resistance error gauge circuit with IC

Published:2011/6/18 10:15:00 Author:Nancy | Keyword: resistance error gauge, IC | From:SeekIC

The circuit uses voltage divider R5 and R7 to form a window descriminator connected to pin 8 of TCA965. The width of the window is adjusted by the voltage at pin 9. The width of the window can be set as 64mV（+US=12）by appropriately setting the value of R9 as 22Ω. Under small window width,the measurement accuracy is relative to the error of the R6 and R7. Since the circuit TCA963 output has 50mA load current, it can directly drive relay coil or LED.



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