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Sebo
Joined: Apr 27, 2007
Posts: 564
Location: Argentina
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 Posted: Tue Nov 13, 2007 7:07 am Post subject:
Styroflex (polyestireno) VS Silver Mica Caps for Yusynth VCO
Subject description: Temperature Coefficient Differences |
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Hi:
I'm collecting parte to build some Yusynth VCOs. Yves told me that I
should use Styroflex or Silver Mica Caps with a Temp Coeff less than 70 ppm/C.
I have the choice to buy Styroflex 1% with a Temp coeff ±:+110ppm/°C, -50ppm/°C,
and Silver Mica 1% with a Temp coeff ±:+70ppm/°C, -0ppm/°C.
Silver mica are a little more expensive, but seems to be better, but
most of the time I ses VCO designs that uses Styroflex (Polyestirene) caps.
What is better?
Thanks.
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yusynth
Joined: Nov 24, 2005
Posts: 1314
Location: France
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| Posted: Tue Nov 13, 2007 7:22 am Post subject:
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Hi Sebo
Styroflex 1% are OK, no problem, in my case I chose Silver Mica 1% because it was easier for me to source them.
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Sebo
Joined: Apr 27, 2007
Posts: 564
Location: Argentina
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| Posted: Tue Nov 13, 2007 2:42 pm Post subject:
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Hi Yves:
Thanks a lot for the help.
I'm going to build 4 VCOs, but I'm going slowly (little time/small budget).
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a.b.o.z.
Joined: Feb 07, 2007
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| Posted: Mon Jul 21, 2008 3:38 am Post subject:
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| Where in europ I can find styroflex caps? |
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yusynth
Joined: Nov 24, 2005
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Sebo
Joined: Apr 27, 2007
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| Posted: Mon Jul 21, 2008 7:44 am Post subject:
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I bought mine at Farnell.
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a.b.o.z.
Joined: Feb 07, 2007
Posts: 351
Location: Zagreb, Croatia
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| Posted: Mon Jul 21, 2008 9:54 am Post subject:
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thnx guys.
So in place of styroflex I can use silver mica any time?
I'm looking at Buchla 281 and TH VCO 1 for next builds..looking for parts  |
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scriptstyle
Joined: Jan 22, 2008
Posts: 250
Location: nj
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| Posted: Mon Jul 21, 2008 10:59 am Post subject:
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| i just ordered some Polyestirene caps from futrlec.com for my vco-1 project i think they ship from thailand but i honestly dont remeber. |
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etaoin
Joined: Jun 30, 2005
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etaoin
Joined: Jun 30, 2005
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Location: Utrecht, NL
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| Posted: Mon Jul 21, 2008 12:43 pm Post subject:
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| scriptstyle wrote: | | i just ordered some Polyestirene caps from futrlec.com for my vco-1 project i think they ship from thailand but i honestly dont remeber. |
Yes, they ship from Bangkok.
But where on their site did you actually find polystyrene caps? They only list polyester.
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a.b.o.z.
Joined: Feb 07, 2007
Posts: 351
Location: Zagreb, Croatia
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| Posted: Mon Jul 21, 2008 1:02 pm Post subject:
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Thnx I know banzai. But they have no values I need (47n) for CGS Utility LFO. Or I can use silver mica for those? Yeah? |
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crashlander42
Joined: Oct 21, 2006
Posts: 292
Location: Orlando, FL (US)
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| Posted: Mon Jul 21, 2008 4:49 pm Post subject:
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I used polystyrene caps in my Yusynth VCO and my VCO-1 and they are extremely stable. In fact my Yusynth VCO and VCO-1 are the most stable all the VCOs I've built so far.
I ordered mine from Mouser. I noticed that in the two pages of polystyrene caps they had in stock that none of them were ROHS. That may be part of the problem with obtaining them in Europe.
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etaoin
Joined: Jun 30, 2005
Posts: 761
Location: Utrecht, NL
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| Posted: Mon Jul 21, 2008 10:35 pm Post subject:
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| a.b.o.z. wrote: | | Thnx I know banzai. But they have no values I need (47n) for CGS Utility LFO. |
As far as I know polystyrene (styroflex) doesn't come larger than 10nF.
| Quote: | | Or I can use silver mica for those? Yeah? |
You can use almost anything in an LFO, especially when using large values. Are you going to tell the difference between a 1 second and 1.01 second cycle?
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etaoin
Joined: Jun 30, 2005
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Location: Utrecht, NL
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| Posted: Mon Jul 21, 2008 10:36 pm Post subject:
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| crashlander42 wrote: | | I noticed that in the two pages of polystyrene caps they had in stock that none of them were ROHS. |
That might also be because few are still in active production, most will probably be old stock.
| Quote: | | That may be part of the problem with obtaining them in Europe. |
The LRC boxed type polystyrene seem to be reasonably common. But there is still plenty of old Siemens styroflex about.
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a.b.o.z.
Joined: Feb 07, 2007
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| Posted: Tue Jul 22, 2008 12:41 am Post subject:
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| Etaoin wrote: | | Are you going to tell the difference between a 1 second and 1.01 second cycle? |
I suppose not :-/
But on Ken's pages I've seend picture of utility LFO and those caps looks like styroflex to me. Oh well. Thnx anyway.
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scriptstyle
Joined: Jan 22, 2008
Posts: 250
Location: nj
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| Posted: Tue Jul 22, 2008 6:54 am Post subject:
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| Etaoin wrote: | | scriptstyle wrote: | | i just ordered some Polyestirene caps from futrlec.com for my vco-1 project i think they ship from thailand but i honestly dont remeber. |
Yes, they ship from Bangkok.
But where on their site did you actually find polystyrene caps? They only list polyester. |
ooo shoot! i could have sworn they where polystirene  |
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frijitz
Joined: May 04, 2007
Posts: 1734
Location: NM USA
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Posted: Tue Jul 22, 2008 9:07 am Post subject:
Re: Styroflex (polyestireno) VS Silver Mica Caps for Yusynth
Subject description: Temperature Coefficient Differences |
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| Sebo wrote: | I have the choice to buy Styroflex 1% with a Temp coeff ±:+110ppm/°C, -50ppm/°C,
and Silver Mica 1% with a Temp coeff ±:+70ppm/°C, -0ppm/°C.
Silver mica are a little more expensive, but seems to be better, but
most of the time I ses VCO designs that uses Styroflex (Polyestirene) caps.
What is better? |
Mica is not the best material for VCO caps because of its relative large soakage effect.
http://www.national.com/rap/Application/0,1570,28,00.html
Ian |
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Sebo
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scriptstyle
Joined: Jan 22, 2008
Posts: 250
Location: nj
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| Posted: Tue Jul 22, 2008 5:05 pm Post subject:
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| wow finding .001 polystyrene caps is turning into a nightmare. Mouser has them in there catlog so i put a couple of things together to get and that wasn't the only thing they didnt have. Does anyone know of a place that ships to the US? |
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Rykhaard
Joined: Sep 02, 2007
Posts: 1290
Location: Canada
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| Posted: Tue Jul 22, 2008 9:26 pm Post subject:
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| scriptstyle wrote: | | wow finding .001 polystyrene caps is turning into a nightmare. Mouser has them in there catlog so i put a couple of things together to get and that wasn't the only thing they didnt have. Does anyone know of a place that ships to the US? |
I'll check my stock of Poly caps tomorrow (later today, after I wake up) as I recently took in a whole pile of write-off stuff from work, including a few thousand poly caps of various values. (150nF; 2.2nF; 15nF and possibly a couple of others).
I'll see if I can find out what poly types they are. If they're polystyrene 1nF's, I can mail you down a few for nothin'. |
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crashlander42
Joined: Oct 21, 2006
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etaoin
Joined: Jun 30, 2005
Posts: 761
Location: Utrecht, NL
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| Posted: Tue Jul 22, 2008 11:42 pm Post subject:
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| scriptstyle wrote: | | wow finding .001 polystyrene caps is turning into a nightmare. Mouser has them in there catlog so i put a couple of things together to get and that wasn't the only thing they didnt have. Does anyone know of a place that ships to the US? |
I got 25 from West Florida Components on eBay at one point. They don't seem to have any listed currently, but might still have some. They ship for almost nothing to EU, so probably even cheaper inside the US.
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scriptstyle
Joined: Jan 22, 2008
Posts: 250
Location: nj
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| Posted: Wed Jul 23, 2008 9:19 am Post subject:
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| Rykhaard wrote: | | scriptstyle wrote: | | wow finding .001 polystyrene caps is turning into a nightmare. Mouser has them in there catlog so i put a couple of things together to get and that wasn't the only thing they didnt have. Does anyone know of a place that ships to the US? |
I'll check my stock of Poly caps tomorrow (later today, after I wake up) as I recently took in a whole pile of write-off stuff from work, including a few thousand poly caps of various values. (150nF; 2.2nF; 15nF and possibly a couple of others).
I'll see if I can find out what poly types they are. If they're polystyrene 1nF's, I can mail you down a few for nothin'. |
your a life saver im going to keep my fingers crossed in hope.. |
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Rykhaard
Joined: Sep 02, 2007
Posts: 1290
Location: Canada
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| Posted: Wed Jul 23, 2008 9:35 am Post subject:
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| scriptstyle wrote: | | Rykhaard wrote: |
I'll check my stock of Poly caps tomorrow (later today, after I wake up) as I recently took in a whole pile of write-off stuff from work, including a few thousand poly caps of various values. (150nF; 2.2nF; 15nF and possibly a couple of others).
I'll see if I can find out what poly types they are. If they're polystyrene 1nF's, I can mail you down a few for nothin'. |
your a life saver im going to keep my fingers crossed in hope.. |
Doh!  All of my poly caps that I have many many of, are MMK types - Metalized Polyester Film.
Now - I don't know how the different poly types stack up compared to each other.  I used to have a link to a capacitor site explaining them all but that was before my hard drive crash. Anyone??
_IF_ this type would be ok, I have only about 5-10 of the 1nF's that I could spare. 1.5nF - I have just over 2000, still on tape reel. |
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etaoin
Joined: Jun 30, 2005
Posts: 761
Location: Utrecht, NL
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| Posted: Wed Jul 23, 2008 9:57 am Post subject:
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Polypropylene would be an alternative, but polyester usually isn't.
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