[ATM] Equatorial mount motors

[p.pissias at di.uoa.gr (Peter Pissias)]

Hi,
I've made a control circuit for small unipolar stepper motors
and it works fine so far. I control the motors from
my computer (parallel port) and the circuit is based on the ULN2003
darlington array.
My circuit is based on :
http://www.doc.ic.ac.uk/~ih/doc/stepper/control2/connect.html


Now, in order so control my equatorial mount,
i have ordered 2 motors (astrosyn) which have 0.6Amps on their
specifications.


I was wondering if my existing circuit will do the job
since the ULN2003 darlington transistors have 500mA as a maximum on DC
operation
and 600mA as a peak value.


Will the cicruit work? or i have to get a new, higher current, darlington
array chip?


Ps: I was looking for higher current darlington arrays to replace
the ones i have now on the board and i couldn't find anything (18pins, same
operation). A close match is the UDN2540b darlington array chip but i
will have to redesign the circuit...
I would appreciate any suggestions!


Thanks!


Peter Pissias