"The thing that worries me is that raul seems to not even have been
taught the difference between TO-92 and TO-220."
Your right Rich, I don't know the difference.
Anyway, here is the bread board of Ed's schematic but, the motor runs
continuously so obviously I've done it wrong. Does anyone have any
ideas?
http://www.2minclip.biz/controller/
Thanks, Raul
A TO-92 is one of those small, three pin plastic packages that you see
used with signal transistors. The transistor you have is a TO-220.
Also, how is this supposed to shut off? It looks like you can vary the
duty cycle, and thus slow down or speed up the motor, but shutting it off
requires you to permanently pull the base of the TIP31C to ground somehow.
You can add another switch that will turn it off by toggling the reset pin
to ground (view with fixed point font)
5V-----o------
|
o Switch, open = off, closed = ON
\
o------ To Reset
|
[100k]
|
GND----o------
--
Regards,
Bob Monsen
" We can allow satellites, planets, suns, universe, nay whole systems
of universes, to be governed by laws, but the smallest insect, we wish
to be created at once by special act."
-- Charles Darwin