Mylar cap??

[Henry Kolesnik]

I was at a hamfest looking for some mylar caps for a circuit that called for
them. I got several opinions on how to tell one and finally gave up. Are
there any sure fire ways to identiy a cap as mylar and why are they bettter
than a silver mica or others. Does anyone have a short chart comparing the
characteristics? How did we get by before mylar was used?
tnx
hank wd5jfr

 

[Charles Schuler]

"Henry Kolesnik" <wd5jfr@oklahoma.net> wrote in message
news:vhlp05tp88287d@corp.supernews.com...

I was at a hamfest looking for some mylar caps for a circuit that called
for
them. I got several opinions on how to tell one and finally gave up. Are
there any sure fire ways to identiy a cap as mylar and why are they
bettter
than a silver mica or others. Does anyone have a short chart comparing
the
characteristics? How did we get by before mylar was used?

Many mylars look like Chiclets. They are good capacitors ... typically more
temperature stable than ceramics. They are good for things like timing
circuits, active filters, etc. Silver micas are sometimes better for RF
oscillators when used as part of the tank circuit.

There is no absolute way to tell by just looking unless you have lots of
experience and keep with the new stuff.