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Old 11th August 2002, 06:54 PM   #1
wchick is offline wchick  United States
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Default Power supply capacitors

Hi all,

Will 62000 uF, 40VDC capacitors good enough for Aleph 5 power supply? I'm concerned that 40VDC is not high enough because I saw others used 63 to 100V or higher. Also some capacitors have unit in MFD, what is it? Any thing similar to uF? Thanks for you advice.

Wallace
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Old 11th August 2002, 07:04 PM   #2
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Hi Wallace,

As long as you're running the standard 34VDC rail voltage, you will be fine, assuming you have good capacitors. You might want to search the forum for more information on using older electrolytics, or used electrolytics. There has been a lot of interesting discussion on the subject.

Rodd Yamas***a
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Old 11th August 2002, 07:18 PM   #3
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The cappacitors will be enough but in my experience it will sound better to use more and smaller caps like 4*33000uF for example.
Big cappacitors tend to sound slow and heavy.
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Old 11th August 2002, 07:26 PM   #4
wchick is offline wchick  United States
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Default What is MFD and uF, same or different thing?

Thanks for the responses, one thing still confusing me is the MFD and uF of caps. Are they the same thing or not? Thanks.

Wallace
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Old 11th August 2002, 07:34 PM   #5
trwh is offline trwh  United Kingdom
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"Big cappacitors tend to sound slow and heavy."

Hmmm. It is certainly often cheaper and more convenient to use many smaller capacitors in parallel instead of one larger one.

wchick, yes MFD and uF are the same thing. I too found this confusing - I have seen some schematics where 1000uF was written 1M0, which could have meant 1mF = 1000uF (it was), 1uF, or 1MF (not likely!)

Thanks,
TRWH.
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Old 11th August 2002, 07:37 PM   #6
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You have it MFD and UF stand for the same thing. That is .000001F = 1MFD = 1UF and there is another way to
write this but I haven't learned it yet.


Regards, bob12345678
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Old 12th August 2002, 10:08 AM   #7
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about "the big caps tend to be slow"-thing
place a few different small caps in parallel over the huge one, this works fine

HB.
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Old 12th August 2002, 10:27 AM   #8
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Default power supply caps

Quote:
Originally posted by bob12345678
You have it MFD and UF stand for the same thing. That is .000001F = 1MFD = 1UF and there is another way to
write this but I haven't learned it yet.


Regards, bob12345678
No, not at all! 1mF=1000uF.
1MF=10^6F.
Let's keep this straight: m=milli, M=mega,u=micro
Not just in caps, also for instance in freq (1MHz=10^6Hz, 1mHz=.001Hz). So 1mF=.001F=1000uF. Sometimes on older diagrams you see 1uuF, which is just 10^-6X10^-6 or 1pF.
1mH=1000uF=10^-6H. 1MH should be quite a coil...
1MOhms=10^6Ohms, while 1mOhms=.001Ohms.
1MV=10^6volts, 1mV=.001V, 1uV=.001mV=10^-6V
1mm=.001meter.
You get the point.



Cheers, Jan Didden
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Old 12th August 2002, 11:31 AM   #9
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Of cource you are right Hugobross, 1K across the 60K helps a lot, but in my case 4 times 33 was even better. Maybe its just that the Philipps are better than the spragues?
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Old 12th August 2002, 11:35 AM   #10
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Janneman, thanks for that! I should print it out and put it on the wall because i allways get nervoes about the different ways to express the values.
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