I am trying to build a simple pulsing circuit.

I am using a 4093 NAND logic to pulse a IRF510 FET. The NAND has an input v of 12V, output will be about 12 as well.

The threshold for the IRF510 gate is 2-4V.

I have read about pulldown resistors, but don't quite understand them???

Is a pulldown resistor what I need to bring the voltage to threshold voltage range of 2-4V?

How do you determine the resistance needed to do so, or do I need a voltage divider?

Or do I even need to worry about it since the IRF510 Vgs max is 20V?



My other question is how do I determine the resistor needed between the 4093 NAND output and the IRF510 Gate???

 

The threshold voltage is a point at which the FET just starts to conduct. You want to raise the gate voltage right up to 12 volts to turn it on. The faster, the better. You should place a small resistor in series with the gate to suppress oscillations - about 100 ohms is good.

 

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I appreciated it very much!