mosfet control

  1. S

    Can someone help me please!!!? IRFZ44n MOSFET heats up driving TEC Peltier

    Hello everyone, I would really appreciate if you could help me Im making a mini fridge controller (PID), using a 4n25 optocoupler, an IRFZ44n Mosfet and a tec peltier I connect it to a 12v and 3 A and arduino 5v As soon as the arduino code is uploaded and I connect it, the mosfet starts to...
  2. M

    drive mosfet with 3.3V, minimal component count

    i have a 3.3v digital pin, attempting to use a PNP to switch an Nfet (Vdrain=5v) on/off at a rate of 1kHz. i can't use the inverting-NPN method to drive the gate because that way the Nfet would be on for a few mS after POR. Here's my circuit with a minimal # of parts: Am i full of it? Is there...
  3. fablau

    Why did this zener diode explode?

    Hello everyone. Please, help me to understand why D1 of the circuit below exploded when I increased the voltage to 32v. Everything was working perfectly at 22V, then I increased the voltage to 32v and D1 exploded. As you can see from the schematics, that diode drives nine N-Channel MOSFETS when...
  4. 2

    Strange voltage spikes in MOSFET gate driver

    Hello, I have designed a TL494 half bridge power supply which simulates fine in LTspice but has some problems when soldered on a board and I can not figure out how to fix them. Schematic pictures are attached. 1. If I connect GDT1 and GDT2 as seen in the schematic pictures, the output...
  5. KaputFPV

    Mosfet array for low voltage and low current

    (I am quite new to electronics and pcb design.) (necessary files are attached, tell me if you need something else ) ------------------------------------------------------------------------------------------------------------------------------------------- Hi everyone, I am making a MOSFET...
  6. K

    P-MOS LED Load Current

    For the circuit below, how do you compute the current flowing from LED to 200R resistor? Without the p-mos the current is around ~8-9mA depending on Vled drop, but when there's p-mos the current was limited to 3mA.
  7. Kadav

    Is it possible to control the Output of a motor using PWM ?

    Hello i am trying to create a PID system with arduino and motor and im trying to varry the motor speed as the PV reaches the setpoint.... So the power comes from the arduino (replaced the arduino by a POT for demonstration purposes )and goes to the gate of a MOSFET , but i thaught the MOSFET...
  8. Rossosaurus

    Need a hand understanding a section on datasheet example schematic (CYPD3177 USB-C Controller)

    Hi all. I'm currently designing a circuit using a CYPD3177 USB Type C Controller to change the output voltage of a USB C power supply with power delivery support. I was looking at the example schematic in the datasheet to understand how the chip is used but I'm struggling to get my head around...
  9. LLofYorkshire

    Mosfet Switching Problem

    Hi, 1st post on the forum and very new to power electronics design, and to electronics in general. I designed the attached circuit to attempt to power on and off a solenoid coil. I have no prior experience of using mosfets, other than using off the shelf H-Bridge modules such as the IBT-2 and...
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