The Lectrosonics FC ISO9VOLT is a professional battery eliminator designed to provide clean, regulated, and isolated DC power to Lectrosonics wireless microphone transmitters from an external source. This device allows users to bypass disposable or rechargeable 9-volt batteries by drawing power from a standard 12-14 volt DC supply, such as those provided by camera battery plates or portable power distribution boxes. Its primary function is to ensure uninterrupted operation during long recording sessions, live broadcasts, or studio work, eliminating the risk of a transmitter dying mid-take due to battery failure. The "ISO" in its name signifies its key feature: isolated power conversion, which prevents ground loops and hum that can be introduced when connecting audio equipment to shared power sources, thereby preserving the pristine audio quality Lectrosonics systems are known for.

The unit is engineered for reliability and ease of integration into professional production workflows. It typically features a locking connector that mates securely with the transmitter's DC input port, a robust cable, and a standard 2.1mm x 5.5mm DC output plug for connecting to the power source. The internal circuitry precisely regulates and filters the input voltage, delivering a consistent and noise-free 9 volts to the transmitter, regardless of fluctuations in the source voltage. This stable power not only enhances audio performance but also can contribute to more consistent RF output from the transmitter. Its compact and rugged build makes it suitable for use on camera rigs, in sound bags, or as part of a permanent installation.

For sound mixers in film, television, and broadcast, the Lectrosonics FC ISO9VOLT is an essential accessory for mission-critical applications. It is commonly used when a transmitter is mounted on a camera (for director or camera operator commentary), integrated into a hard-wired IFB or talkback system, or used for long-duration events like theatrical performances or all-day conferences. By providing a continuous and clean power feed, it removes the logistical burden and cost of battery management, increases operational reliability, and allows the audio professional to focus entirely on capturing perfect sound without power-related interruptions.