Posted by EX 450 Owner on November 09, 2011 at 12:03:45 from (50.96.220.145):
In Reply to: O/T electronic Gurus posted by glennster on November 09, 2011 at 11:00:05:
It has been a long time since I looked at a Wien bridge circuit, if memory serves me correctly, the pot would be for a symmetry adjustment of the waveform.
Fixed resistors come in limited values so the purpose of the pot is to be able to tune to a resistance value that you probably wouldn’t be able to find in a standard value fixed resistor.
just tune the circuit put a dot of finger nail polish on the adjustment screw or shaft to the body to lock it tight and forget it.
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Today's Featured Article - The Nuts and Bolts of Fasteners - Part 2 - by Curtis Von Fange. In our previous article we discussed capscrews, bolts, and nuts along with their relative hardness and thread sizes. In this segment we will finish up on our fasteners and then work with ways to keep them from loosening up in the field. Capscrews, bolts and nuts are not the only means of holding two parts together. When dealing with thinner metals like sheet tin, a long bolt and
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