Odp: [sdiy] 1/8th inch questions

[Tim Ressel]

Um, er, are we worried about protecting the opamp, or
protecting the resistor?? If we're really worried
about it, we can use flame-proof resistors. Come to
think of it, the way I design, I probably should
anyway  :-)

--TR

--- Grant Richter <grichter at asapnet.net> wrote:
> > 2) accidentally patching two outputs together can
> go well beyond short
> > circuit.
> > So you still want some current limiting as
> protection.
> 
> Also if you do the math:
> 
> 15 volts / 1000 ohms = 15 milliamps x 15 volts = 225
> milliwatts
> 
> So 1K is the smallest value resistor the will
> sustain a continuos fault
> current with out exceeding the dissipation rating of
> a 1/4 watt resistor.
> 
> Not that there is anything wrong with using 100 or
> 470. But a 1K 1/4 watt is
> very safe from a reliability standpoint.
> 


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