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Topic: Mosfet -pmw to gate resistor (Read 377 times) previous topic - next topic

lax123

Hi,

i want to controll an RGB Ledstrip via ardu pwm.

Is the following true:
-you dont need a resistor (like 100 Ohms) between gate and ardu output.
-you dont need a resistor of like 100k from gate to gnd.

Could you help me with these questions please?

CrossRoads

-you dont need a resistor (like 100 Ohms) between gate and ardu output.  FALSE.  This limits the current flow into the MOSFET gate capacitance and prevents arduino pin damage.  I'd recommend 150, 180 ohm
5V/150ohm = 33mA

-you dont need a resistor of like 100k from gate to gnd. Up to you - if you don't care about the gate floating while the arduino starts and eventually controlling the pin, you can leave it off.  Otherwise, add it so your N-channel MOSFET is off while the arduino starts up.
Designing & building electrical circuits for over 25 years. Check out the ATMega1284P based Bobuino and other '328P & '1284P creations & offerings at  www.crossroadsfencing.com/BobuinoRev17.
Arduino for Teens available at Amazon.com.

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lax123

thank you.

too bad that there is so much false information in the www

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