[sdiy] Trimpots

[dan snazelle]

 a trimpot can be in a circuit to allow for variation 

maybe it wasnt a good idea but I included one on my Tracer City filterbox to allow for different ranges of input signal...for example a guitar might sound better with the INITIAL cutoff at one point and Drums at another

so I added it to the bottom of the PCB which is easily accessible....I like knowing that I can change the character for each and every box with a simple 30cent trimmer and a screwdriver.





On Aug 9, 2011, at 8:45 AM, Harry Bissell wrote:

> 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
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