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CA3162 handheld voltmeter circuit

Using an integrated circuit CA3162 and some electronic components can be made a simple handheld voltmeter . In this digital voltmeter, the voltage measured is digitized in an analog-digital converter (A / D) and then displayed with three decimal. The display type is not usually seven segments, but consists of three groups of ten LEDs.
Range is up to 1V (at full scale), can be extended up to 10V or more, using the voltage divider R1-R2-R3.
Measured value is read on three LED bars: the first one, D1 - D10, indicate units: the second, D11-D20, decimals: and the third, D21 - D30, hundreds. The circuit is zeroed with P1, in this case the entry left in the air diodes D1, D11 and D21 are on (diodes D10, D20 and D30 is figure 9).
Then, apply a known input voltage and adjust P2 until LEDs indicate the correct value.

Testers
Circuit Diagram: 
CA3162 handheld voltmeter circuit diagram

Comments

Submitted by Anonymous on Mon, 07/27/2015 - 06:31.
I would like to build this but it appears that CA3162's are rare and very expensive these days. Does anyone know of a microcontroller equivalent of this circuit? I was starting out with a PIC microcontroller but can't seem to figure out how to set 10 digit decimal output. Any assistance or ideas would be greatly appreciated. Many thanks in advance.

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