Description
If you need a simple, reliable way to know when your analog phone line is ringing or in use, the Viking LDB-2 monitors line status automatically and triggers a built-in relay so you can act on it instantly.
The LDB-2 watches your analog phone line for two key conditions: incoming ring voltage and an active loop connection. When either is detected, the onboard relay activates — giving you a clean signal output you can use to drive a visual indicator, alert system, or any other device that needs to know the line is busy or ringing. An internal pot lets you fine-tune whether the relay holds steady or follows the natural ring cadence of the incoming call, giving you flexible control over how your connected equipment responds.
This compact unit mounts easily on any wall using the included foam tape and connects to your phone line and devices through simple screw terminals. The auxiliary 12V DC output adds extra versatility for powering small connected devices directly from the unit.
Our Expert Take: The LDB-2 is a straightforward solution that solves a very real problem — knowing when a line is active without tapping into a complex phone system. It's especially useful in warehouses, workshops, or loud environments where a ringing phone simply gets missed. Pair it with a strobe light or audible alerter on the relay output and you have an instant visual or audio notification system without any programming or complicated installation. The selectable NO/NC relay contacts mean it fits into nearly any existing control circuit without rewiring.
Key Features
- Monitors analog phone lines for both incoming ring voltage and in-use loop connection
- Built-in relay activates automatically when ring or loop condition is detected
- Adjustable internal pot controls relay behavior — steady hold or ring cadence follow
- Adjustable time-out for relay closure
- Two sets of relay contacts provided
- Selectable NO (normally open) or NC (normally closed) relay operation
- Auxiliary 12V DC output for powering connected devices
- Screw terminal connections for easy, tool-friendly wiring
- Wall mountable using included foam tape or screws (not included)
Technical Specifications
- Line Compatibility: Standard analog phone line
- Detection Modes: Ring voltage, loop connect (in-use)
- Relay Contacts: Two sets, selectable NO or NC
- Relay Timing: Adjustable time-out for relay closure
- Auxiliary Output: 12V DC
- Connections: Screw terminals
- Mounting: Wall mount via included foam tape or screws (not included)