simonsez
Well-known member
What the rule about polarity in coupling cap? what happened if it connected in reverse ?
Thank you very much...
Thank you very much...
The first sentence from the OutsideFoil.htm starts with "Some non-electrolytic" which rules out any further referencing to it as the caps in question are electrolytic, and Simonsez's question was/is about particular situation shown on the schematic above and about electrolytic cap orientation. OutsideFoil.htm is very good info but another story IMHO.schmidlin said:I suppose you guys don't subscribe to the outside foil polarity theory?
http://www.aikenamps.com/OutsideFoil.htm
Seems the polarity on the shemo is on target if so.
syn said:the rule is to put it the way that will not pass DC.
syn said:if you reverse polarized cap on the output of an op amp you will pass any DC, that is present at the opamp's output, to the next stage (generally speaking).
abbey road d enfer, again, thank you very much indeed. that is it .damn thing takes forever to fully discharge. lesson learned.abbey road d enfer said:b) the discharge is not complete, and I tend to think this is the case. 4700uF with 100k gives a time-constant of 470seconds. It means it will take about 8 minutes to reduce the voltage down to 30%.
I suggest you power up the beast, discharge the cap with a low value resistor (100R) from output to ground for a few seconds and re-do your measurement. Please note that the voltage may go up momentarily because of DA (dielectric absorption).
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