Description
Need a simple, reliable way to trigger a relay contact whenever a telecom device goes off-hook? The Viking LDB-1 Loop Detect Board provides an automatic dry relay contact closure in series with analog phone lines — no external power supply required.
The LDB-1 works by detecting any off-hook condition on the line and immediately initiating a relay contact closure. Because the relay is powered directly by the phone line itself, and both TIP and RING currents flow through the relay, excellent line balance is maintained throughout. For applications that need switched DC power instead of a dry contact, simply add the optional PS-2 power supply for added flexibility.
Our Expert Take: The LDB-1 is a straightforward, no-fuss solution for integrators who need loop detection without adding external power sources or complex wiring. Its phone-line-powered design keeps installations clean and minimizes points of failure — a smart choice when you need reliable contact closure tied directly to off-hook activity on an analog line.
Key Features
- Provides dry relay contact closure on any off-hook condition
- Used in series with telecom devices on standard analog phone lines
- Phone line powered — no external power supply needed
- Both TIP and RING currents flow through relay for excellent line balance
- Compatible with optional PS-2 power supply for switched DC power output
- Loop activated contact closure for simple, predictable triggering
Technical Specifications
- Power: Phone line powered (no external power supply required)
- Relay Type: Dry contact closure
- Trigger Condition: Off-hook detection on analog phone line
- Optional Accessory: PS-2 power supply for switched DC power