What voltage are you feeding this with? I assume it is more than
24v in order for you to have a 24v position.
If you are running in the 10 volt position, for instance, that would be
drop of at least 24v - 10v = 14v. Fourteen volts at .5amp is 7W being
dropped into that transistor. That's a pretty fair amount of heat.
On Fri, 09 Mar 2018 06:17:16 -0800
"Walter" <W9KJO@ARRL.net> wrote:
On Wed, Feb 21, 2018 at 06:23 pm, LKNDAVE wrote:Based on this design I built this attached circuit.