[sdiy] SMD Tempco Plea for Help

[Tim Parkhurst]

Here's what I was thinking of trying - sandwich the tempco in between two
TO-92 case transistors. Just put the trannies face to face (the flat sides
together) with the resistor in between. You'll want to solder some wires to
the tempco first. Then, put a piece of heat shrink tubing over the
trans/tempco sandwich (maybe put some epoxy in on top of the transistors to
hold everything in place and provide strain relief for the wires coming off
the resistor), shrink the tubing so you get a nice tight fit and viola! The
heat shrink holds everything nice and tightly together AND keeps ambient
drafts off the tempco. 

Any thoughts?

Tim (bought a few of those SMT tempcos too) Servo

**********************************

> -----Original Message-----
> From: metamatic at webtv.net [mailto:metamatic at webtv.net]
> Sent: Monday, April 12, 2004 2:19 PM
> To: synth-diy at dropmix.xs4all.nl
> 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
> 
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