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Old 21st February 2012, 07:23 PM   #21
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Thanks for the heads-up. I don't visit that forum very often.
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Old 21st February 2012, 08:26 PM   #22
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Quote:
Originally Posted by Koifarm View Post
The reason i use two capacitors in the output from the headphoneamp is the size of them. one 50v capacitor is higher them 2 x 25v capacitors. Now the PCB fits in a 50mm high housing. Futher i parallel them with a 4,7uf MKP wima capacitor. This is a personal preference.
Such preference as pictured on schematic leads to higher distortions and earlier death of the capacitor that is connected in reverse polarity. Also, another capacitor sees more than 25 volt and can die quite quickly damaging headphones and possibly ears. If it is your preference to have damaged headphones and ears, good luck, but be aware of lawyers if you sell such amps to somebody.
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Old 21st February 2012, 08:59 PM   #23
Koifarm is offline Koifarm  Netherlands
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Wavebourn, the maximum voltage drop over the two capacitors is 36Volts.
That is 18V for one capacitor. Distorsion values are lower as using one elco.

Manifactures as Shanling, Burmester and MCintosh uses the two serie elcos a long time in they equipment.

But every one is free to use elcos with higher voltages. The PCB can be used with one output capacitor, two output capacitors in serie, two output capacitors paralell and two output capacitors in serie with one paralell.

And i will sell nothing, this is a DIY forum.

Ronny
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Old 21st February 2012, 09:03 PM   #24
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If Shanling, Burmester and MCintosh used electrolytics in reverse polarity like you they would not survive at all.
It was my last warning, I am not going to try to explain you anymore that as drawn on schematic capacitors are reverse biased. If you still don't understand what that means I assume it is forever.
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Last edited by Wavebourn; 21st February 2012 at 09:06 PM.
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Old 21st February 2012, 09:14 PM   #25
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Ronny it's not about the voltage over the capacitors or using one instead of two but that one of them is connected in reverse.

BTW the etching of the print failed today because the etch fluid was too diluted. They didn't have enough etchant so they put some water in to dilute it further but it was too weak.

So I got some more etchant and will try again tomorrow.

Last edited by mace1337; 21st February 2012 at 09:19 PM.
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Old 21st February 2012, 10:09 PM   #26
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I'm going to buy a dozen from ebay... how do you go about matching them?
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Old 22nd February 2012, 11:28 AM   #27
Koifarm is offline Koifarm  Netherlands
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Quote:
Originally Posted by mace1337 View Post
Ronny it's not about the voltage over the capacitors or using one instead of two but that one of them is connected in reverse.
Oke Guys, this is not rocketscience just elementairy physics.
When you connect two of the same polair condensors in serie( with same polarity connected) they act as one non(bi)polair condensator with double voltage and half the capacity.

See also here:

How to make bipolar caps?

Last edited by Koifarm; 22nd February 2012 at 11:38 AM.
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Old 22nd February 2012, 02:00 PM   #28
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Ah right. Well I was just curious.

In any case I won't be making the headphone version so it doesn't matter.
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Old 22nd February 2012, 04:04 PM   #29
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Quote:
Originally Posted by Koifarm View Post
Oke Guys, this is not rocketscience just elementairy physics.
]
It's not physics that you ignore, it's chemistry.
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Old 22nd February 2012, 04:44 PM   #30
jane is offline jane  Norway
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Quote:
Originally Posted by Koifarm View Post
When you connect two of the same polair condensors in serie( with same polarity connected) they act as one non(bi)polair condensator with double voltage and half the capacity.
If you have two equal capacitors in serial in a DC-circuit the total DC-voltage will divide equal over each capacitor. If one cap is in reverse polarity, the standing DC-voltage over this cap will also be in reverse.
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