MAGNETIC DETECTING DEVICE AND ELECTROPHOTOGRAPHIC DEVELOPING DEVICE

摘要

PROBLEM TO BE SOLVED: To provide a magnetic detecting device capable of coping with the change of a sensitivity characteristic with an extremely low-cost means. SOLUTION: A differential transformer 1 outputs a detection signal in response to toner P. A driving circuit 2 drives the differential transformer 1. A signal processing circuit, 3 receives differential output E0 and outputs periodic voltage signals V01. A smoothing circuit 4 comprises a first resistance 41 and a capacitor 42 and smoothes the signals V01 outputted from the signal processing circuit. An output voltage control circuit 5 comprises a second resistance 51. One end of the second resistance 51 is connected to one end of the first resistance 41, and the predetermined voltage Vb is supplied to the other end of the second resistance 51.