On 26/05/2011 13:46, Olin Lathrop wrote: > Oli Glaser wrote: >>> and bipolars more like a voltage source. >> Do you mean current source here? > No, I was talking about the on-state of switching applications when the B= JT > is saturated. The do look like a controlled current source in the linear > operating mode, but that's not relevant when we're talking about switchin= g > relay coils on and off. > Yes, sorry for the confusion - I missed the switching part as I didn't=20 read the rest of your post. Michael pointed it out just before too. --=20 http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .