[sdiy] Chip Tempcos was RE: Solder paste and toaster ovens

[Harry Bissell Jr]

> Here's the thing - I've got a mold that can be used
> to pot the whole mess.
> The expo converter is on it's own little 1 x 1 inch
> boardlette.  Two
> potential problems arise:  ah...is that a 12 volt
> expo converter or a 15
> volt?...hmmm coulda sworn I marked them.

well shame on you !!!    (no more fatties in the
parking lot at lunchtime, ok ?)   :^P

  second
> problem is the weight of
> the boardlette once the epoxy is glopped on.  it
> inserts into the main board
> with a socket.  it's fine on it's own, but add some
> weight and given that
> it's mounted vertically, I'm afraid that gigging may
> jostle these out.  I
> could solder them I guess - but they're so COOL as
> removable modules
> (kidding).

A hole at each end of the socket... and a ty-rap
around the finished assembly.

I do this with (guess what ?)  NAIS DS-2Y relays  :^P


> I'm thinking that possibly the only thing I'll have
> to pot is the space
> between the base of the tranny and the chip
> resistor.  Thing is, these VCOs
> are real real stable.  the tranny pair I' using
> makes sure of this.  In
> 'normal' room conditions you'll be able to set your
> clock by them.  I
> recently ran four of them at rom temp (a room full
> of drafts, that has a
> heater running at night and the door open to the
> outside during the day) for
> three days at 1k hz.  They were still tuned in
> unison 72 hours later   On
> stage though with temp going all willy nilly - this
> may be another story.
> But no one's complained about drift  yet - and they
> shouldn't ought'a -
> again - the LS318.

Hmmm that won't work for 15 minutes here in
Michigan...
maybe you need a beta-test site :^P

H^) harry