Help needed - MOSFET driven by PWM

[Phil Moore]

Hey Bill,

Remember the piezo driven off a MAX232? ... +/- 10V for not much extra work. Just reference the output to ground to get +10V. You have any spare lines on your level converter?

Phil.

[bcd]

Bing ! The sound of a light bulb coming on.

The Mosfets seems to function ok at 5v, but I hate the idea of underdriving the gate. I've found IRL540 from Futurlec here in Oz whcih have the logic drive input - and for only $0.70 each.

bill.

[earltyso]

For years now I have been running IRF530's with only 5V on the gate 1-3A drain to source current for cheap switchmode devices, I just wanted to second that this does work, not as well as logic level but, for cheap low current switch mode stuff I have had no problem (I always included snubber/flashback diode (D-S) of coarse but for the poor man, linear range is good enough.