ORIGINAL MESSAGE: (may be snipped)
On 2/15/2014 9:04 AM, Alan Ibbetson wrote:
I am planning on using TO-220 high voltage switching FETs which are
primarily targeted at SMPS use. The drain is connected to the mounting
tab. I did look into using a more conventional style of heatsink with
an Alumina plate as a thermally conductive but electrically insulating
interface between a copper heat spreader and the main heatsink, but
the US supplier let me down on delivery and in any case was wildly
expensive for overseas customers. This approach allows me to bolt the
FETs directly to two heatsinks (in a push-pull circuit) and float the
whole assemblies at drain voltage. I don't see this as being much
different from applying an external anode valve.
At the danger of stating the obvious, I do plan on enclosing
everything inside a case for safety!
73, Alan G3XAQ
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REPLY:
Sounds interesting, Alan. Please keep us posted on your progress.
73, Bill W6WRT
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