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  • Building and Using a MOSFET Arduino Shield

    Hi MakersBox,I am currently working on two separate projects: I'm turning on/off an electromagnet with a 30v, 60a Power N-Channel MOSFET and turning on/off a neon sign with a relay (I'm unsure if I have the proper relay for the job--I have attached a PDF of the relay's specs to this). I tested out my MOSFET with a LED and a 680 ohm resistor and it worked well, but now I need to connect the electromagnet to the 12v, 30a power supply. I'm planning on connecting my (+)power to a 10k ohm resistor then to the positive wire of the electromagnet. The negative wire of the electromagnet will be connected to the Drain of the MOSFET. The Source will be connected to the (-)ground of the power supply. The Gate to Pin9(my code is connected to this Pin). The only aspect I am unsure about is if my Ar...

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    Hi MakersBox,I am currently working on two separate projects: I'm turning on/off an electromagnet with a 30v, 60a Power N-Channel MOSFET and turning on/off a neon sign with a relay (I'm unsure if I have the proper relay for the job--I have attached a PDF of the relay's specs to this). I tested out my MOSFET with a LED and a 680 ohm resistor and it worked well, but now I need to connect the electromagnet to the 12v, 30a power supply. I'm planning on connecting my (+)power to a 10k ohm resistor then to the positive wire of the electromagnet. The negative wire of the electromagnet will be connected to the Drain of the MOSFET. The Source will be connected to the (-)ground of the power supply. The Gate to Pin9(my code is connected to this Pin). The only aspect I am unsure about is if my Arduino's (-)ground can be connected to the ground of my power supply? I know the Arduino can only handle 12v, 3a max, but can one connect the microcontroller's ground to a 12v, 30a power supply?Secondly, I'm having issues with the relay turning on/off the 6.5kv, 30mA neon transformer. I cut my transformer's hot wire and connected that to two sides of my relay then connected the other two sides of my relay to Pin9 and the Arduino's (-)ground. I have my Arduino powered by a regulated 5v power supply. I have another regulated 12v power supply connected to the 2nd ground and Vin of the Arduino, but I am unsure if this is necessary. Regardless of this, my relay was not switching the power on/off.I have attached images-the first two are from my LED practice and the second two images are images of my relay connection. Please let me know if you need any other information or can help. Thank you, Katie

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  • klk149 followed MakersBox, klee27x and blackfire41163 years ago
  • Building and Using a MOSFET Arduino Shield

    Hi! I have a few questions about MOSFETs and relays if you have some time to answer them.

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  • klk149 commented on blackfire4116's instructable Wiring the MOSFET transistor3 years ago
    Wiring the MOSFET transistor

    Hi! Great tutorial--I have a few questions regarding MOSFETs and relays if you have some time to answer them.

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  • My Top Ten Most Useful Breadboard Tips and Tricks

    Hi klee27x, have you worked with MOSFETs or solid state relays? I have a few questions to ask you if you have the time.

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