[sdiy] Shutdown on chip-amp

[neil.johnson97 at ntlworld.com]

Hi,

> > Big N-channel MOSFET (with low rDSon) in the GND line of the power amp
> > circuit.  Drive the gate with a logic signal from the PIC.
> 
> Don't even need a big one or that low a resistance with that little bit of a 
> load.  Radio shack used to sell the VN10KM,  which came in a package that was 
> a variant on a TO92,  and that should do the job...

RDS(on) of a VN10KM is about 5 ohms.  I'd shop around for less than an ohm.  There are even MOSFETs designed for logic switching.

For the stuff I'm designing at the moment, TO-92 is BIG!!!

Cheers,
Neil


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