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Limited current circuit with transistor

2016-05-07 10:44  
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Limited current circuit with transistor
The picture is a limited current circuit with operational amplifier.In the circuit,R9 and R10 are used to detect output current.When the voltage drop is more than 0.6V,VT1 and VT2 will stop to cut off current.In this case,the current of VT3 and VT4 is limited within 400mA.