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Old 25th December 2011, 10:59 PM   #3861
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Quote:
Originally Posted by Holger Barske View Post
Be assured: No problems with quality. And of course no problems with soldering, as boards are tinned (as is every professional made pcb unlesse you don't want it).
I second that .
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Old 26th December 2011, 12:20 AM   #3862
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Ok, why not try it. Although this design needs a lot of ( mostly inexpensive ) parts we where trying from the beginning to make it economical. Lets use that supplier from China.
Red boards with tinned copper.
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Old 26th December 2011, 02:39 AM   #3863
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There is another effect in bipolar transistors i did not mention : the Kirk effect.
Here is some information:
Bipolar Junction Transistors
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Old 26th December 2011, 03:17 AM   #3864
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Ricardo, for this kind of project i usually use Wima FKP1 2,5%. They are PP film and foil.
Very good and inexpensive. When you parallel them you get even closer tolerance because they even out (Douglas Self). For example you can use 4 x 10nF plus 470pF plus 330pF.
You can also use 6,8nF everywhere : 2 x 6,8nF = 13,6nF and 6 x 6,8nF = 40,8nF.

Last edited by Joachim Gerhard; 26th December 2011 at 03:22 AM.
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Old 26th December 2011, 03:28 AM   #3865
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Default Merry Christmas my friend

Hi Joachim,

Merry Christmas to you and your family

BTW I also use the FKP1 and the Siemens caps I like them.


atb,


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Old 26th December 2011, 03:54 AM   #3866
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We both like the same. It´s a miracle.
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Old 26th December 2011, 03:55 AM   #3867
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Hesener, please make space for the Wima 6,8nF FKP1. I think that is a good solution.
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Old 26th December 2011, 04:04 AM   #3868
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Default Miracle

Hi Joachim,

Yes we like the same things it seems
We both are awake also and we both like to make things better.

The biggest difference between us is that you are blond and I have black hair

Beautiful and crazy at the same time isn't it?

Thanks for all your support in this thread, it's just great !

atb,


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Old 26th December 2011, 08:56 AM   #3869
hesener is offline hesener  Germany
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Quote:
Originally Posted by Joachim Gerhard View Post
Hesener, please make space for the Wima 6,8nF FKP1. I think that is a good solution.
ok no problem
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Old 26th December 2011, 08:59 AM   #3870
hesener is offline hesener  Germany
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Quote:
Originally Posted by RCruz View Post
Regarding the Riaa caps, I see 2 x 20.4nF and 2 x 6.8nF

The 6.8 value (6800pf) is easy to find and my 1st choice would be Relcaps RTE - Polystyrene Film & Tin Foil, but 20.4 .... Can not find it anywhere.
HiRicardo,

my first approach was to put place for two caps so people could select and put whatever they want in parallel.... anyway, the choice right now is to put Wima FKP1 so I will change the footprint to that, should fit most others anyway.
what is the size and grid spacing of your caps, just curious?
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