Steve Taylor,

150 Watts, that sounds about what I need. Yesterday, I managed to get several watts threw three transistors in parellel.

Does, this 150 Watt transistor have curves like 500 mW transistors? I can't envision what kind of voltage would be appearing on the collector if it has so much power going threw it. I usually opperate with 1k to 10 k ohms between the collector and voltage supply. Well, it turns out that I had my emmiter and collector mixed up. Seems like it caused a lot of problems.

Andy Neil,

Could look at the data sheets, but I would have to find them some where on the internet. I have explored my transistor charicteristics outside the region that I normally use them in. Seems like it can handle a watt. What really is surprised me was that with 12volts, 100 ohms, the transistor in parellel and the transistor fully on. The transistor does not get hot.

Petter Dannagger,

I was not fully aware that there were 10 Watt or 150 Watt transistor. I soppose they could be cheap, if the desighn is based based more on sinking
energy, rather than a big NPN crystal.

I've got a little fan, would that help? I don't know the flow of energy out of the package might be to slow.