AC/DC 3 digits voltmeter circuit

Published:2011/4/5 22:51:00 Author:Nicole | Keyword: AC, DC, voltmeter | From:SeekIC

The input stage of this voltmeter circuit uses operational amplifier and diode feedback to form linearity peak value rectifier circuit. Through R2/R2 partial pressure isolation, it is sent to double multi-channel BCD output A/D converter CA3162E, it also can add 0~1V DC tested voltage to CA3162E differential input terminal between ⑩ and ⑾, If ⑩ is not used to connected ⑦, than it should need a resistance below 100kΩ to connect them. The range of this voltmeter is 0~+0.99V, it only can display peak value about AC input voltage, if need to show AC effective value, it should decay transformation circuit appropriately.



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