Small Mosfet transistor to high power Mosfet driver
This is quick tip on how to drive a power mosfet transistor with a small one. Let's say that we would like to drive a pump with a wireless signal and that we have one of those boards with a N channel mosfets on:
We need to make a few modifications:
Connect D3 and D4 with a bridge, change a D1 diode with a 1k resistor and connect:
Those changes make up to this schematics:
And here are the signals:
The blue signal is the output from the digital pin D3( PWM ), and the yellow signal is the signal on the gate of the power mosfet, which is a P channel mosfet.