Voltage Level Indicator Circuit Design using LM339 for 9 Volts Battery Charger Voltage

An interactive LED, diode, Op-Amp and resistor circuit built in the DCACLab online simulator by supot sookpotharom.

What's inside

1× Battery
2× Resistor (999 Ω, 998 Ω)
1× LED
1× Diode
1× Switch
1× Op-Amp
1× Potentiometer
1× Buzzer
Measured with Multimeter

Tags

Op-Amp Buzzer Diode LED Switch Potentiometer Multimeter Battery Resistor

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By supot sookpotharom
Saved October 08, 2026
557 views

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Tags: Op-Amp Buzzer Diode LED Switch Potentiometer Multimeter Battery Resistor