> The two N transistors of the bridge may be replaced with a 75477 > (0.1USD/1000pcs) I've guess there is replacement for P either but > requires some search. Alas it doesn't offer enough advantage over bare transistors and has some disadvantages. eg quiescent supply current is not nice. Current rating is no better than eg BC337 (my workhorse TO92 transistors) or eg 2N2222A. The logic inputs would be useful in some applications but not this one. Power dissipation is surprisingly low but OK. Saturation is OKish. RM -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist