Choosing the appropriate type of capacitor/resistor for audio amp. (TDA2822M)

Thread Starter

TheLaw

Joined Sep 2, 2010
228
Hi,

I am going to start a simple amp project. I am also in the market for a sound card for my computer. I was looking around and saw an Asus card that used Nichicon KZ Audio Capacitors.

So, seeing those made me wonder what made an "audio capacitor" different than a regular old electrolytic. Oh and the KZs are electrolytics.



So I was wondering what difference these capacitors have with a general purpose electrolytic and where in an amplifier would they be most suitable?

Here's the circuit I am working on:



So what does it all mean?

Thanks.
 
Last edited:

marshallf3

Joined Jul 26, 2010
2,358
Thy're all common components, C1 - 5 are electrolytics, 6 & 7 could be 50 or 100V film or ceramic disc caps. C1 & 2 could be about any voltage but C3 - 5 should be somewhere above the supply voltage in rating.

Common 1/4W resistors as well, 5% or better tolerance suggested.
 

Thread Starter

TheLaw

Joined Sep 2, 2010
228
Thy're all common components, C1 - 5 are electrolytics, 6 & 7 could be 50 or 100V film or ceramic disc caps. C1 & 2 could be about any voltage but C3 - 5 should be somewhere above the supply voltage in rating.

Common 1/4W resistors as well, 5% or better tolerance suggested.
Thanks! I just wasn't sure exactly where the film caps would go into play there.
 

Thread Starter

TheLaw

Joined Sep 2, 2010
228
If you need a high capacity in a small package, like for a power supply filter.
I still don't quite get it. If its an audio cap, shouldn't it be used where audio is physically present. Not necessarily a power supply cap? Or is that part of it?
 

marshallf3

Joined Jul 26, 2010
2,358
I still don't quite get it. If its an audio cap, shouldn't it be used where audio is physically present. Not necessarily a power supply cap? Or is that part of it?
Naw, it's just a high quality (and probably high$) capacitor. Typically this will mean a tighter value tolerance and lower ESR. Something you might find in a $2,000 receiver but not driving a simple stereo IC such as you presented earlier.
 

Thread Starter

TheLaw

Joined Sep 2, 2010
228
Well the funny thing is, is that they are dirt cheap. Like $0.70 for a 470uf 50V cap, which is in theory cheap, compared to other Nichicon Caps which can be $1.00+ per cap sometimes.

Would it make sense to use one of these in a power supply?
 

marshallf3

Joined Jul 26, 2010
2,358
Well the funny thing is, is that they are dirt cheap. Like $0.70 for a 470uf 50V cap, which is in theory cheap, compared to other Nichicon Caps which can be $1.00+ per cap sometimes.

Would it make sense to use one of these in a power supply?
Must not be much special to them, more a marketing move than anything. Compare the spec sheets to see what, if anything is different then choose whichever you like the best.
 
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