Circuit 01: Fixed Input

In this circuit, we will use a fixed voltage input to test the LM3914 and the HDSP-4850 display.

To set the input range of the Signal at SIG between 0 V and 1.25 V:

Connect REFADJ to RLO and both to ground.
Connect REFOUT to RHI

To generate a voltage between 0 V and 1.25 V, we use a voltage divider with

R1=4.7K Ω
R2=680 Ω

The resulting voltage at the point between R1 and R2 is

U= R2 /(R1+R2) * 5V = 680/(680+4700) = 0.126 * 5V

U= 0.632 V

Category

Index Description Breadboard Module Brightness circuit_01 circuit_02 circuit_03 circuit_04 circuit_05

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