Electric Stapler

Discussion in 'General Electronics Chat' started by R!f@@, Apr 18, 2017.

  1. R!f@@

    Thread Starter AAC Fanatic!

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    Does any one have a schematic for an Electric Stapler gun ?
     
  2. AlbertHall

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    Jun 4, 2014
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    A switch and a solenoid? Is there anything more in there?
     
  3. MaxHeadRoom

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    Design or repair?
    Max.
     
  4. RichardO

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    May 4, 2013
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    This one?
    upload_2017-4-18_16-11-19.jpeg
     
  5. shortbus

    AAC Fanatic!

    Sep 30, 2009
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    If your going to staple electricity, make sure your grounded. :)
     
  6. R!f@@

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    I like the response I get when I ask incomplete questions. :D

    Me got an Arrow brand Stapler

    It was bought from Ebay and shipped via MyUS.com

    Too bad the one who bought never realized it was 120VAC

    The FET's are gone. I cannot get the FET's from Aliexpress. :eek:....That was a shocker.
    They are rated at 250V. The ones I got are 100V. One N and a P channel.

    I replaced the FET and get's fried at 120VAC, No wonder.
    I replaced them and tried at 85VAC.
    I could get around 20 staples and FET's get fried due to heat.
    Motor won't load below 80VAC.

    So I am thinking of building one. I can get the desired DC.
    But before that just wanna know if I can get my hands on a 220VAC circuit, the original one uses a bridge without a cap and a MOSFET pair plus a μC.
    I cannot give 220VAC to the original FET's as they are under rated.
    And the ones I can get fries at 120VAC. :(
     
    Last edited: Apr 19, 2017
  7. R!f@@

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    By the way this is used in the stapler.
    I believe it is a sensor. Any idea about the data

    1.jpg

    2.jpg
     
  8. bertus

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    Apr 5, 2008
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    Hello,

    Looking at the text VH2 it could be some hall sensor.

    Bertus
     
  9. R!f@@

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    I believe so.
    Any luck on the data
     
  10. bertus

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  11. MaxHeadRoom

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    If a simple omni polar Hall device, the Honeywell SS400 series might sub.
    Max.
     
  12. R!f@@

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    I guess I need to do some research
     
  13. R!f@@

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    It is a hall sensor.
    5V and VH2 toggles low when magnet passes over.

    Time to design one.

    I am having a bit of a trouble figuring out how to switch the N-ch MOSFET.
    I will be using 2 IRF840 in paralled. A 500V, 8A one. Vgs is ±20V.
    I am gonna use F629 for the job. So the drive will be a 5V coupled with an opto.
    Input is 80V DC.

    I am sketching some idea how to switch on the MOSET to full ON.
    I believe the MOSFET might be damaged at 80V gate voltage, right ?

    I like any idea if you guys have any.
     
    Last edited: Apr 21, 2017
  14. GopherT

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    Most MOSFETS don't like more than 20v to gate. Add a 10V Zener from Gate to Source. Make sure Gate resistor is sized not to exceed the Zener wattage.

    You can also use a simple voltage divider (resistor pair) if supply voltage is known and not spiking from an inductor/motor.
     
    R!f@@ likes this.
  15. R!f@@

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    I too was thinking of limiting Vgs using a zener.
    There will be spiking as I do not have any other voltage source for gate.
     
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