Your suggestions? :) I do have a couple of ideas in mind or more, just wanted to share them. It's for the already-mentioned FMI device. I'm testing the software and etc. with a step-down DC-DC from Repcom, but it's input is only 18-72 and has no shutdown. I need some 4-5mA actually, just to put some 1KHz sine wave into a 600ohm line. TIA -- Ciao, Dario -- Cyberdyne -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist