At 1:29 PM -0800 1/19/01, Winsor Crosby wrote:
>
>This concern with VRs presumes that somehow the circuit components
>will not change value with age and use. That just is not true.
Well designed circuits with properly rated components of very high quality
will stay the same for extremely long periods of use. Pots (VR's) get
dirty, corrode, and take up more space than a fixed resistor of equal
wattage. It is common during an adjustment of a circuit with VR's to have
to clean them. For circuits where predicting the appropriate value of the
resistor is impossible and/or where size doesn't matter, then VR's are a
quick and easy solution...
Be seeing you.
Dirk Wright
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