[sdiy] Trimpots

[Harry Bissell]

Just a side note (sorry I've been napping a bit here :^)

Measuring a trimpot from one unit, and copying the setting to another unit is
generally useless. Designers do not EVER include trimpots unless they cannot predict
the resistance value they need because of other (unknown or unknowable) variables.

You may as well set the trimpot to mid-rotation, as a good designer will calculate the
nominal range they want to lie at or near that point. The value of the trimpot gives you
an idea as to how variable the setting needs to be.

Offhand, I didn't understand what the trimmers in the (was it) Emulator are for, or I'd try to
be more helpful. I think you should probably look at some circuit points on the scope and
twiddle the pots, try to figure out what they are supposed to do...

(I'd be very wary in a power supply, the thing might become unstable etc.

otoh... Sometimes, a bad designer puts in a trimpot they really don't need...

H^) harry




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-- 
Harry Bissell & Nora Abdullah 4eva