• on Test & Measurement
  • Published in issue 7/2013 on page 68
About the article

Accurate Universal Measurement Interface

Accuracy—quite simply

Accurate Universal Measurement Interface
Most microcontrollers have a built-in digital-to-analog converter (DAC), but what can we do when this isn’t accurate enough? Look no further: the solution is right in front of you.
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Gerber file

CAM/CAD data for the PCB referred to in this article is available as a Gerber file. Elektor Members can exclusively download these files for free as part of their Membership. Gerber files allow a PCB to be produced on an appropriate device available locally, or through an online PCB manufacturing service. Elektor recommends its business partner Eurocircuits as the company of choice for its own prototypes and volume production in selected cases.

Components
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The BOM (Bill of Materials) is the technically exhaustive listing of parts and other hardware items used to produce the working and tested prototype of any Elektor Labs project. The BOM file contains deeper information than the Component List published for the same project in Elektor Magazine. If required the BOM gets updated directly by our lab engineers. As a reader, you can download the list here.
Want to learn more about our BOM list? Read the BOM list article for extra information.
COMPONENT LIST
Resistors
R1,R2R9,R12 = 470Ohm 5%
R3,R4 = 220Ohm 5%
R5,R6 = 22kOhm 1%
R7,R8 = 2.2kOhm 5%
R10,R11 = 4.7kOhm 5%
Capacitors
C1,C2 = 10nF 50V 10%
C3,C4,C5 = 1µF 50V 10%
C6 = 100nF 50V 10%
C7 = 10µF 16V 10%, electrolytic
Semiconductors
D1,D2 = LL4148
IC1 = MCP3421A1T
IC2 = MCP602SN

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