Suresh mano Posted July 15, 2016 Report Share Posted July 15, 2016 Hi , please Help me to assemble a digital ac voltmeter using ic7107 . Anybody give the circuits. Quote Link to comment Share on other sites More sharing options...
audioguru Posted July 15, 2016 Report Share Posted July 15, 2016 The ICL7107 is very old and has problems with accuracy when it warms up. The ICL7107S is an improved one. Its datasheet has a circuit that is recommended by the manufacturer. Quote Link to comment Share on other sites More sharing options...
sureshmano Posted July 17, 2016 Report Share Posted July 17, 2016 Please Send me that circuit Quote Link to comment Share on other sites More sharing options...
admin Posted July 17, 2016 Report Share Posted July 17, 2016 You will need to convert your AC voltage to RMS voltage then feed it to ICL7107. Datasheet has such a circuit on page 14. I attaching it here for your reference. The connection to the display is as the second attachment. Quote Link to comment Share on other sites More sharing options...
suresh mano yahoo Posted July 19, 2016 Report Share Posted July 19, 2016 Can i give Direct 300Vac at ca3140 in Series with 100Kohms.. I need to Measure 300VAc In this circuit please. Help me to design this circuit.. Quote Link to comment Share on other sites More sharing options...
audioguru Posted July 20, 2016 Report Share Posted July 20, 2016 300VAC has a peak of 424V that will arc across an ordinary 100k resistor and destroy any opamp. Use a high voltage 100k resistor, a voltage divider and a voltage clamp that limits the opamp input voltage. Quote Link to comment Share on other sites More sharing options...
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