Silver Mica de-coupling caps - Page 2

theChris · 16th August 2003, 05:38 AM

aren't silver-mica capacitors usually physically identifiable? i mean i've seen a lot that look well, identifiable!

and isn't silver-mica microphonic?

also, i think the 100nf caps are supposed to be located as physically close to the power IC (or opamp in case of pre-amp filtering) as possible. pretty sure caps with good high-frequency preformance are reccomended for this type of supply fitlering.

hacknet · 16th August 2003, 09:23 AM

if thats the case...i`ll probably go with the naked cap...

good choice?

ThorstenL · 16th August 2003, 11:13 AM

Konnichiwa,

Quote:

Originally posted by theChris
aren't silver-mica capacitors usually physically identifiable? i mean i've seen a lot that look well, identifiable!

I'd say so.

Quote:

Originally posted by theChris
and isn't silver-mica microphonic?

Actually much less than most other capacitors.

Sayonara

hacknet · 16th August 2003, 02:22 PM

just a silly question.

i have a spare 100k log pot lying around. can i use it or has it have to be a linear taper one?

is there any significance the the nature of the application?

ThorstenL · 16th August 2003, 02:29 PM

Konnichiwa,

Quote:

Originally posted by hacknet

i have a spare 100k log pot lying around. can i use it or has it have to be a linear taper one?

You CAN use a log pot, but you will have failry little usable volume control range.

Quote:

Originally posted by hacknet

is there any significance the the nature of the application?

You mean apart form the simple observation that linear track pots invariably sound better than their log counterparts and the usable volume control range? Apart from these, no.

Sayonara

hacknet · 16th August 2003, 02:44 PM

thanks Kuei Yang Wang....

i will be proceeding with the IGC ... should start work on the 1st week of september.... now i`m shopping around for parts

Thanks again!

hacknet · 16th August 2003, 03:00 PM

sorry, one more question...

Quote:

Originally posted by Kuei Yang Wang

Input resistor 15k, 18k from input to ground (across the RCA).

is the input resistor refering to the 10k in series with the 2.2uF cap or the pot?

what should the ideal value of the pot be?

sorry for this silly question....

ThorstenL · 16th August 2003, 03:05 PM

Konnichiwa,

Quote:

Originally posted by hacknet

is the input resistor refering to the 10k in series with the 2.2uF cap or the pot?

Yes.

Quote:

Originally posted by hacknet

what should the ideal value of the pot be?

No pot. The 18k+15k arrangement is for use as Power Amplifier (without Volume control). As integrated Amp (with Volume Control) use a 100k linear law Pot and a 10k Input resistor as directed.

Sayonara

Tor M · 16th August 2003, 06:01 PM

Quote:

Originally posted by Kuei Yang Wang
Preferred Pot types are Cermet from Vishay/Sfernice or ANY Carbon track ones, but preferably old hotmolded AB, Copal etc. - choose to taste, Cermet "precise" and "clean" and "neutral" while Carbon "musical" and "warm" and "romantic" (read a little fuzzy in a nice way).

Hi!
Are theese something like the Vishay pots you are recommending?

http://international1.farnell.com/Se...rm_inone.jhtml

Thanks.

Tor Martin

ThorstenL · 16th August 2003, 07:53 PM

Konnichiwa,

Quote:

Originally posted by Tor M

Are theese something like the Vishay pots you are recommending?

No Idea, the URL does not bring up a product....

Sayonara

16th August 2003, 05:38 AM	#11
theChris diyAudio Member Join Date: Dec 2001 Location: SIUE, Illinois, USA	aren't silver-mica capacitors usually physically identifiable? i mean i've seen a lot that look well, identifiable! and isn't silver-mica microphonic? also, i think the 100nf caps are supposed to be located as physically close to the power IC (or opamp in case of pre-amp filtering) as possible. pretty sure caps with good high-frequency preformance are reccomended for this type of supply fitlering. __________________ if only it could be used for good, not evil...

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16th August 2003, 09:23 AM	#12
hacknet diyAudio Member Join Date: Nov 2002 Location: sg	if thats the case...i`ll probably go with the naked cap... good choice?

16th August 2003, 02:22 PM	#14
hacknet diyAudio Member Join Date: Nov 2002 Location: sg	just a silly question. i have a spare 100k log pot lying around. can i use it or has it have to be a linear taper one? is there any significance the the nature of the application?

16th August 2003, 02:44 PM	#16
hacknet diyAudio Member Join Date: Nov 2002 Location: sg	thanks Kuei Yang Wang.... i will be proceeding with the IGC ... should start work on the 1st week of september.... now i`m shopping around for parts Thanks again!