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    Designing a PWM to Analog mini board for fans

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    • Egon.Netundefined
      Egon.Net @NexxCat
      last edited by

      @nexxcat said in Designing a PWM to Analog mini board for fans:

      @egon-net Out of interest. What would the cost be per board, delivered to the UK? Do you think they could be assembled with a fine tipped soldering iron, or only hot air?

      Regarding cost, this is what I thought:

      • Just a bare board: 4€/piece
      • DIY kit (without headers/jumpers): 8€/kit
      • Fully assembled and tested (with optional headers/jumpers): 15€/piece
      • Shipping costs to UK: 5€

      Regarding building the board with a fine soldering iron... It could be done since every part has its legs exposed and parts are not that small (SOIC8 & 0805 SMD), but it would be much more difficult.

      NexxCatundefined 1 Reply Last reply Reply Quote 0
      • NexxCatundefined
        NexxCat @Egon.Net
        last edited by

        @egon-net Thanks 🙂 I'll hold off for now then, but great work on the product!

        Egon.Netundefined 1 Reply Last reply Reply Quote 0
        • Egon.Netundefined
          Egon.Net @Egon.Net
          last edited by

          This is the new board:

          25045719-bfcd-44fc-bc67-476e5524c02f-image.png

          It's a bit bigger so now the capacitor is included and the diode and the led are in top side. Also a bit more of space surrounding the in/out connectors.

          BTW, I think it's the last board I make with Ultiboard. I have tested Kicad and its support for footprints is way better (I can directly import them from Mouser!)

          zaptaundefined 1 Reply Last reply Reply Quote 0
          • Egon.Netundefined
            Egon.Net @NexxCat
            last edited by

            @nexxcat said in Designing a PWM to Analog mini board for fans:

            @egon-net Thanks 🙂 I'll hold off for now then, but great work on the product!

            Thanks!

            1 Reply Last reply Reply Quote 0
            • zaptaundefined
              zapta @NexxCat
              last edited by

              @nexxcat said in Designing a PWM to Analog mini board for fans:

              Do you think they could be assembled with a fine tipped soldering iron, or only hot air?

              You can practice with one of those Aliexpress kits https://www.aliexpress.com/item/1005002070994262.html . It's not that difficult once you get used to it, especially SOIC and 0805 packages which are relatively on the large side.

              https://www.aliexpress.com/item/1005002070994262.html

              1 Reply Last reply Reply Quote 0
              • zaptaundefined
                zapta @Egon.Net
                last edited by

                @egon-net said in Designing a PWM to Analog mini board for fans:

                BTW, I think it's the last board I make with Ultiboard.

                Most likely Kicad will give you nicer 3D renderings. 😉

                Sometime people also post hard to find models on sites such as grabcad or gitbub.

                Egon.Netundefined 1 Reply Last reply Reply Quote 0
                • Egon.Netundefined
                  Egon.Net @zapta
                  last edited by

                  @zapta said in Designing a PWM to Analog mini board for fans:

                  @egon-net said in Designing a PWM to Analog mini board for fans:

                  BTW, I think it's the last board I make with Ultiboard.

                  Most likely Kicad will give you nicer 3D renderings. 😉

                  In fact, Ultiboard renders are VERY ugly xDD. In 1998, when I started using it, it was like "wooha!". But now it's 2021, and it's the very same render 😆

                  It's just that I can go from Multisim to Ultiboard comfortably, and Multisim has a powerful analog spice simulator which I use a lot. I'm trying to transition to TINA TI + KiCad. I wish KiCad had a good spice simulator!

                  zaptaundefined 1 Reply Last reply Reply Quote 0
                  • zaptaundefined
                    zapta @Egon.Net
                    last edited by

                    @egon-net said in Designing a PWM to Analog mini board for fans:

                    I'm trying to transition to TINA TI + KiCad

                    If paying for a subscription is an option for you, take a look at https://www.circuitlab.com/ . It has a more modern front end, works in a browser and has a cleaner user interface, and has nice feature such as sharing your schematic and simulation with others.

                    Most of my projects are digital so in the rare cases I need a simulator I use https://en.wikipedia.org/wiki/LTspice (free, powerful, dated user interface like most circuit simulators).

                    Egon.Netundefined 1 Reply Last reply Reply Quote 0
                    • Egon.Netundefined
                      Egon.Net @zapta
                      last edited by

                      @zapta said in Designing a PWM to Analog mini board for fans:

                      @egon-net said in Designing a PWM to Analog mini board for fans:

                      I'm trying to transition to TINA TI + KiCad

                      If paying for a subscription is an option for you, take a look at https://www.circuitlab.com/ . It has a more modern front end, works in a browser and has a cleaner user interface, and has nice feature such as sharing your schematic and simulation with others.

                      Most of my projects are digital so in the rare cases I need a simulator I use https://en.wikipedia.org/wiki/LTspice (free, powerful, dated user interface like most circuit simulators).

                      I'm trying to get used to TINA TI because it has most of TI spice models and it's fairly accurate (I do a lot of analog designs). Its transient analysis is the most accurate I've found to date. But thanks for the suggestions! I'll have a look 🙂

                      Egon.Netundefined 1 Reply Last reply Reply Quote 0
                      • Egon.Netundefined
                        Egon.Net @Egon.Net
                        last edited by

                        25 board batch on its way!

                        • Parts ordered to Mouser ✔
                        • Boards ordered to JLCPCB ✔

                        Waiting...

                        Egon.Netundefined 1 Reply Last reply Reply Quote 1
                        • zaptaundefined
                          zapta
                          last edited by

                          Do fan manufacturer provide graphs of CFM vs voltage? Is this something that can easily be measured?

                          Now that you have good control of the fan, would be interesting to know for example what 50% voltage means in cooling terms.

                          Egon.Netundefined 1 Reply Last reply Reply Quote 0
                          • Egon.Netundefined
                            Egon.Net @zapta
                            last edited by

                            @zapta said in Designing a PWM to Analog mini board for fans:

                            Do fan manufacturer provide graphs of CFM vs voltage? Is this something that can easily be measured?

                            Now that you have good control of the fan, would be interesting to know for example what 50% voltage means in cooling terms.

                            I don't even thing that the manufacturer expects you to run the fan at other voltage than nominal... If I had some way to measure air flow I could perform some measurements, something like displacement of a suspended weight or the like.

                            1 Reply Last reply Reply Quote 0
                            • Egon.Netundefined
                              Egon.Net @Egon.Net
                              last edited by

                              @egon-net said in Designing a PWM to Analog mini board for fans:

                              25 board batch on its way!

                              • Parts ordered to Mouser ✔
                              • Boards ordered to JLCPCB ✔
                              • Parts arrived from Mouser ✔
                              • Boards in their way from JLCPCB ✔

                              Waiting...

                              Egon.Netundefined 1 Reply Last reply Reply Quote 2
                              • Egon.Netundefined
                                Egon.Net @Egon.Net
                                last edited by

                                @egon-net said in Designing a PWM to Analog mini board for fans:

                                @egon-net said in Designing a PWM to Analog mini board for fans:

                                25 board batch on its way!

                                • Parts ordered to Mouser ✔
                                • Boards ordered to JLCPCB ✔
                                • Parts arrived from Mouser ✔
                                • Boards in their way from JLCPCB ✔

                                Waiting...

                                • Boards arrived from JLCPCB ✔

                                It all seems ok, so I will build the boards and send them as soon as posible 🙂

                                Egon.Netundefined 1 Reply Last reply Reply Quote 2
                                • Egon.Netundefined
                                  Egon.Net @Egon.Net
                                  last edited by

                                  First board assembled and tested!
                                  PWM-1.1.jpg

                                  You can see the new integrated electrolytic capacitor, smd diode and led. I'll try to assemble/pack all boards this weekend, and send them early next week.

                                  zaptaundefined 1 Reply Last reply Reply Quote 2
                                  • zaptaundefined
                                    zapta @Egon.Net
                                    last edited by

                                    Looks very nice. Now when somebody will complain that fan X doesn't work with PWM we can point them here. 😉

                                    Egon.Netundefined 1 Reply Last reply Reply Quote 1
                                    • S1lencerundefined
                                      S1lencer
                                      last edited by

                                      If there are any Boards left, icould use 4 of the.

                                      Egon.Netundefined 1 Reply Last reply Reply Quote 0
                                      • Egon.Netundefined
                                        Egon.Net @zapta
                                        last edited by

                                        @zapta said in Designing a PWM to Analog mini board for fans:

                                        Looks very nice. Now when somebody will complain that fan X doesn't work with PWM we can point them here. 😉

                                        Thanks @zapta 🙂

                                        1 Reply Last reply Reply Quote 0
                                        • Egon.Netundefined
                                          Egon.Net @S1lencer
                                          last edited by

                                          @s1lencer said in Designing a PWM to Analog mini board for fans:

                                          If there are any Boards left, icould use 4 of the.

                                          I've just reserved the last board 😞

                                          I still have 5 spare pcb boards, but not all the components: I have the resistors/capacitors/opamp, but I don't have the electrolytic capacitor, diode and led. Could that suit you?

                                          I usually put orders to mouser every other month or so, so if u can wait maybe I'll can add the parts in my next order. Or if there are more people interested, I can run another batch.

                                          1 Reply Last reply Reply Quote 0
                                          • JethTranundefined
                                            JethTran
                                            last edited by

                                            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.

                                            Egon.Netundefined 1 Reply Last reply Reply Quote 0
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