Has any one tried adding a 2n2222a transistor after the output transistor going to the motor. If so you should be able get all the raw power to the motor you need (at least up to 600ma). Of course adding some regulation may be nessary and getting the reverse to work with it may be tricky. Where can i find a shematic for one of these guys. I bought 2 this morning and look forward to making these bad boys screeeeem?