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Posted: **Thu May 20, 2010 10:11 pm**

long283 wrote:The way you will be using the transistor is more like a switch. You simply want it to turn on or off, like a digital circuit. I believe you should go for maximium gain to keep the gate saturated, as long as the voltage divider keeps the gate below its maximum voltage.

Someone please correct me if I'm wrong.

Yes that's what I need to do from what i've read. So in that case should I be using 300 as the Hfe?

Posted: **Fri May 21, 2010 3:59 am**

I'd use a 2k2 resistor in the base circuit if you are switching the base with 12V. If you are using 5V I'd use about 1k. Remember too that the gain will drop as the collector current increases (see the datasheet).

www.MSgroups.com read only forum (Jan.15,2018)

Electronics question

Re: Electronics question

Re: Electronics question