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Old 6th January 2006, 05:37 AM   #1
philb is offline philb  Canada
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Question Quality capacitors without breaking the bank

I am building Rod Elliot's constant Q expandable graphic equaliser. http://www.sound.westhost.com/project75.htm .

I have been reading and re-reading his article for a few weeks putting together everything i can find. I have come to choosing components, and have run into a snag. I would like to use foil polyprop caps, but since the circuit requires so many caps i will be broke. Also 1% metal film capacitors are not cheap.

I was looking at digikey BC components metalized POLYESTER film caps, and yageo 1% metal film resistors.

Are these good choices, or are is there a better bang for my buck? Thanks guys.
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Old 6th January 2006, 05:46 AM   #2
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both r good.
i made his 12db xover with philips m/f caps.its working great.
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Old 7th January 2006, 04:06 AM   #3
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Quote:
digikey BC components metalized POLYESTER film caps
Can you give me a page number in their online catalog for these?
I did a search and see only polypropylene listed for BC components. Even so... I couldn't find any metalized versions.

I used Polypropylene Film from EPCOS @ 5% tolerance in my last EQ project. They work good.
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Old 7th January 2006, 09:06 AM   #4
jpl is offline jpl  Australia
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Try E-bay very cheap .
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Old 8th January 2006, 09:06 PM   #5
philb is offline philb  Canada
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head_spaz

the BC components caps were metalized POLYESTER film caps, not polyprops. Thanks for the heads up on epcos polyprop caps, but i think for a few bucks extra i will go with the tighter toleracne of the BC componenets metallized POLYPROP filter caps, unless there is a reason i should not.

I will aslo check e-bay but i don't think i will find all the value.

Thanks fot the help, i'll post pics when i start building.
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Old 1st June 2014, 04:18 AM   #6
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Hi PhilB,

Thinking that a graphic equilizer might be similar to a speaker crossover
you might want to use film and foils rather than metalized film.

RNMarsh discussed this around here in a few of his posts. I think it
has to do with resonances, distortion because the metal particles
are applied to the film in metal films while in film foil they are
separate layers and produce less distortion.

More expensive and larger, but probably worth it.
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Old 1st June 2014, 07:11 PM   #7
DF96 is offline DF96  England
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Graphic equalisers typically handle smaller signals than speaker passive crossover networks, so distortion is less of an issue. Dielectric linearity is the thing to look at, which may suggest polyester is not the first choice.
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Old 1st June 2014, 08:00 PM   #8
AndrewT is offline AndrewT  Scotland
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1% metal film resistors are standard stock for most retailers.
I buy mine from Rapid online @ ~ 1.60+vat per 100.
That's less the 2p each.
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