Analog and 3-1/2 digital display for +/- 199.9mV


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Analog and 3-1/2 digital display for +/- 199.9mV - del20009

This Circuit is a DPM or digital panel meter. It has a analog bar graph display and a 3-1/2 digit digital display. ICL7107 is used in the 200mV configuration.

U4A opamp LF353 amplifies the 200mV Full scale input to the level required for the LM3914 display circuit. D13-D14 are clamping protection diodes. Adjust P1 trimpot for a reading of 1000 counts when a 100.0 mV signal is fed at Vin. Adjust R8 trimpot to get the 5th led to just turn on at 100mV input.

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Analog and 3-1/2 digital display for +/- 199.9mV - del20009

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Data sheets and info useful to study and build this circuit.
National P N LM3914 - Dot Bar Display Driver
National Semiconductor Products Catalog National Semiconductor Products
Intersil [PDF] ICL706, ICL7107, ICL7107S Digital Voltmeter

ICL7107 Voltmeter with PCB LM3914 Voltage Monitor

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