Brand new circuit that you will fin nowhere on the internet.. he he cos i found this out. Well runnig DC motors for a robot you can very happily use this low cost circuit that using a L293D for Rs175!! in this circuit i have put a H-Bridge circuit with u ULN 2003 Ic that costs just 12 bucks.
okie now i assume the circuit is very easy to understand.. A" and B" are the two control signals.. givin a high to any one of them wil make the motor move in one direction while a signal to the other will mover it in opposite direction.The main asvantage of this circuit being that you can adjust the voltage applied to the motor by cahgig the sypply at collector of the BC107.(sorry people for not puttin " >" at the emitter. assume it to be down!!) i almost got my recor torn by my techer for not putyting the arrow at the emitter in my secon semester of college!!!<>
Its all about !!!