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Recent content by maxim28

  1. maxim28

    LED That Indicates 'Powered Fan'

    You're right but unfortunately this small fan (10cm diameter for me looks small) is really heavy due to the materials, that's why it need very high current to be driven. I am sorry for the missed info.
  2. maxim28

    LED That Indicates 'Powered Fan'

    An important point missed from the beginning is that despite the small size of that fan, the current to drive it is fairly high, it could be 30-40 Amps or so. That said, it looks like a simple diode solution has to be revised because of the current, and I guess it need a strong job to be cooled...
  3. maxim28

    Proportional cryogenic valve for liquid nitrogen

    Yes, I would find something less expensive... 100 $ would be ideal.
  4. maxim28

    How To Pair The Shaft Of a Cryogenic Valve To a Motor

    Thanks for the answer! I would be grateful, being inexperienced, even if you could show me some model suitable motor and other mechanical components required.
  5. maxim28

    LED That Indicates 'Powered Fan'

    That's ok, thanks guys. There are a lot of solutions to be considered [bigsmile]
  6. maxim28

    LED That Indicates 'Powered Fan'

    Yes, it looks the simplest way to go, since the lamp have to be replaced by the led.
  7. maxim28

    LED That Indicates 'Powered Fan'

    One solution should be using a relè, solenoid in parallel with the led and contacts (NO) wired to the fan powered by Vcc. How to efficiently protect the small led by extra currents due to the coil?
  8. maxim28

    LED That Indicates 'Powered Fan'

    In series honestly I see it hard 'cause the fan still draws about 1A of current... interesting the idea of inserting a current sense resistor... But it would need additional circuitry to drive the LED. Do you have in mind a particular model to suggest?
  9. maxim28

    LED That Indicates 'Powered Fan'

    Hi all, I have a simple problem to fix, but I can not find a solution equally trivial [smile] There is a small fan powered at 12VDC operated by a thermostat. When the thermostat closes, the fan starts rotating and a small lamp (placed in parallel) switches on to remotely indicate the...
  10. maxim28

    How To Pair The Shaft Of a Cryogenic Valve To a Motor

    Hi guys Have to replace a manual cryogenic valve with a motorized one, to better regulate the nitrogen liquid flow through a 3/4" steel pipe. Using commercial cryogenic proportional valve is indeed too expansive. The idea is then try to add a motor remotely controlled by Arduino. Here's the...
  11. maxim28

    Proportional cryogenic valve for liquid nitrogen

    Hi guys, I am struggling with a problem which I can not figure out... Having a manual valve for liquid nitrogen in a pipe 3/4" as shown in the red box of the photo: We would add a cyogenic proportional valve in order to be able to regulate its opening by a computer. It looks like I am unable...
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