DIY DIP heatsinks?

[dentaku]

I have a clone Adafruit Motor Shield V.1 with two L293D drivers on it. http://arduino-info.wikispaces.com/file/view/DK-MotorShield-300.jpg/419382206/DK-MotorShield-300.jpg
I was testing out various little bipolar stepper motors I salvaged from scanners, fax machines etc. and the L293D eventually gets very hot.
Is there a good DIY way of heatsinking 16 pin DIPs like this? I don't have any adhesive thermal paste or pads.
I've got a bunch of tiny heatsinks I can cut down to the right length easily.

[fivefish]

You can stick chipset heatsinks on top.
http://www.ebay.com/itm/20x-Mini-Aluminium-MOS-IC-Chipset-Cooler-Cooling-Adhesive-Back-Heatsink-/321388575314?hash=item4ad4407a52:g:ZT4AAOSweW5VdrLg

[krivx]

You can use any thermally conductive material, just make sure to measure temperatures and don't assume you will get results that are as repeatable as with commercial heatsinks.
Here are some homespun examples:
http://tangentsoft.net/elec/diy-hs.html

[dom0]

Or you could use a modern current mode stepper motor controller that is much more efficient than the 1940s L293. Seriously, 3 V drop at 1 A load current is fucken hilarious today. Even fifteen years ago actually.

[dentaku]

Or you could use a modern current mode stepper motor controller that is much more efficient than the 1940s L293. Seriously, 3 V drop at 1 A load current is fucken hilarious today. Even fifteen years ago actually.

It was cheap and I wanted to try it.

I also have some A3967 based EasyDrivers that are tiny and don't get nearly as hot.

[dentaku]

You can stick chipset heatsinks on top.
http://www.ebay.com/itm/20x-Mini-Aluminium-MOS-IC-Chipset-Cooler-Cooling-Adhesive-Back-Heatsink-/321388575314?hash=item4ad4407a52:g:ZT4AAOSweW5VdrLg

Yup, That's what I was thinking about. Most motherboards has tiny heatsinks stuck to the bigger ICs.

[fivefish]

I've used this one too.


http://www.mouser.com/ProductDetail/Aavid-Thermalloy/501200B00000G/?qs=VJtzl2NKxc3RD4IPRgm%2FVg%3D%3D&gclid=CNPF4dy8-cgCFRc6gQodS7sPmw

[dentaku]

Just for fun I decided to sand down a rather large heatsink with very fine sandpaper until it was perfectly flat, added some Artic Silver and attached it to the chip by stringing a piece of wire under the DIP socket and over the top of the heatsink.

Here's a photo of it before I managed to tighten it correctly. It seems to work quite well. If you tighten it until the outer heatsink fins start bending a bit you can let go and the springiness of the fins keeps everything tight.

[JoeB83]

It looks like that solution would work pretty well as long as there's thermal grease between the sink and the case and it's attached firmly. Another solution, one I've used in the past, was finding clip-on heatsinks designed for TO-220 and narrowing the clip so it fits between the IC pins.

[dentaku]

It looks like that solution would work pretty well as long as there's thermal grease between the sink and the case and it's attached firmly. Another solution, one I've used in the past, was finding clip-on heatsinks designed for TO-220 and narrowing the clip so it fits between the IC pins.

Hmmm
I might have one of those.