Hello everyone, I have designed a circuit with an arduino nano and two shift registers daisy chained, pin QA of the first shift register is connected to an irf520 MOSFET gate, the source connected to gnd, and drain connected to a solenoid which is connected to gnd. the code simply cycles through an array of 8bit binary numbers (1, 2, 4, 8, 16, 32, 64, 128) so that one led is on at a time. I am powering the arduino with a 5v supply, and a seperate power supply for the mosfet and solenoid (benchtop power supply, with adjustable voltage and current).
The issue is that the seperate power supply for the mosfet and solenoid is outputting 0.680A when it needs to be at 1A (when i test the solenoid leads with my multimeter the benchtop supplies the 1A and the solenoid clicks no problem) so I cant seem to get enough current to the solenoid, even though when I do a meter reading on the power rails of that board the power supply gives out 1A and I read one amp.
Also when the pin QA is high the voltage on QA to gate was at 4.8v when the irf520 datasheet says the threshold voltage is between 2-4v so i wanted to reduce this, I started with a 10k resistor, that only brought it down slightly, i ended up on a 47k (the highest I have right now) which got the gate voltage down to 4.5v which is still too high.
I will post a picture of the circuit setup below, does anybody know the best way I could go about reducing the voltage on the MOSFET gate, and increase current to the solenoid through the MOSFET?
one last thing, completely ignore the MOSFET above, it is only the MOSFET underneath, with the green wire that is being used in the circuit.
thanks for your time.
The issue is that the seperate power supply for the mosfet and solenoid is outputting 0.680A when it needs to be at 1A (when i test the solenoid leads with my multimeter the benchtop supplies the 1A and the solenoid clicks no problem) so I cant seem to get enough current to the solenoid, even though when I do a meter reading on the power rails of that board the power supply gives out 1A and I read one amp.
Also when the pin QA is high the voltage on QA to gate was at 4.8v when the irf520 datasheet says the threshold voltage is between 2-4v so i wanted to reduce this, I started with a 10k resistor, that only brought it down slightly, i ended up on a 47k (the highest I have right now) which got the gate voltage down to 4.5v which is still too high.
I will post a picture of the circuit setup below, does anybody know the best way I could go about reducing the voltage on the MOSFET gate, and increase current to the solenoid through the MOSFET?
one last thing, completely ignore the MOSFET above, it is only the MOSFET underneath, with the green wire that is being used in the circuit.
thanks for your time.
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