Use LM 3914 Integrated circuit to make an LED meter as Volt meter or Audio level indicator. Only a few discrete components are required to construct a Bar graph display in addition to this IC. LM 3914 / 3915 / 3916 version ICs are used in display circuits to drive either individual LED or Matrix LED. These are mainly used in circuits where precision output display is needed. Its each output becomes low one by one with the increment of 125 milli volts in its input. Let us see the details of its design.