[sdiy] Silvered mica caps in VCO core integrators

[rsdio at audiobanshee.com]

For these sorts of prototyping tasks, I use a layout technique called "multi site." I generally use SMD for C0G, but polystyrene is only available in through-hole. So, I lay out the PCB with SMD pads for the C0G and holes for the poly cap option.

In your case, I suppose both options are through-hole. In that case, you could get those milled pins that can be separated and soldered as single pins. I've used those where I want to replace through-hole parts that aren't DIP.

Brian


On Apr 14, 2016, at 7:47 PM, David G Dixon <dixon at mail.ubc.ca> wrote:
> I found the page in Bob Pease's book where he says that the dielectric
> absorption of silvered mica caps is unexpectedly bad.  I still don't know
> what (if anything) this is going to mean in a VCO circuit, especially a
> tricore (no sudden change in voltage on the cap).  If it is truly
> intolerable (like, it won't track, or the triangles look all wobbly), I'll
> suck it off and replace it with C0G (shoulda used sockets).  However,
> something tells me that it's going to work just fine.
>