[sdiy] SMD Tempco Plea for Help

[Brice D. Hornback]

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
>