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In Reply to: RE: huge parallel capacitor to the power cord: why bad? posted by dave789 on August 09, 2014 at 16:58:21
Because the 'huge' capacitors belong on the DC side of the power supply where they are most effective at smoothing 50/60Hz ripple after the rectifier.
It wouldn't make sense to try to 'smooth' the 50/60Hz AC before the power supply transformer as the transformer is designed to work from a 50/60Hz sinewave.
What you will often find are smaller capacitance / higher voltage capacitors on the AC primary side of the transformer to help filter higher frequency noise and transients (spikes) but not to 'knock down' the 50/60Hz sinewave peaks.
And what's the relevance of that green 3-way adapter pictured in your post?
Follow Ups:
"Because the 'huge' capacitors belong on the DC side of the power supply where they are most effective at smoothing 50/60Hz ripple after the rectifier.
It wouldn't make sense to try to 'smooth' the 50/60Hz AC before the power supply transformer as the transformer is designed to work from a 50/60Hz sinewave.
"
If you increase the capacitor on the DC side, the current pulse from the wall becomes narrower in time and higher in peak current value.
An ideal sinusoidal voltage source will have no problem with this, but a real world AC power will have a problem. That is why I consider huge AC capacitor.
A mecanical analoge: a capacitor in parallel to an amplifier's AC power input is like a fly wheel connected to a piston engine.
So is an inductor in series. LCR filters on the primary side are not uncommon.
What are you trying to accomplish?
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