Dc Dc converter for 12V PWM
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@matej1006 do you mean you already have the meanwell? I would be very surprised if that gave noise issues.
Sorry I high jacked your thread a little as I may need drop down dc-dc soon and don't have the meanwell available.
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@DocTrucker no worry it's helpfull for too so welcome to use that thread.
Yes i already have not original Meanwell it's china version. So i hope that will be OK.
I was thinking that LM2596 are without noise. now i get it that is Meanwell with out noise so i will gave i tryMatej
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I order 4 wire PWM Noctua fan's and i read that i need to connect 12 v directly and just FAN1- to PWM PIN on Fan ?with help of zener diode. Just that i would like to control 3 fan's with same pwm output.
Here is photolink text
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https://duet3d.dozuki.com/Wiki/Connecting_and_configuring_fans#Section_Connecting_4_wire_fans
the zener diode is for the tacho signal.
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OK and it's this tacho signal good to have or not?
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@matej1006
depends on your usecase.if you can see or hear the fan moving then no.
if you want to check from far away then yes.
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than is probaly good to have yes
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@Veti sorry
I have one problem this 3 PWM noctua fan's will be mounted to water chller for colling water.
and is there possible to code that way that there is not connected to any heater.
there will be just one sensor with will be mounted on tank for measuring water temp.Do you have any idea how to write that with new RRF3 code?
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@matej1006 said in Dc Dc converter for 12V PWM:
Do you have any idea how to write that with new RRF3 code?
you define a new tool.
that tool is assigned a heater with the thermistor that you want to monitor
the fan is configured to be thermistatically controlled based on that heater.you can configure that in the configurator
https://configtool.reprapfirmware.org/Heaters
add nozzle, add fan, add tool -
@DocTrucker said in Dc Dc converter for 12V PWM:
If cheap systems are available which don't suffer the noise issue then it's not an issue
(Hope this doesn't come across as mansplaining:)
All switching regulators will have more noise than a linear regulator, thats just the price we pay to increase the efficiency. Weather or not its a problem, depends on so many factors, but in this case it was for regulatory approval not stability, so if you're not selling it and it works, you're probably okay*
*) that being said if you make stuff that radiates so much noise your neighbors tv is affected it may turn into not being okay:P
The Meanwell, clone or no clone with the metal enclosure will radiate less noise, but any ripple on the output will still be greater than that of a linear regulator. Most tiny modules use the boxed square-ish flat inductors that are shielded which is the same sort of thing in use on today Duets boards as well. Ref picture below, the alternative is the ones where you see the coiled wire basically.
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@DocTrucker said in Dc Dc converter for 12V PWM:
With complaints about PT100 sensors suffering noise problems I try to adopt low noise solutions.
Newer PT100 daughter boards have additional capacitors, which in my tests were very effective at eliminating noise issues. It's possible to retrofit the capacitors to older daughter boards.