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Wednesday, October 21, 2009

Non Interacting Adjustments for Expanded Scale Meter

This is one application for function of LM3814. This circuit is called expanded scale meter. This is the figure of the circuit.


This arrangement allows independent adjustment of LED brightness regardless of meter span and zero adjustments. First, V1 is adjusted to 5V, using R2. Then the span (voltage across R4) can be adjusted to exactly 0.5V using R6 without affecting the previous adjustment. R9 programs LED currents within a range of 2.2mA to 20mA after the above settings are made. [Schematic diagram source: National Semiconductor, Inc]

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