No audio connection required. The VU meter is a voice-activated sensor that powers on and flashes in response to sound, without any microphone or audio cables needed. Independent comparator circuit option. When used with an independent comparator circuit, the structure and operating principle are slightly more complex, but the overall approach remains straightforward and easy to implement. Flexible power and protection. Operates from 5 to 12 V DC and includes safeguards to protect the circuit from wiring mistakes. Reverse polarity protection diode. Equipped with a reverse polarity protection diode to help prevent damage if the power supply is connected with the wrong polarity. Key benefits - Simple, plug-and-play sound visualization with no external audio wiring required - Clear visual feedback of sound levels via flashing indicators - Easy integration into projects that use an independent comparator circuit - Wide voltage compatibility (5-12 V DC) for flexible use with common power supplies - Built-in safety features to guard against incorrect power connections Applications - DIY audio visualizer for home studios, music rooms, and speaker setups - Sound-activated indicators in microcontroller projects, demonstrations, or interactive displays - Educational experiments and hobby electronics where visible sound feedback is helpful Specifications at a glance - Power supply: 5-12 V DC - Activation: voice-activated sensor, no audio connection required - Circuit option: compatible with independent comparator circuits - Protection: reverse polarity protection diode included to prevent power-related damage