Technosoul Posted June 5, 2009 Report Share Posted June 5, 2009 Hello,I am building a 6582 MBsid with PSU option 1. I have recieved (2) 2200uf16v in smash tv kit but schematics call for 2200uf25v. Is it ok to use the 16v. And if anyone can direct me towards a link or web page that better explains these parts, that would be greatly appreciated.Thanks for your help Quote Link to comment Share on other sites More sharing options...
m00dawg Posted June 5, 2009 Report Share Posted June 5, 2009 Hi Technosoul!It would probably work - I believe I have read on the forums people use the 16Vs. Though it depends on if you are going to use a C64 PSU, etc. Me personally, I would prefer a 25V. This is to allow for voltage spikes on the line, etc. It gives the capacitor a greater tolerance before bad things start to happen. Plus, I think caps rated at higher voltages might last a little longer. *shrug* Quote Link to comment Share on other sites More sharing options...
rosch Posted June 5, 2009 Report Share Posted June 5, 2009 the AC value you measure is just a relative value, the effective voltage. to find out which voltages in fact appear you can multiply the measured AC value with the squareroot of 2. the cap's value should be higher than this voltage peak.i don't know about the particular voltage in 6582, but i guess that it should work if they've come with Smash's kits. Quote Link to comment Share on other sites More sharing options...
Technosoul Posted June 5, 2009 Author Report Share Posted June 5, 2009 question: what usually causes voltage spikes? Quote Link to comment Share on other sites More sharing options...
fussylizard Posted June 5, 2009 Report Share Posted June 5, 2009 I knew I'd seen something about this. From the FAQs on Wilba's docs: http://www.midibox.org/dokuwiki/wilba_mb_6582Is there any reason why 16-volt 2200uF caps cannot be used instead of 25-volt ones?For the 5v supply: no. For the 9v AC after the bridge rectifier: not really. I was told once to expect up to 2x the voltage after the rectivier, i.e. if it's 9v AC, choose capacitor to handle 18v DC. It really doesn't go up that high I think, and caps rated to 15v should be enough.---FWIW I used the caps from Smash's kit on mine and it's been fine. Quote Link to comment Share on other sites More sharing options...
Technosoul Posted June 5, 2009 Author Report Share Posted June 5, 2009 hey thanks. I saw that post in the 6582 documents, but I still wanted to question it just in case. you know. Well. I'm almost done with my pcb. almost time to test. Quote Link to comment Share on other sites More sharing options...
fussylizard Posted June 6, 2009 Report Share Posted June 6, 2009 Well I'm nearly finished with mine and I've been blown away by it. You have a lot of fun to look forward to! Quote Link to comment Share on other sites More sharing options...
Wilba Posted June 6, 2009 Report Share Posted June 6, 2009 SmashTV says those Xicon capacitors may be rated to 16V but can handle much higher. It was his decision to supply 16V rated 2200uF capacitors based on knowing more than I do about these things, i.e. they work, they won't explode, so stop worrying :P Quote Link to comment Share on other sites More sharing options...
tongenerator Posted June 6, 2009 Report Share Posted June 6, 2009 as far as i know the capacitor needs to match at least the voltage that is riunning in the curcuit...if u use a capacitor that can handle more voltage it is probably going to live longer, because it is notgetting stressed so much and not heat up as much... so if u need very good performance with long lifetime within a critical curcuit next to for example warm stuff, u might want higher voltage caps than actually required by the curcuit.mostly the capacitors with less voltage but same capacity are a little cheaper is well...question: what usually causes voltage spikes?this is some nice video.. they have many more videos that explain some stuffrealy interesting :Dhttp://www.furmansound.com/video.php?id=s1 Quote Link to comment Share on other sites More sharing options...
Technosoul Posted June 6, 2009 Author Report Share Posted June 6, 2009 Video is really informative. Furman is doinf a great service. thanks for the link. Quote Link to comment Share on other sites More sharing options...
tongenerator Posted June 6, 2009 Report Share Posted June 6, 2009 grab some chips and a coke :D Quote Link to comment Share on other sites More sharing options...
Technosoul Posted June 6, 2009 Author Report Share Posted June 6, 2009 grab some chips and a coke :Dyeah its long, I'm glad theres no commercials. Quote Link to comment Share on other sites More sharing options...
kroutshev Posted June 22, 2009 Report Share Posted June 22, 2009 Hi All ! 2200 µF 25V caps are higher than 16V, is that a problem with free space between Base and Control Surface boards of MB6582 ? Because i have ordered 25 V and when i compare them to 16 V i'm afraid that they could be too long ???Thanks for your answer !K Quote Link to comment Share on other sites More sharing options...
Wilba Posted June 22, 2009 Report Share Posted June 22, 2009 The 2000uF caps are placed where there's the most vertical space between the PCBs, so I don't think there will be a problem. My original MB-6582 has 16V and 25V yet they're the same size. Quote Link to comment Share on other sites More sharing options...
kroutshev Posted June 23, 2009 Report Share Posted June 23, 2009 Thanks Wilba, just to be sure, my 25 V are 10 mm higher than 16 V of wiki's photo. Do you think there's enough space between boards ??Thanks. Quote Link to comment Share on other sites More sharing options...
Wilba Posted June 24, 2009 Report Share Posted June 24, 2009 There's about 35mm-40mm clearance in that area. Sorry, I can't give an exact answer... Quote Link to comment Share on other sites More sharing options...
madox Posted June 24, 2009 Report Share Posted June 24, 2009 For standard cheapo electrolytics, there is often a recommendation to use capacitance and voltage tolerance quite a bit higher than what the first order circuit model may suggest is necessary. As stated in previous posts, this is to provide sufficiently low impedance at the ferquencies of interest, and to handle power dissipation in the cap.The different capacitor types vary a lot in their physical properties, so using a cap of different type may allow for a lower safety margin in the voltage rating. For example, the cap may present a lower impedance, dissipate less power for a given driving signal.I think if one reads suggestions for power supply capacitance values, and voltage ratings, it would usually be for standard cheapo bulk electrolytic.I don't know anything about what Smash has selected, but it seems that he has done his homework on this. Quote Link to comment Share on other sites More sharing options...
kroutshev Posted June 25, 2009 Report Share Posted June 25, 2009 Ok Thanks for your answers.Bye ! Quote Link to comment Share on other sites More sharing options...
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