- Joined
- Oct 30, 2013
That will work too. I kept it all soic since this is a pretty common and very easy to solder package.
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Hi everyone
I've been looking through this thread for quite a while now and have been using the search function (apparently I suck at searching)
Can someone point me in the right direction please
I want to run 8 max fans off one channel and use the motherboards software to control the speed, do any of the schematics allow this,
if so, which one/s
Thanks
https://m.aliexpress.com/item/328341...wer-Socket-PCB
Should be able to get this shipped to you. Same deal as the one from amazon. One pwm socket controls all fans, power is provided though SATA.
void updateLCD() { // begin function for updating the lcd
unsigned char convertit; //
char buf[16]; // character buffer for the lcd
convertit = pwm_duty / 255 * 100; //
WordToStr(convertit, buf); // convert the duty cycle to string data and put it in buf
strcat(buf, "%"); // append "%" to the character buffer
Lcd_Out(2, 13, buf); // print out the data on line 2
//
}
Hi everyone,
I set up the circuit, the frequency was around 23kHz, but in a given duty cycle range the cooler produces a very annoying noise, I changed the frequency to more and less without very successful (in some cases it reduces a little but does not stop). I used a new pc processor cooler (3 wires), I know that on the pc it doesn't make that annoying noise, so is there anything I can do to improve it?
Thankful.
\Sorry for the audio not being good in the video.
- - - Auto-Merged Double Post - - -
Hi everyone,
I set up the circuit, the frequency was around 23kHz, but in a given duty cycle range the cooler produces a very annoying noise, I changed the frequency to more and less without very successful (in some cases it reduces a little but does not stop). I used a new pc processor cooler (3 wires), I know that on the pc it doesn't make that annoying noise, so is there anything I can do to improve it?
Thankful.
Sorry for the audio not being good in the video.
I've been meaning to post in this thread for a while now but haven't got round to it - I even had to reactivate my account because it's been four years since my last post (thanks mods!). I know it's a little late, but it's worth replying to sn4k3 above to reiterate that the original 555 circuit was superseded by the 0-100% controller, which I have been using for several years now and have employed to successfully test many high powered fans. Whils the 555 or 556 circuits are an easier option for the beginner, I'd strongly recommend building the 0-100% version.
I think it's worth keeping this thread "alive" because it's always nice to see where enthusiasts take these designs, and it's also interesting to keep up to date with PWM fans that are new to the market. Since this thread was started, there have been two notable fan releases: the 2150rpm model of the Gentle Typhoon (Nidec Servo D1225C12B6ZPA) which is a 4-wire PWM fan; and the Noctua NH-A12x25, a direct competitor to the Nidec, also a PWM fan. In time I'd like to do my own testing with these fans, especially to compare them to 120x38mm "server" fans. The Noctua especially is very expensive for a standard 120mm case or heatsink fan, and for me it's very cleverly marketed but woefully overpriced.
Anyway, onwards to some pictures. I recently came across three very powerful 92x38mm Delta fans, model PFR0912XHE, which I purchased for equivalent to a little over $3 each (yes, you read that correctly). These are 11,000rpm fans which draw a little under 4A at full speed, though 4.5A is printed on the label. Unlike most of the Deltas I have, the frame and impeller are both made from fibre-reinforced plastic, which is what San Aces tend to be made from.
With the 0-100% controller the behaviour is very interesting, but as you'd expect the control is pleasing because of its accuracy. The PWM signal is not inverted and at low RPM the fan is inaudible.
I also got a 140x50mm San Ace which is a beast. It's only 1.8A but because of its size has the capacity to move 220cfm at 3,000rpm. Some pics for now and I'm planning to make some videos in the near future.