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

 

A switch and a solenoid? Is there anything more in there?

 

Design or repair?
Max.

 

This one?

 

If your going to staple electricity, make sure your grounded.

 

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

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. ....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.

 

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

 

Hello,

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

Bertus

 

I believe so.
Any luck on the data

 

Hello,

Not really, but a search using the number gave me this:
https://sensing.honeywell.com/SS351AT-omnipolar
Strange enough, the number does not show up on that page.
It could be the sensor as OEM.

Bertus

 

If a simple omni polar Hall device, the Honeywell SS400 series might sub.
Max.

 

I guess I need to do some research

 

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.

 

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.

 

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.