I reread the requirements, AFAIK there are no op amps that will drive a 100 ohm load. -- ________________________________________________________________ Real friends are those who, when you feel you've made a fool of yourself, don't feel you've done a permanent job. ________________________________________________________________ Dennis K. Gearon (Kegley) Scientific Instrument Technician, School of EIT Oregon Institute of Technology - One of USA's 100 Best College Buys 3201 Campus Drive Klamath Falls, OR 97601 Voice 1-541-885-1563 FAX 1-541-885-1689 email gearond@oit.edu ________________________________________________________________