Electrolytic polarity - Page 4

Prune · 17th September 2004, 05:56 PM

And what about this one:
http://www.diyaudio.com/forums/attac...&postid=328821
I don't understand why the capacitors are in parallel here...

And this one:
http://www.psaudio.com/products/images/306_1.jpg
How can it work with such tiny caps?

Sch3mat1c · 17th September 2004, 06:55 PM

Quote:

Originally posted by Prune
And what about this one:
http://www.diyaudio.com/forums/attac...&postid=328821
I don't understand why the capacitors are in parallel here...

I doubt the designer does, either. Note that any cap I'm aware of can withstand 3V or less in either direction... it easily reforms under such conditions. There's so little voltage, faliure isn't going to happen either (don't quote me on that, everything dies (to quote Type O Negative) eventually).

The formula to find capacitance has nothing to do with decibels, just ohm's law, capacitive reactance, load current and the maximum tolerated voltage drop.

Quote:

And this one:
http://www.psaudio.com/products/images/306_1.jpg
How can it work with such tiny caps?

Probably in parallel, to shunt rectifier hash.

Tim

Prune · 17th September 2004, 07:07 PM

Diodes do not block DC by themselves, you need large caps. In a thread where the photo (commercial product) was mentioned, the maker said the capacitors couple the AC waveform near the zero-crossing where the diodes do not conduct. Again, I don't see how small caps can do that. Maybe I'll build a transformer model in the simulation instead of using a resistive load and see if it changes anything. As for the first circuit, it's also from a commercial product, an amplifier that's supposed to be very reliable. But I'm wondering if someone messed up the schematic.

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17th September 2004, 05:56 PM	#31
Prune Account Disabled Join Date: Mar 2003 Location: Vancouver	And what about this one: http://www.diyaudio.com/forums/attac...&postid=328821 I don't understand why the capacitors are in parallel here... And this one: http://www.psaudio.com/products/images/306_1.jpg How can it work with such tiny caps?

17th September 2004, 07:07 PM	#33
Prune Account Disabled Join Date: Mar 2003 Location: Vancouver	Diodes do not block DC by themselves, you need large caps. In a thread where the photo (commercial product) was mentioned, the maker said the capacitors couple the AC waveform near the zero-crossing where the diodes do not conduct. Again, I don't see how small caps can do that. Maybe I'll build a transformer model in the simulation instead of using a resistive load and see if it changes anything. As for the first circuit, it's also from a commercial product, an amplifier that's supposed to be very reliable. But I'm wondering if someone messed up the schematic.