Hello,
I've taken a look at the LM3914 datasheet and I want to build one of the applications which is bar display with alarm flasher (attached schematic). I need help with the calculation for the input signal's range of voltage.
As I've understood in this thread, the R2 & R1 voltage divider determines the max signal input. However, in the attached schematic, is the input signal range 0-4.44 V? With the R1 and C1 junction, why is there a 100 ohms resistor at LED no. 10?
Which part should I modify to make the input signal range from 0-5V or any higher range than that? What is the suitable voltage supply to power the IC and LED that I would need if so?
Your help in the circuit calculation is very much appreciated.
I've taken a look at the LM3914 datasheet and I want to build one of the applications which is bar display with alarm flasher (attached schematic). I need help with the calculation for the input signal's range of voltage.
As I've understood in this thread, the R2 & R1 voltage divider determines the max signal input. However, in the attached schematic, is the input signal range 0-4.44 V? With the R1 and C1 junction, why is there a 100 ohms resistor at LED no. 10?
Which part should I modify to make the input signal range from 0-5V or any higher range than that? What is the suitable voltage supply to power the IC and LED that I would need if so?
Your help in the circuit calculation is very much appreciated.
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