Hey guys, new member. Experienced at soldering/some BGA and repaired some 32+ electronics (I'm sure that's nothing special around here). I started all of this around 15 months ago so I'm still learning and have gaps in my knowledge.
I had a question about replacing ultra low impedance caps and other caps in general.
1. When replacing 3300uf 6.3v (Nichicon Hm series) with an impedance of about 9 mOhms, is it suitable going with Nichicon UHW at 17 mOhm and closely matched ripple handling? Or Panasonic FR at 18 mOhms and fair ripple handling?
2. I've heard that when replacing electrolytics with polymers, you're supposed to cut the capacitance to 1/2 or 1/3 depending. Does this remain true for ultra low impedance electrolytics as well, or should you keep the capacitance the same due to both being high end caps?
3. I'm attempting to put together a list of suitable replacement caps for 5 versions of disc drives. I had great success with a proof of concept test run. Inappropriate dimension caps. However, most SMD caps I can't identify the manufacturer/series. To me, they appear as polymers due to not having any visible vent - even under the microscope. Do some electrolytics not have vents? One particular example being a SMD 220uf 6.3v. Or could they be hybrids?
Finding suitable replacements for the disc drives has been quite a nuisance due to treading territory where few or none have gone before as well as the form factor of some caps (6mm seated height). Would like to open up my options outside of electrolytics.
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