Home |
Search |
Today's Posts |
|
Electronics Repair (sci.electronics.repair) Discussion of repairing electronic equipment. Topics include requests for assistance, where to obtain servicing information and parts, techniques for diagnosis and repair, and annecdotes about success, failures and problems. |
Reply |
|
LinkBack | Thread Tools | Display Modes |
#1
|
|||
|
|||
mica capacitor substitutes
I simply can't buy silvered mica caps in south africa. They cost more
than the output transistors. I need them for an amplifier project. What do I do? |
#2
|
|||
|
|||
mica capacitor substitutes
Hi Johan,
Can't you use polyester or other film type caps? Or maybe if you need a lot of them order internationally from Digikey or one of those places? When I lived in Europe I sometimes had stuff shipped from the US and it wasn't a big deal unless you want fast airmail service, but even then it was ok for smaller parts. For small qties my solution was very often to scavenge them out of an old radio or TV. One that was at least 20 years old because the new ones only have ceramics and electrolytics. Regards, Joerg http://www.analogconsultants.com |
#3
|
|||
|
|||
mica capacitor substitutes
On Tue, 04 May 2004 20:19:33 GMT, Joerg
wrote: Hi Johan, Can't you use polyester or other film type caps? Or maybe if you need a lot of them order internationally from Digikey or one of those places? When I lived in Europe I sometimes had stuff shipped from the US and it wasn't a big deal unless you want fast airmail service, but even then it was ok for smaller parts. For small qties my solution was very often to scavenge them out of an old radio or TV. One that was at least 20 years old because the new ones only have ceramics and electrolytics. Anyone know why it is that mica and polystyrene types are becoming so hard to find? Is there a shortage of mica and polystyrene?? -- The BBC: licenced at public expense to spread lies. |
#4
|
|||
|
|||
mica capacitor substitutes
In article ,
Johan Wagener wrote: I simply can't buy silvered mica caps in south africa. They cost more than the output transistors. I need them for an amplifier project. What do I do? Move? Use NPO ceramic? -- -- forging knowledge |
#5
|
|||
|
|||
mica capacitor substitutes
On Tue, 04 May 2004 23:52:19 +0100, Paul Burridge
wrote: On Tue, 04 May 2004 20:19:33 GMT, Joerg wrote: Hi Johan, Can't you use polyester or other film type caps? Or maybe if you need a lot of them order internationally from Digikey or one of those places? When I lived in Europe I sometimes had stuff shipped from the US and it wasn't a big deal unless you want fast airmail service, but even then it was ok for smaller parts. For small qties my solution was very often to scavenge them out of an old radio or TV. One that was at least 20 years old because the new ones only have ceramics and electrolytics. Anyone know why it is that mica and polystyrene types are becoming so hard to find? Is there a shortage of mica and polystyrene?? Somebody in Japan, I think, quit making the polystyrene film. There's still lots of mica in the ground, but these caps are labor-intensive to fabricate, and NPO ceramics work as well (better, maybe: mica has nasty dielectric absorption.) I think some big transmitting caps may still be mica. Mica is still used to insulate the heater elements in toasters, last time I looked. Somebody does make surface-mount mica caps, I think! John |
#6
|
|||
|
|||
mica capacitor substitutes
Hi Paul,
Besides Japan there had also been a rumor or maybe even story in the press that Bayer might discontinue some type of film. But there are alternatives. Regards, Joerg http://www.analogconsultants.com |
#7
|
|||
|
|||
mica capacitor substitutes
Hi Paul,
This is an older article but it seems the folks from Bayer and others are instilling some hope he http://www.manufacturing.net/pur/article/CA139284 Regards, Joerg http://www.analogconsultants.com |
#8
|
|||
|
|||
mica capacitor substitutes
|
#9
|
|||
|
|||
mica capacitor substitutes
In article ,
Paul Burridge wrote: On Tue, 04 May 2004 20:19:33 GMT, Joerg wrote: Hi Johan, Can't you use polyester or other film type caps? Or maybe if you need a lot of them order internationally from Digikey or one of those places? When I lived in Europe I sometimes had stuff shipped from the US and it wasn't a big deal unless you want fast airmail service, but even then it was ok for smaller parts. For small qties my solution was very often to scavenge them out of an old radio or TV. One that was at least 20 years old because the new ones only have ceramics and electrolytics. Anyone know why it is that mica and polystyrene types are becoming so hard to find? Is there a shortage of mica and polystyrene?? The low melting temperature has a lot to do with polystyrene's demise. Too bad, they have some nice properties. Can't put those through the machines, though -- have to be hand-soldered. Mica, which pricy, is still available from places like DigiKey. -frank -- |
Reply |
Thread Tools | Search this Thread |
Display Modes | |
|
|