[sdiy] SMD Tempco Plea for Help

[Roman]

I do that sometimes. I ordered PCB with 1206, 0805 and 0603 pads
connected to 300 and 400-mills spaced round pads (I'd make a photo
but it's so simple it's easier for me to describe it), and I cut it using
big scisors. I also do that with SOT23 and SOT323 If I remember
the name correctly. Now I can use e.g. dual transistor that comes only
in SMD on solderless breadboard. Yeah, I use that too :)

Roman

----- Original Message -----
From: "Brice D. Hornback" <bdh at cyberbound.net>
To: <metamatic at webtv.net>
Cc: <synth-diy at dropmix.xs4all.nl>
Sent: Tuesday, April 13, 2004 2:30 AM
Subject: Re: [sdiy] SMD Tempco Plea for Help


> I took a little slice (about 1/16" wide and 1/2" long) of PCB material and
> used a dremel to gently cut a bit of the copper to separate the two
halves.
> Then, I drilled little holes for leads using perfboard for a template to
get
> 0.4" spacing (like a standard resistor).  Tin both sides first then simple
> reflow the solder to attach the tempco.  After I did this... I had a small
> run of PCB's made.  These are VERY nice.  I've been considering doing a
> large batch of these little PCB's... but cutting them all apart is a very
> time consuming task.  If you have a "nibbling" tool and a piece of PCB
> material (single sided works best otherwise you have to "cut" both
sides)...
> it only takes about two minutes to build a leaded 1K (or put two in series
> for 2K) 3300ppm tempcos.  I didn't have much success soldering leads
> directly to the tempcos as they seemed to "fall apart" quite easily.  I
hope
> my tiny PCB idea helps.
>
> - Brice
> http://www.SynthModules.com
>
> ----- Original Message -----
> From: <metamatic at webtv.net>
> To: <synth-diy at dropmix.xs4all.nl>
> Sent: Monday, April 12, 2004 4:18 PM
> Subject: [sdiy] SMD Tempco Plea for Help
>
>
> > Hello everyone,
> >
> >  I ordered some of the Panasonic 805 surface mount tempco from Digi-Key,
> > and finally received them today. For just over $21, I bought 50 1K
> > 3300ppm tempcos. I had grand dreams of tempcoing every expo converter
> > I've ever built. Forget just VCOs, I'm tempcoing filters, VCAs,
> > everything!
> >
> > So I open the package, and...
> >
> >  Sweet merciful crap, these things are small!
> >
> >  I remember a couple of list members mentioning that they've used the
> > SMD tempcos, affixing them to 2SC1583s and what have you. What type of
> > adhesive would be best to stick them on the transistor pair?
> > Cyanoacrylate emits some nasty fumes when heated (I've learned this the
> > hard way), so I've just about ruled that out. I'm thinking I might use
> > wire-wrapping wire to solder to the terminals on the tempco... good
> > idea? Better suggestions?
> >
> >  Thanks for any suggestions!
> >
> > Richard Hess
> >
> > metamatic at webtv.net
> >
>