Heat Sinks

[gary350]

Lawn mower aluminum engine heads make excellent heat sinks $1 each at scrap metal yard costs much less than new heat sinks. All I need to do is drill and tap a screw hole. They even have several mounting holes. This IRFP460C mosfet will stay very cool. It beats paying crazy prices for electronic heat sinks.

 

[schmitt trigger]

Excellent tip!
I bet this “heatsink” is good for a couple hundred watts with some airflow.
It could be used in a steampunk amplifier. You could even add a spark plug for decorative purposes.

 

[Tony Stewart]

I wonder how much surface roughness there is and how that impacts Rjc.

 

[schmitt trigger]

Good point Tony

 

[audioguru]

Thermal compound is not good enough to allow enough heat transfer with those deep scratches and dirt.

 

[crutschow]

Lawn mower aluminum engine heads make excellent heat sinks $1 each at scrap metal yard costs much less than new heat sinks.

As lone as the scrap yard is close enough so the cost of the gas to drive there and back is less than what you saved.