Hi Steve,

Compare the resistance of a BG micro motor (about 50 ohms) with your
micro pager motor which has a winding resistance of 11 ohms. 74 HC240
outputs have an output resistance of about 40 ohms. That tells you
that with an initial 11 ohm load, there will be a significant voltage
drop on the 74HC240 motor driver outputs and starting torque will be
low. Still that pager motor is very efficient, the mechanical load is
small and once the motor rotates, the effective winding resistance
goes way up and the driver efficiency increases.

I saw no specs in the link you gave for the FLED. I checked some RS
FLEDs I have and the average current is about 2 ma. I designed a new
74HC240 LED flasher circuit which has an average current of about 100
uA. The LED flashes much brighter than the FLEDs. The circuit
provides some voltage boost so it works down to 1.5V. I have posted
the new SPSH3 circuit in the file section. The low power LED flasher
comes on when the SE triggers and stays on until the SE resets. The
rest of the SPSH layout has been changed somewhat to simplify
connections between IC pins. A layout drawing will follow soon. A
SPSH4 design is next that replaces the 1381 with two transistors and
provides dual motor drivers.

wilf

--- In beam@y..., "shenri" <shenri@y...> wrote:
> Yeah the motor runs just fine with only one inverter. I thought
> about using the extra inverters to make my own fled circuit but I
> don't know how at this time. My brain has to forget a lot of other
> stuff before it can absorb anymore of this circuit stuff. :-)
Right
> now it's full of other important stuff relating to my career in
> Oracle DBMS and Networking.
>
> Anyway, I'm using 1 diode in series with a 1381J. I don't know how
> efficient this motor is. Can you tell me?
> http://sales.goldmine-elec.com/prodinfo.asp?prodid=4089
>
> It is hooked up to the last gear on a salvaged oven-timer-unit gear
> set. I lined up the motor with the gear shaft and put a little
> silicone caulk between the two shafts to connect them togther.
What
> about the FLED I am using, is it a power hog or what.
>
> Steve.
>