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In Reply to: Re: Experimenting with Power Supply Filter Caps. posted by Estes on July 08, 1999 at 21:02:28:
I know of the book you are talking about. I have one by Randy Slone that is pretty good also. Strange you should say that the Brits make a big deal of a really good power supply, considering the skimpy one on the Creek. Well it is just $199. Like I said, it is not bad for that price.Clayton
I'm am also not an EE but if you reed the specification for most capacitors there ESR is not optimal at low frequencies. Therefore it would be better to use smaller values and plenty of capacitors in parallel. Please notice the total capacitance should not be too much higher than the original because they would work as a shortcut when empty and the PS might only be optimised (cost optimised) to the original capacitance. If looking at the characteristic of a battery it is much more willing to deliver high currents at low frequencies. I have heard a solution with two auto accumulators (sealed versions!!!(+/-12V)) and two small capacitors (1500uF) and this were one of the best modifications I have heard. You have to be careful with auto accumulators. They would not live long if they are completely discharged and it would not be an audiophile experience to listen when charging. Also the voltages should match the equipment. If possible try with some smaller batteries for the digital and analogue parts just to see (listen) if it is worth it. I have not tried this with my CDP yet so what kind of complications that might occure I have no idea about. If you donīt feel confident with this then better dont try it (batteries contains lots of current!!!!!)(and acid in some cases).
Regards Lasse
I believe I will stick to the caps because I don't trust batteries, even the sealed kind. Had a small 9V battery explode one night in my trash can at about 4:00am. Don't know why this happened. It was in a plastic bag and was not touching anything. It blew the side out of my Rubbermaid.Clayton
and probably scared the hell out of you and the wife. Are you sure that it wasn't a letter from the "Unibomber" in your garbage that blew up?Staggering sizes of caps in parralel is a worthwhile tweak. Another one is to wire low value "bypass" caps in parrelel across the terminals of the larger value caps. This gives the smaller cap the ability to discharge (and supply the initial power on demand) while the larger cap catches up and supplies the reserve on longer sustained demands.
Depending on the materials used in the caps, some are faster or slower to respond to demands. Larger caps tend to be more sluggish, but have more reserve for larger / longer demands. Increasing these would tend to give give a more solid bass foundation and increased sustain / definition. Smaller value caps are quicker and can smooth out high frequency smearing and sibilant problems.
As was pointed out previously, receivers are major offenders in having weak supplies. Old amps from the 70's and more current designs that are underdesigned / budget cut models can also greatly benefit from these tweeks.
Capacitors can store some hefty voltages and can be quite shocking to deal with. If your going to work on something, unplug it from the wall and turn it on. It will discharge the energy stored in the caps relatively quickly and make it much safer to work on. Caps also have polarity and max voltage ratings to them, so be careful with that also. If hooked up backwards or over-volted, you will get to hear a short but loud explosion like that of a firecracker or M-80, depending on the size of the cap. Sean
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It was a little startling. The worst thing was I stumped my toe on the bed post. I am taking this process I am going through one step at a time. The problem with using staggered value caps is space. I am familiar with their benefits by doing that with tweeter xo's. I do this all the time with them. Speaking of xo's, have you got the Woofer Tester up and running yet? What do you think of it? I am thinking about replacing some stuff in it with some tighter tolerence stuff to get rid of the problem with it's inability to accuratly measure inductors under .8 mH and the ability to be a little more accurate with impedances over 12 kHz.Clayton
Your directions were almost perfect (1 minor error that i figured out). The installation was complete until the computer couldn't find the "box". I think that my com port is not set up correctly and will be working on that this weekend. I'll let you know when it's up and running. Thanks for the help..... Sean
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