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You should not use a "naked" L7805CV. That voltage regulator requires a couple of capacitors in order to build a functioning voltage regulator out of it. You should be able to find instructions online for how to build one. Search on "L7805CV circuit" and you should find quite a few sample circuits. That said, 9V is a good unregulated voltage to provide to ...


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The "Arduino" part of your schematic looks OK. 9 VDC to VIN on the Uno is OK. Connecting the MOSFET directly to the Arduino is OK. Personally, I would connect a 1000 ohm resistor in series between the Arduino pin and the gate of the MOSFET. If you like to live dangerously like I do, and change wiring connections with power supplied to your Arduino, then a ...


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In general your circuit is fine, but the parts are pretty overpowered. If there is a reasonable voltage drop at the IRF540N you better choose a mosfet with a lower gate-source threshold voltage, if it works I'd say it's fine.


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If my supply increase from 12V 1.5A to 4A. My arduino will draw around 800mA @5V (571mA @7V) plus solenoid 1.2A @12V, is it a good idea to get 12V 4A (48W) power supply? Since Filip Franik told me that it is a good practice to get 2 times the current I need just in case. I know there is the efficiency of the converter is calculated by dividing the output ...


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So you want to use the 5V voltage regulator on the Arduino serve as the supply for your 5V components, and feed the 5V regulator from the 12V supply that powers your solenoid? The problem with that plan is heat. The voltage regulator on the Arduino is a poorly heat-sinked (heat-sunk?) "linear" regulator. A linear voltage regulator is basically a solid state ...


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To make that work you'd need to connect the HV connection to the Vin of the NodeMCU (as well as to the relay board) which should be the 5 V coming form the USB port. You'd also need to connect the GND on the HV side to the GND of the NodeMCU.


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