Hello again:
I have a Dremel 395 rotary tool with variable speed control.
After acting up almost from the very start, the said VSC finally went
south, with the contacts in the sliding switch severely damaging the
tracks, now useless.
Acting on common sense (remains to be seen), I decided that the best
thing would be to wire it straight and then see about a different /
external speed control instead of spending money on a new one.
The original never worked properly and IMHO is flimsy, to say the
least.
The unit now works perfectly well but only at full speed and many
times I need to reduce it to more manageable RPMs ie: 75%, 50%, 30% of
the 33K RPM full speed.
Before getting something else, I'd like to see about taking advantage
of the ceramic board and the components as the only parts that are
damaged are the tracks.
Here's a photo of one of those ceramic VSC boards, posted by someone
with a different problem at imageshack which shows the tracks in
perfect shape. (Thanks!)
http://img135.imageshack.us/img135/6369/vsc2gg8.jpg
The sliding switch has three contacts which form part of the same
piece of brass: the first contact slides on the dark track, the second
contact slides on the silver track and the third contact slides on a
brass track in contact to one of the graphite brushes.
Far left = min. speed
Far right = max speed
The other brush connects to the solder contact seen at the right of
the surface mount capacitor.
In order to be able to use this same VSC board, what would I have to
use to replace the function of the tracks?
A potentiometer between the solder contact seen at the right of the
surface mount and the ground tab on the (?) voltage regulator?
Thanks in advance,
CIV
