At 04:00 PM 7/2/2007, James Newton, Host wrote: >Short version: What is the absolute minimum footprint driver circuit (NOT >SMT) that will work from an Open Collector output with a 4.7K pull up to +5 >(PC parallel port nStrobe pin) and drive a small OMRON G5LE-1 DC5 which has >a 5 volt, 63 Ohm coil? N-channel MOSFET. Suggest 47R resistor in series with the gate (reduces / stops parasitic oscillation) and don't forget the back-EMF diode across the relay. You can omit the 47R gate resistor if you slide a ferrite bead over the Gate lead before inserting into the PCB. Part numbers: 2n7000, 2n7001, 2n7002 (maybe), vn2222, vn2105, vn2106 All of the above are logic-level MOSFETs in TO-92 package or similar. I have 2 different versions of 2n7002: one is a TO-92 just like the 2n7000, the other is a sot23-6 package with 2 identical MOSFETs inside. Go figure . . . One other question: why wouldn't you use a 24V relay if you have a 24V rail handy? No need to cause extra heat dissipation on your 5V regulator if you can avoid it. dwayne -- Dwayne Reid Trinity Electronics Systems Ltd Edmonton, AB, CANADA (780) 489-3199 voice (780) 487-6397 fax www.trinity-electronics.com Custom Electronics Design and Manufacturing -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist