CURRENT DETECTING CIRCUIT FOR AMPLIFIER

摘要: PURPOSE:To attain an accurate current detection by fixing a potential of positive side terminal on operational amplifier the voltage zener diode and differentially amplifying drop detecting resistor. CONSTITUTION:Both ends resistor 10 are connected to both input terminals 11 through resistors, also 17 18 in series output power supply making base driving circuit 6 be operated. Also, is resistor, constitution made so that proportional obtained between 18. That is, fixed 18, values feedback 13 earth 16 adjusted make operate as differential amplifier; therefore, unchanged with transistor 5 stage, can accurately detected.