3 LED Voltage Indicator

by ElektroNeo · 2026-10-31

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This is a 3 LED Voltage Indicator circuit for 12V Lead Acid Batteries

Parts

Part	Count	Values and models
Diode	6	1N4739, LED_RED, 1N4740, 1N4741
Resistor	3	1k, 560, 120
Voltage source	1	{V1}

Picture

3 LED Voltage Indicator: schematic and simulated waveforms of a leds & lighting circuit — 3 LED Voltage Indicator: schematic and simulated waveforms, made with Benchspice.

Simulation

This circuit is set up for a operating point analysis: .op. Run it in your browser, change values and see the waveforms update.

SPICE netlist

* 3 LED Voltage Indicator - Main
.param V1=12.19
V1 n001 0 {V1}
D4 n002 n003 1N4739
D5 n002 0 LED_RED
R4 n001 n003 1k
D6 n004 n005 1N4740
D7 n004 0 LED_RED
R5 n001 n005 560
D8 n006 n007 1N4741
D9 n006 0 LED_RED
R6 n001 n007 120
.model 1N4739 D(Is=1e-14 N=1 Rs=5 Cjo=220p M=0.4 Bv=8.96 Ibv=28m)
.model LED_RED D(Is=1e-18 N=1.8 Rs=10 Cjo=10p)
.model 1N4740 D(Is=1e-14 N=1 Rs=7 Cjo=200p M=0.4 Bv=9.825 Ibv=25m)
.model 1N4741 D(Is=1e-14 N=1 Rs=8 Cjo=180p M=0.4 Bv=10.816 Ibv=23m)
.op
.end