My application is to calibrate some instruments with help of this source. I’ve studied your circuit earlier also., but I want a battery operated mV source. upto 100mV full scale which is portable but still very accurate. The better the accuracy more good for me! I want to use 9v battery or a set of rechargeable batteries for powering this circuit.
I’ve constructed some prototype tell me how can I send you the schematic? (file format e.g. jpg, *.tiff, *.bmp etc…, i’m using Orcad 9.2 and Express PCB Schematic softwares for Schematics).
Also I need a 4 1/2 digit LCD display for this circuit(Or any good one). I’m referring ICL7129/ Max7129 IC datasheet for this. Do you have any 2v DVM/ DPM circuits, can you please email me the same! …please!
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Beckman Multimeter with the ICL7129
“Unlike the HD110 however, this is a 20,000-count 4½ digit model with RMS-responding AC capability.”
ICL7129 is a high precision monolithic 4-1/2 digit A/D converter that directly drives a multiplexed liquid crystal display.
About millivolt source look here Circuits FAQ – Millvolt Source see another see millivolt source, pdf at Analog-2 – Instrumentation Circuits
I have completed the millivolt circuit, but I need some more information regarding using ICL7129 for driving a 4 1/2 digit LCD for displaying the
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