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In Reply to: RE: Discharge across the terminals of the electrolytic cap..... nt. posted by jea48 on January 12, 2017 at 11:38:23
Thank you Jea48
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Think of it this way, in a charged capacitor, there is "charge" accumulated on the plate we think of as the positive terminal. There is a similar "lack of charge" (for want of a better way of saying it and without getting too technical) on the negative terminal. If you were to connect these two terminals directly, there would be an explosive and instantaneous transfer of charge toward an equilibrium state. If you connect the two terminals via a large value resistor (e.g., 270K ohms or so), then the equilibrium state is reached in a more controllable manner over a longer period of time. If you don't provide for that, the charge just sits there and the capacitor is a potential source of a dangerous jolt. Ground has nothing to do with this. The capacitor is a self-contained system.
Thanks Lew!! That makes great sense. John
If the amp is built 'Properly' the negative terminal on the cap will be tied to ground - but as JEA suggests across the terminals is BEST - w/o reservation.
Happy Listening
6bq5, yes but what was bugging me is that the amp is totally isolated, no connection to earth so this is a virtual gnd. I conclude that there must be a potential difference between the terminals on a cap in order for it to discharge. Education is welcome.
yes but what was bugging me is that the amp is totally isolated, no connection to earth so this is a virtual gnd. I conclude that there must be a potential difference between the terminals on a cap in order for it to discharge. Education is welcome.
Earth ground is not involved. What you are doing is discharging the DC stored energy in the cap by connecting a load, resistor, across the B+ and B- terminals, leads, of the cap.
The cap is connected in parallel with the B+ and B- rails, legs, of the DC power supply. The power supply, where a metal chassis is used, the B- rail of the power supply is connected to the metal chassis. The metal chassis becomes the ground plane for the power supply.
no text
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