Hello folks,

I am not certain this will be answered or not. Either way here goes:


I was tinkering around with a hasbro sound and wondered why transistors are used in the upgraded wiring instead of mosfets.

So I hooked up a mosfet in the typical fashion to the speaker negative and used a white cree xp2... It was getting too much juice (full power not usual on speaker gnd). I resistored it.

Now when the power is turned off, the led with thr mosfet is still on. It slowly turns down.

Is this because the mosfet gate takes such little current that it is still being utilized?

or does the mosfet itself act as a capacitor and has a residual charge?

anyway to eliminate this issue?

thanks.


PS. the issue is livable, I am attempting to use 3 mosfets on a obiwan clonewars sound board and a tri-cree. I have 3.7v liion capable of 4 amp discharge. Because voltage drop across a mosfet is less than the tip42c....