Lm3915 Calculator Updated May 2026

The best updated calculators now offer features that mimic lab equipment.

Legacy calculators often assumed a 5V or 12V supply. An updated calculator asks for your actual supply voltage (e.g., 9V battery or 24V industrial rail). It then warns you if your desired reference voltage exceeds the supply minus headroom (typically Vs - 1.5V). lm3915 calculator updated

For most common projects, you can simply use the table below. This assumes a standard LED current of roughly 10-12mA. The best updated calculators now offer features that

| Desired Max Voltage | R1 (Brightness) | R2 (Range) | | :--- | :--- | :--- | | 1.25V Range | 1.2kΩ | 0Ω (Direct to GND) | | 5V Range | 1.2kΩ | 3.6kΩ | | 10V Range | 1.2kΩ | 8.2kΩ | | 12V Range | 1.2kΩ | 10kΩ | It then warns you if your desired reference

Note: To fine-tune the range, replace R2 with a potentiometer or a trimmer resistor.