telephone on hook off hok allmichael covingtontelephone on hook off hok mc from mcovingt aisun ai uga edu michael covington mc organization ai programs university of georgia athens mc aye there s the rub if you draw enough current to light an led th mc equipment at the phone company will think you ve gone off hook mc in the on hook state you re not supposed to draw current ok lets have some calculation here going by australian standards which i presume might be similar to other countries if not lets have some input a phone uses ohm to loop a v line ma a standard led drains ma so what is the actual loop current required for an off hook indication do you know cheers peter t
