The HK1523 is a mono linear LED audio indicator with a built-in microphone and microphone preamplifier, designed for visual indication of sound level. The device is suitable for applications where ambient sound level indication is required without direct audio input connection.
The audio signal is captured directly by an electret microphone, and the input sensitivity can be smoothly adjusted using a trimmer potentiometer. The indicator is linear and uses 12 LEDs to display the sound level.
The device operates from a DC supply voltage in the range of 12 to 15 V and can also be powered from a car battery. The main PCB dimensions are 104 x 36 mm, while the microphone preamplifier PCB measures 31 x 22 mm.

Technical Specifications:
Application: sound level indication, audio indicator, visual sound projects.
Indicator type: mono linear LED indicator (12 LEDs).
Input signal: built-in microphone.
Sensitivity adjustment: trimmer potentiometer.
Supply voltage: 12 - 15 V DC.
Current consumption: up to 120 mA.
Main PCB dimensions: 104 x 36 mm.
Microphone preamplifier PCB dimensions: 31 x 22 mm.

This product is a fully assembled module.