Repurposing Model III j-box level sensors for modern rigs

Gear

ZephyrCan I fly my Alexa or RED on a Zephyr?389

Master SeriesIs a used Master Series rig worth buying as a first big rig?191

BFDHow do I power my BFD receiver from my camera or sled?186

VoltCan I retrofit a Volt onto my existing sled or gimbal?168

ArtemisHow do I power my camera and accessories from an Artemis sled?166

MDRWhere can I mount my Preston MDR on my rig?143

ModulusIs there a Modulus option for HD wireless video?141

G-70Will my G-70 fit my vest, gimbal or sled?126

FI+ZCan I control iris and zoom wirelessly, not just focus?60

HU3Where can I get my HU3 repaired, refurbished or repainted?60

CineLiveHow do I pack and case my CineLive rig for transport?54

G-70XHow does the G-70X compare to Pro Titan, Xarm and other arms?46

Trinity 2Is Trinity 2 SUP 3.0 firmware safe to install or buggy?46

Ultra VestWhich vest should I choose for my body size, comfort and operator type?39

2008Sled forum

18 years old. Gear and prices may have changed since.

A Model III j-box contains an electronic bubble level sensor that can be repurposed as a camera leveling indicator
The level sensor can be integrated with an LM3914 chip to drive LED indicators for real-time angle monitoring
Mounting the level sensor closer to the support post reduces false readings caused by speed and acceleration changes
The repurposed level indicator can be mounted on a monitor arm or attached with adhesive backing for flexible positioning

The original bubble level is inherently sensitive to motion and speed changes, limiting reliability in dynamic situations
This modification requires electronics knowledge or access to someone with electronics expertise
The project was completed on a custom-built rig, so results may vary with different configurations
Original j-box connector wiring documentation appears unavailable, making restoration to original function difficult