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Old 11th November 2002, 08:03 PM   #11
hifi is offline hifi  Sweden
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you can use as much capacitance as you want... but the caps will probobly donīt last long if you use 41V rails over 40V caps if the AC get up a bit then you might have ~45V over the caps and that they will most certainly not like.

Btw...keep your eyes well clear from the safety vents on the caps!!!!

/micke
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Old 11th November 2002, 08:53 PM   #12
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Hello,

The 40 V capacitors would work ok with 29 V transformer and with Aleph 5 amplifier.

The voltage over the capacitors would be lower
when the power supply will be under load ( Aleph amplifier
connected to it ).
Try to use inductors in the power supply, they will also slightly lowered the PS voltage.

Quote:
Btw...keep your eyes well clear from the safety vents on the caps!!!!
It would be even better to keep entire head away from the capacitors when you are not 100% shure about their specs and limits.

Best regards,
Kristijan Kljucaric
http://web.vip.hr/pcb-design.vip
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Old 12th November 2002, 11:35 AM   #13
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Hi Friends!

Can you tell me the Type and the Value of the Choke if I want to do it that way. This should bring down my Voltage a little bit so that I can use my 40V Caps!
This is exact the layout for MY Power Supply (Thanks Kristijan)

Thank you very much!
Martin
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Old 13th November 2002, 01:29 AM   #14
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Can you tell me the Type and the Value of the Choke if I want to do it that way. This should bring down my Voltage a little bit so that I can use my 40V Caps!

Yes martinschki, you can go with ~4 mH (3.9mH) air-core and you can lower the voltage 1-2 V

I've purchased those capacitors over the e-bay recently and I am not sure if anyone can tell me if they are worthy. For 12pc $50

As well I can't tell what the production date is on them from code?, anyone knows?
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Old 13th November 2002, 01:30 AM   #15
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yet another pic
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Old 13th November 2002, 07:14 AM   #16
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Default Production date

It seems like 39th week of 1987.
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Old 13th November 2002, 03:55 PM   #17
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Oh Noooooooo Is this mean that I can't use them, douughh.

The seler mentioned that they are new and never used, but I will try to recondition them, lets hope that works, becouse they seem to be nice and tall which is what we need for PS in any stronger amp. There should be 6 in one mono block = ~250.000 uF

Any idea haw safe would be to use them.

Thanks rendisha

Trigon
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Old 13th November 2002, 04:05 PM   #18
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Quote:
Originally posted by trigon


Any idea haw safe would be to use them.

There's no danger in using them.
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Old 13th November 2002, 04:24 PM   #19
PedroPO is offline PedroPO  Portugal
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If they work that ok I guess.

the other day I tested a 60yrs old valve radio. The caps were at least 60 yrs(analysing the layers of dust) and it worked just like new!
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Old 13th November 2002, 04:45 PM   #20
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Thanks guys. I am going to give tham a try.



Trigon
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