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Offline ram
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« Reply #420 on: September 08, 2010, 08:44:35 am »
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hello darren, just asked eugene52 the schematic and pcb w/c is dp double sided he designed. my file was in my usb drive i have to search it. i will post it here if i found.

regards, ram,

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Offline earthope
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« Reply #421 on: September 13, 2010, 10:54:11 am »
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hi all
i have asking around for the parts required for the DP and i have noticed that the capacitors ( C1-C32 ) have different voltages for the same capacitance value, and i got confused which voltage do i take, can any one please advise on this,
please note also that this is my first time ever working on an electronic board so there will lots of other question as i go through this project

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Offline GoldDigger1950
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« Reply #422 on: September 14, 2010, 02:19:54 pm »
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Quote:Posted by earthope
hi all
i have asking around for the parts required for the DP and i have noticed that the capacitors ( C1-C32 ) have different voltages for the same capacitance value, and i got confused which voltage do i take, can any one please advise on this,
please note also that this is my first time ever working on an electronic board so there will lots of other question as i go through this project


The voltage rating on a capacitor is the maximum that the device can sustain without being destroyed by the internal dialectric breaking down. Most designers use a minimum of 10% over the maximum expected voltage. If a capacitor is specified as .1uf 16v, you can substitute it with a .1uf and a higher voltage rating but never lower. The only other limiting factor is the size. If it's too big for your project, don't use it.

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Offline Darren in NC
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« Reply #423 on: September 14, 2010, 08:46:46 pm »
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Quote:Posted by ram
hello darren, just asked eugene52 the schematic and pcb w/c is dp double sided he designed. my file was in my usb drive i have to search it. i will post it here if i found.

regards, ram,


Eugene, I have Sprint Layout 5.0 if you're willing to post the files. Thanks so much!

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« Reply #424 on: September 17, 2010, 09:46:51 am »
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Quote:Posted by GoldDigger1950
The voltage rating on a capacitor is the maximum that the device can sustain without being destroyed by the internal dialectric breaking down. Most designers use a minimum of 10% over the maximum expected voltage. If a capacitor is specified as .1uf 16v, you can substitute it with a .1uf and a higher voltage rating but never lower. The only other limiting factor is the size. If it's too big for your project, don't use it.

thanks GD for the help
but still if you look through the part list provided with this project (by Eugene) you can see that non of the capacitors has a voltage specified, and i wonder if there is an updated list that specifies voltage for the capacitors

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Offline Darren in NC
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« Reply #425 on: September 17, 2010, 01:57:48 pm »
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Use polyester film capacitors @100 volt rating and 5% tolerance. Your number 1 choice of capacitor should be "Polyester Film" then second choice should be "Mylar"

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« Reply #426 on: September 17, 2010, 03:59:08 pm »
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Hi earthope
          - all capacitor(chemical) is specified UF is 16v,25v.(eg.10uf,100uf,220uf,
                   4700uf,10000uf /25v)
          - all capacitor(mk,mylar) is specified nf is 50v,63v,100v. (eg. 1nf,1.5nf,
              10nf,100nf,220nf /50v)(toleranc 5% markite (j) ,(100nf=104 j / 50v).

          - all capacitor(ceramic)  is specified pf is 16v .( eg.c13=15pf,c17=47pf)

 best time
 j.



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Offline cuirava
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« Reply #427 on: September 17, 2010, 04:51:53 pm »
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man I learning something here,thanks a bunch

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Offline raff33
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« Reply #428 on: September 18, 2010, 04:48:58 am »
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hi japanese,
what can the probleme if i do capacitors"Polyester Film"like ( 3x1nf5 400v ) ;( 1nf 250v ) ?

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Offline japanese
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« Reply #429 on: September 18, 2010, 06:20:18 am »
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Hi raff33
         no probleme for use 250v,400v if you cant get 50v,63v,100v but big size & the
         working voltage is 12v . toleranc 5%.
 best time
 j.

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