[sdiy] VC Glide

[Jim Patchell]

jhaible at t-online.de wrote:

> patchell schrieb:
>

    I didn't know I schriebed.... :-)

>
> Wow, that's 2 to 3 orders of magnitude better than the
> guaranteed specs !
> If this wasn't just pure luck, I guess it's time to
> buy some 3280's, if they are generally so much better
> than spec'ed.
> Do you have "A" types (would still be way above specs)
> or the simple ones ?
>

    No, I am too cheap to purchase the 'A' version, which is over $5 in
100's.  Unfortunately, I soldered the part into the board.  Otherwise, I
would try several parts to see if I got the same result.  However, my
experience over the last 20 years with this part has been that I don't
need to trim the devices to get good CV rejection.  I remember the first
time I built something with one, a State Variable filter, I was totally
blown away by the fact that the was not feed thru.  And trimming the
OTA's in an SVF I always considered quite a pain, because the trims
would interact if you didn't do it correctly.

    I can fire up one of my older projects, probably not tonight (Model
Railroad meeting tonight), and see if I get the same results, although,
I think it uses a different circuit.

>
> JH.