AC-DC three-digit voltmeter circuit

Published:2011/8/11 4:36:00 Author:John | Keyword: three-digit voltmeter | From:SeekIC

The voltmeter circuit’s input stage uses operational and a diode feedback to form a linear peak rectifier circuit. Then the circuit is isolated via R2/R3 divider and is sent to A / D converter CA3162E output from the dual integral multiple BCD. It can be also said to that the 0 ~ 1V DC test voltage is directly added between the differential inputs ⑾ and ⑽ of the CA3162E. If ⑽ is not connected to ⑺ for use, resistor with less than100kΩ should be used to connect to them. The voltmeter input ranges from 0 to +9.99 V. It only displays the peak value of the AC input voltage. When AC rms should be displayed, the transform circuit is needed to attenuate appropriately.



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