Three transistor families exist because one design could not do every job well. The bipolar junction transistor switches cleanly and cheaply at low voltage, the MOSFET switches quickly with almost no drive power, and the IGBT combines a field-effect input with a bipolar output to handle very high power at moderate speed. Knowing which is … Read more
For a beginner wiring exercise, identify the source reference and the load connection before choosing an N-channel or P-channel MOSFET. The gate must be driven relative to its own source. Performance, voltage, loss, and driver requirements still matter when selecting the actual part. Last updated: October 16, 2026 Two polarities in one picture An n-channel … Read more
The choice between a relay and a MOSFET usually comes down to one question that has nothing to do with performance: does the load need to be electrically isolated from your control circuit? Where it does, the relay wins outright. Where it does not, the MOSFET usually wins on everything else. Two ways to switch … Read more
A MOSFET is a switch that is operated by a voltage rather than by a finger, and the reason it matters is the ratio involved: a signal you can barely measure can control a current large enough to burn you. Nearly every modern device that moves power or drives a motor contains several of them. … Read more
Most beginner wiring mistakes with a MOSFET come from one misunderstanding: the gate voltage is measured between the gate and the source, not between the gate and the circuit’s ground. Once that rule is clear, the three terminal names stop being arbitrary and start predicting what a circuit will do. Last updated: October 11, 2026 … Read more
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