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Custom Fan Controller Build - Working on 5" display (Warning: pic heavy) - Page 4

post #31 of 538
5/10/12 at 7:51am
Quote:
Originally Posted by radodrill View Post

That's what I built wink.gif it works well if you chance the timing capacitor from 0.1 uF to 100 pF

thanks for the tip. I grabbed an assortment of small caps to swap out in case my fans tick. I guess I will just start with 100pF and go from there smile.gif Maybe I will build that this weekend since the parts are just collecting dust.

Still, OP's idea is awesome, I might try that one of these days.
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post #32 of 538
5/13/12 at 4:32am
Thread Starter 
Quote:
Originally Posted by Erik in sac View Post

thanks for the tip. I grabbed an assortment of small caps to swap out in case my fans tick. I guess I will just start with 100pF and go from there smile.gif Maybe I will build that this weekend since the parts are just collecting dust.
Still, OP's idea is awesome, I might try that one of these days.

I had a quick look at the MIC502, I'm not sure it's recommendable to use 100pF, the recommendation in the datasheet is 0.1uF or 100nF giving a frequency of 30Hz. I'm not saying it will not function properly at 30KHz, I haven't tried it, just make sure to test the output with a scope under load to confirm it's still capable of good switching at that frequency.

There is also an application note for the MIC502 where they have a circuit similar in functionality to the one I'm using to generate a regulated linear voltage from the PWM output.

256

In my design I manually generate the PWM using the PIC microcontroller, not using MIC502 or similar. I've chosen 1KHz for my PWM as I change it into linear voltage for Fan speed control, so any noise issues are completely eliminated, and I use the same PWM frequency for RGB LED control.
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post #33 of 538
5/13/12 at 4:39am
as for pwm controllers, they can be made easily with 555 chip smile.gif
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post #34 of 538
5/13/12 at 4:41am
Wow this looks amazing. Too bad you won't be selling them. frown.gif
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post #35 of 538
5/13/12 at 5:02am
Looks amazing! Good idea +rep
Gonna watch this space over the next few days! thumb.gif
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post #36 of 538
5/13/12 at 9:57am
Thread Starter 
Quote:
Originally Posted by mr one View Post

as for pwm controllers, they can be made easily with 555 chip smile.gif

Agree, it's quite simple to generate PWM with just an NE555 timer, but I do see advantages in using purpose build circuits an they do offer more features.
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post #37 of 538
5/13/12 at 10:00am
Thread Starter 
Quote:
Originally Posted by Fuganater View Post

Wow this looks amazing. Too bad you won't be selling them. frown.gif

Quote:
Originally Posted by Matt-Matt View Post

Looks amazing! Good idea +rep
Gonna watch this space over the next few days! thumb.gif

Thanks, appreciate it.

I did get more components yesterday, I'll post a couple of progress pics soon.
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post #38 of 538
5/13/12 at 10:11am
Thread Starter 
A couple of progress pictures, I've got all the components soldered in now.

374

413

Still not ready to fire them up, I need to do a bit of checking first to make sure it doesn't go up in smoke, but getting very close. smile.gif
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post #39 of 538
5/13/12 at 10:41am
drool.gif
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post #40 of 538
5/13/12 at 10:41am
Quote:
Originally Posted by jvjessen View Post

A couple of progress pictures, I've got all the components soldered in now.
374
413
Still not ready to fire them up, I need to do a bit of checking first to make sure it doesn't go up in smoke, but getting very close. smile.gif
really great looking and really great job done smile.gif
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