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20_mA_FLOATING_SOURCE

2015-03-19 07:55  
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20_mA_FLOATING_SOURCE
Battery-operate d circuit shown gives adequate stability for strain-gage bridge. Uses four alkaline penlight cells to provide ±3 V for 741 opamp. E1 is chosen to give adequate voltage for intended load at maximum load current. Temperature stability is 0.7 μA/℃ from 0 to 50℃. -R. Tenny, Isolated Current Source, EDN Magazine, April 20, 1973, p 85.