:27 PM
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Well, got all my proper parts from China for the Fan pwm control to build it exactly as per drawing above, and the PWM speed control still doesn't work... argh.
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Old 03-09-2015, 07:53 PM
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Gonna resurrect this. It's going to be the only thing holding me back from my tank upgrade soon. I built another circuit board to exactly match the one in post #214 last night. Plugged 'er all in this morning with one heatsink and it's doing to the same thing. Heatsink temp is at 38.6C and the fan hasn't ramped up. It's still running at the same speed it had started at. Maybe something in the sketch...
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