RadioBanter - View Single Post - Overvoltage and reverse voltage protection

January 11th 04, 10:23 PM

On Sun, 11 Jan 2004 21:17:43 -0000, (Dave Platt)
wrote:

Another trick I've seen is to use a hefty power MOSFET (one with a low
Rds[on]), with the source and drain leads reversed, in series with the
power. Depending on the voltages involved, you can either connect the
gate directly to the opposite side of the power supply, or (if the
supply voltage may exceed the Vgs limit) to a high-Z resistive divider.

Nice one Dave