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Polypropylene caps
Polypropylene caps
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Old 2nd January 2011, 04:15 PM   #1
ads2 is offline ads2  France
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Default Polypropylene caps

Hello,

I have bought these propylene caps for BrianGT LM3886 kit.
Polypropylene Capacitors CBB 63 V 104 0.1 UF 10pcs en vente sur eBay.fr (fin le 09-janv.-11 01:54:10 Paris)
I leave a very small village, so no way to buy them on a shop.
but all picture of the kit I see have bigger and rectangular caps, not like this one.. Am I missing something ?
Normally I need something similar to 0.1 uf BC polypropylene cap

Regards
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Old 2nd January 2011, 05:17 PM   #2
Minion is offline Minion  Canada
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Capacitors come in many different body types , Some are Box caps , some look like Chicklets like the ones you posted , some are tubular ect , as long and the Value of the cap and Voltage of the cap is correct then the cap should be suitable for your project , space permiting .....

Cheers
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Old 2nd January 2011, 06:11 PM   #3
ads2 is offline ads2  France
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Thanks Minion for your reply.
Any difference of sound quality even if both are suitable ?
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Old 2nd January 2011, 06:21 PM   #4
pacificblue is offline pacificblue  Germany
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The 0,1 F capacitors are decoupling caps for the power supply pins, Zobel caps for the output, and snubber caps for the power supply. They are small. The big rectangular caps you often see are probably the DC blocking caps that should be at the input, but are not usually part of the kit.
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Old 2nd January 2011, 06:33 PM   #5
ads2 is offline ads2  France
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I can confirm you that they are part of the kit...
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Old 2nd January 2011, 06:38 PM   #6
pacificblue is offline pacificblue  Germany
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Well, they only appear big in the photo. They actually are small and have the functions I described in my former post. The ones you bought are comparable.
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Old 2nd January 2011, 06:41 PM   #7
Minion is offline Minion  Canada
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Quote:
Originally Posted by ads2 View Post
Thanks Minion for your reply.
Any difference of sound quality even if both are suitable ?
Any sound quality differances , if any , will be subtle and possibly benificial ....
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Old 3rd January 2011, 11:24 AM   #8
AndrewT is offline AndrewT  Scotland
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Hi,
if adding the PP caps to the PSU cause ringing in the supply to the operating chipamp then, yes the PP will be audible.

If the ringing disappears when you remove the PP caps from the PSU then the extra caps will be inaudible.
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Old 3rd January 2011, 06:42 PM   #9
pacificblue is offline pacificblue  Germany
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With post #8 in mind I had a look at that CarlosFM PSU and asked myself why a 1 Ohm resistor in an RC circuit with a corner frequency of 1,6 MHz should need a 2 W rating. And why would a PSU need an RC circuit in the first place?

If you left the 100n caps out, would you still need the RC circuit?
If you used 100n ceramic caps right next to the recitifier (as is common practice) instead of film caps on the other side of the PCB (which bears the risk that trace inductance and caps form a resonant circuit), would you still need the RC circuit?
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