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The drive circuit of bridge sensor

2016-05-15 03:01  
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The drive circuit of bridge sensor
In the circuit, Al is the constant current output circuit, and constant value is decided by the UZ (VD1 stable voltage) and (R (RP1) + R2), and it is bridge sensor (RA-RD constitute a bridge circuit) to provide constant current bias. A2-A4 constitute an instrumentation amplifier, which can amplify the small signal output by sensor to the needed level.