i need a cap on the circuit board in the picture, it is the silver axial in front of the orange drop. i am told it is made of a squishy rubber or plastic or sumthing as opposed to polypropelene or a harder plastic, im not very sure how true that is though. i am also told that they are very high quality and very expensive and are only found in high end audio equipment. it is a multisection 0.01µFx2 not sure about the voltage.it looks like a regular rolled up poly and metal film cap. i would be happy with a single section cap or any info on this at all. anyone know anything or ever seen this cap.
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Ahahahah... he didn't mean that! He wanted to say that this cap looks like the standard ones you can get anywhere... so vulgar meaning very popular. well you see... i agree with you giaime, but my boss, the one who posed this question to me ,thinks its some special, cool rare cap, but i keep arguing with him that it is some sort of rolled up film and foil cap and to just use a high quality equivelent like an auracap or solen's fast caps. i bet you wouldnt even notice the difference since it is for a guitar wah pedal going into a guitar amp, so i dont think there is any reason to be anal about that one cap, especially for a guitar.
Tube_Dude said:
Yes, but for critical oscillators/radio things, for audio I remember that someone tried many types of plastic capacitors and posted the graphs. Polystyrene had a very bad attitude, maybe it introduces some non-linearities that make a wah sound good... I don't think so.
Prepare a blind test for your boss: use 2 indentical wahs, one with a cheap cap and one with a polystyrene cap. I bet he will prefer the cheap cap...
The silvery one is a regular type Styroflex, or Polystyrene as Carlos mentioned, generally called Silver Mica on this site.
Siemens made lower cost versions like the one you posted, the B31861 series.
The absolute best up till today are the Orange Siemens B31531 series, Rifa made the excellent PHE 425 Styroflex.
Styroflex's go up till around 56 nF.
I used the B31531 for RIAA networks, cost around $3.50 the piece.
A general Siemens 0.01 uF styroflex version measures about 1/3" x 2/3".
Siemens made lower cost versions like the one you posted, the B31861 series.
The absolute best up till today are the Orange Siemens B31531 series, Rifa made the excellent PHE 425 Styroflex.
Styroflex's go up till around 56 nF.
I used the B31531 for RIAA networks, cost around $3.50 the piece.
A general Siemens 0.01 uF styroflex version measures about 1/3" x 2/3".
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Thanks Jorge,
i figured they were the same, and it was a language thing.
In Germany styroflex caps are called glimmer capacitors, which generally is used for mica.
What was called a mica capacitor here, was used for radio purposes,glass audio, and military applications in the past.
Often variable trim caps, up till 20 nF, with 5% accuracy.
Styroflex can have a 1 % tolerance.
I had no idea they are still produced.
Can you name a few manufacturers and the sizerange of Silver Mica's ?
i figured they were the same, and it was a language thing.
In Germany styroflex caps are called glimmer capacitors, which generally is used for mica.
What was called a mica capacitor here, was used for radio purposes,glass audio, and military applications in the past.
Often variable trim caps, up till 20 nF, with 5% accuracy.
Styroflex can have a 1 % tolerance.
I had no idea they are still produced.
Can you name a few manufacturers and the sizerange of Silver Mica's ?
jacco vermeulen said:
Jacco
Open
http://www.cde.com/
and clic in Mica Capacitors in the left column .
BTW, polystyrene caps have neither 'bad attitude" nor significant nonlinearity. Their main drawback is temperature sensitivity- it doesn't take much heat to ruin them.
Silver mica is just the opposite- very nice to use when trapped in a hotbox tube amp.
The one thing they have in common is that they're easily available in small values and tight tolerances.
Silver mica is just the opposite- very nice to use when trapped in a hotbox tube amp.
The one thing they have in common is that they're easily available in small values and tight tolerances.
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