Designing a PWM to Analog mini board for fans
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In my case, I as of now attempted a "manual recurrence clear" from 10Hz to a few KHz, and there was not a great one. Moreover, the development board (Duex5) includes a fixed PWM recurrence of 500Hz, so I got to bargain with that. I'm building the model right presently, and I'm as of now mindful of the control scattering. But I'm beneath 100mA, and within the more awful case (approximately 50% PWM) the BJT would burn almost 0.6W max, which is satisfactory for my case, fair a small heatsink will do. On the off chance that I had to utilize higher streams, it completely would be a issue tho.
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@jethtran said in Designing a PWM to Analog mini board for fans:
In my case, I as of now attempted a "manual recurrence clear" from 10Hz to a few KHz, and there was not a great one. Moreover, the development board (Duex5) includes a fixed PWM recurrence of 500Hz, so I got to bargain with that. I'm building the model right presently, and I'm as of now mindful of the control scattering. But I'm beneath 100mA, and within the more awful case (approximately 50% PWM) the BJT would burn almost 0.6W max, which is satisfactory for my case, fair a small heatsink will do. On the off chance that I had to utilize higher streams, it completely would be a issue tho.
Are you doing your own pcb from my design? If so, remember to use a big capacitor at the output, and a diode, they are not specified in the schematic I posted. Also, a mid-power BJT would be required (like BD139).
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All the boards have been sent!
Please message me with an email so I can send the board documentation to everyone.
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Hello!
What a great project. Is there any chance to still buy PCB's, or is the design open source? -
@egon-net said in Designing a PWM to Analog mini board for fans:
All the boards have been sent!
Please message me with an email so I can send the board documentation to everyone.
I can't message him, it says "insufficient privileges".
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@teus, if you are interested, there is an alternative design that is based of dc42's idea of passive filtering of a high frequency (hardware) PWM. The design contains three independent channels for up to three fans and works for me. It was done using JLCPCB's online design software and can assembled units can be ordered directly from JLCPCB using their SMT service.
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Hi all, I'm sorry I have been quite busy for personal reasons. I will try to post all the resources in github and share the link today.
Best regards.
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Here it is:
https://github.com/EgonVLC/PWM2Analog
Multisim/Ultiboard files, GERBERS, schematic and build instructions.
I will add further info when possible.
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@egon-net said in Designing a PWM to Analog mini board for fans:
Here it is:
https://github.com/EgonVLC/PWM2Analog
Multisim/Ultiboard files, GERBERS, schematic and build instructions.
I will add further info when possible.
great, thank you!
what version of Ultiboard do you use? -
hi @Egon-Net, I was wondering if there was a way to purchase two preassembled boards?
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Hi, i have 6 preassembled boards left over from my last Batch.
They are from Egons gerber Files and work like a charm.
Feel fre to contact me about it. -
I don't have any more boards, but you can go with S1lencer ones
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