In this article I’m sharing simple 10 LED VU Meter circuit and PCB layout. This circuit is works based on KA2281 IC, its downloadable PCB layout is also sharing with you for quick refence. You can use This PCB layout for build a mono Vu meter.
10 LED VU meter Circuit
This Circuit board is designed very neat and clean. All components part number labelled on the board in white color, so their is no difficulty to identify the compononets.
The components are minimal and total cost of the circuit is very cheap. This Board represents the MONO VU meter. If you want to build a stereo vu meter, build another one. The 10 LED is enough for covering all audio signals.
KA2281 / TA7666 Stereo Audio Level Indicator ALM 712 Ready Module Sound Audio Spectrum Analyzer DC6V-12V
- It is made of premium material, durable and has long service life. 100% brand new and high-quality. Best for school science projects, & Hobby electronic projects
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| Sl. No | Component | Value | Quantity |
|---|---|---|---|
| 1 | IC | KA2281 | 1 |
| 2 | Resistor | 150Ω | 1 |
| 3 | Resistor | 1KΩ | 10 |
| 4 | Resistor | 47KΩ | 2 |
| 5 | Resistor | 56KΩ | 1 |
| 6 | Resistor | 68KΩ | 1 |
| 7 | Resistor | 100KΩ (Preset/Pot) | 1 |
| 8 | Capacitor (Electrolytic) | 10µF | 1 |
| 9 | Capacitor (Electrolytic) | 100µF | 1 |
| 10 | Capacitor | 1µF | 1 |
| 11 | LEDs | Any color | 10 |
| 12 | Power Supply | 12V DC | 1 |
| 13 | Input Connector | Audio IN | 1 |
| 14 | Terminal | Power terminal (+12V, GND) | 1 |
Connections Details
This circuit is works on 12V dc single supply. The KA2281 IC working voltage is rated as 5 to 16V DC. but i recommended to use 12V 1A DC power supply. You can directly takes in from the amplifier supply section.
From the IC LED connected through the 1K resistors. Actually the KA2281 is a stereo VU meter IC. The circuit designed for mono vu meter.
A 1000uf capacitor is connected in the 12V DC supply for smoothening the DC supply. This will reduces the false triggering of lights due to noise in the input voltage.
