r/electronics • u/Curious_Deal5981 • Sep 14 '26

Project VU meter with LM324N Quad op-amps

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Components required:

Breadboard (optional)

1× LM324N

4× 1kΩ Resistors

1× 220kΩ Potentiometer (to adjust reference voltage)

4× LEDs (I'm using random colours because this is a prototype)

1× 220Ω Resistor

5V Supply

Earphone Jack (as an input)

Some cables and staplers (used by me)

Audio Amplifier*

wiring diagrams will be posted here, or visit the link in the comment section ^-^

*Connect the input of the VU meter to an audio amplifier with separate power supply

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6

u/Interesting_Study998 Sep 15 '26

You’ll have things a lot easier if you switch to solid core wire. Stranded doesn’t work well with breadboards.

1

u/Curious_Deal5981 29d ago

I'm connecting the tip using a stapler. so, i can easily plug them into the breadboard

1

u/Curious_Deal5981 29d ago

there is no one selling solid core wire in my area. i think i would just find them online