melcor cap choices

[Jonkan]

quick question:

Is it ok to use a "regular" ceramic cap in the C1 (680pf) position, or does it need to be COG or NPO?

/Jonas

 

[CJ]

reg is ok

 

[Jonkan]

ok, thanks!

Is there a noticable difference using cog, npo or perhaps even poly caps?

/Jonas

 

[CJ]

Try and see.
Let me know if you need parts.
cj

 

[Jonkan]

i can only find 680pf cog and npo caps at farnell, and i can only shop there through my dads company. And he prefers that i order something more than just 2 caps :wink: , so i have to wait until i start a new project and order some other parts aswell.

So a regular will have to do in the meantime i guess.
/Jonas

 

[clintrubber]

If you don't mind the looks you could also add two filmcaps in series, these start at say 1nF and up. I figure it does not necessarily call for a ceramic there, on the contrary. So a filmcap preferred it it can be one. I've also seen pics here of polystyrene.

 

[Jonkan]

Ok, i actually found a 680pf film cap at a store in sweden, gonna order it now.

Its an axial 630v polyester one +/-2.5%. Is that ok? It doesnt matter if the voltage is higher right?

/Jonas

 

[louder]

alo
won`t that cap be a litlle to big?
best regards
pedro

 

[Jonkan]

10*5mm... it'll fit if i bend the legs I think.
/Jonas