![]() ![]() I guess I have seen many tutorials with Arduino about running solenoids with BJTs like the TIP120 because those solenoids used require very little current. What other parameters should I look out for with Diodes besides the VRRM? ![]() The values for each are:Ĥ148 - 100V - I also happen to have a 4148 so I guess I could use this one instead. The instructable calls for a 4004 but states a 4001 will do. The diode's most important parameter is the Peak Rep Reverse Voltage from what I gather. Its based on an instructable I found which used a BJT (TIP120) with a 1N4004 diode. I just tried reviewing the set up for a 12VDC/195mA solenoid valve I would be powering from a 12V lead acid battery. I believe that if I understand the parameters of these devices it will help me understand more clearly the differences of how they work. Here is LTSpice and what Id like to know is how to make an analysis where I ramp up the voltage from 0-5V at the gate such that I can study the V and A at different points in the circuit: So it was suggested I try to model it in LTSpice and iCircuit and Id like help making sure my setup is correct. But for now I want to get a clearer picture of what happens in the circuit with a MOSFET when I apply the gate voltage. I also would like to eventually use an optocoupler to separate the circuits just to be on the safe side. I wanted to start with anything I had available but quickly realized I need a Logic Level MOSFET and I need to carefully wire my circuit with a fuse for the lead acid battery (12V) powering the 12V/2.5A or 12V/350mA valve options I have. Ive seen about 10 videos on youtube which are quite helpdul and so far I understand I need to choose my MOSFET correctly. I thought I understood BJTs until I ran into MOSFETs. Im tyring to get into my first solenoid project and I started learning about mosfets.
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