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Ok, so this thread is about a bridge driver and not a motor driver?
In the first post you asked if there is a problem using 2N3055 to drive a motor, did you mean as a pre-driver for the output stage?
If so what is the output stage and how much current will it need to supply to the motor?
Given that the Ic of the 2n3055s will be 2A, the minimum Hfe is 20, so Ib must be > 100mA. So the driver transistor must be able to deliver this current which is exactly the max current for a BC 549. If cash is really short, select yourself some 2n3055s with higher Hfes and use them in the darlington configuration. Watch out for the voltage rating of the BC 549s or connect its collector to a +5V line.
Frank
No problem whatsoever. Just that you'll have heat -dissipation issues, and you'll need proper drive circuits for fast switching. Quite a challenging job, but i say GO for it !!
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