Loop Detect Board

Model: LDB-1

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Product Details

The LDB-1 provides a loop activated contact closure when used in series with telecom devices on analog phone lines. The LDB-1 will initiate a dry relay contact on any off-hook condition. Alternatively, add the optional PS-2 power supply to provide switched DC power.

The relay itself is phone line powered and does not need an external power supply. Because both TIP and RING currents flow through the relay, excellent line balance is maintained.

Applications

Provide relay closure on off-hook
Trigger a security camera
Trigger a tape recorder
Phone “In Use” indicator

Certifications

FCC Part 68
FCC Part 15

Specifications

* Note: If driving an inductive load a protection device must be placed across terminals 6 and 7.

Dimensions	47.6mm x 30.5mm (1.875” x 1.2”)
Mounting	(2) #4 screws (not included) or foam tape (included)
Shipping Weight	0.45 kg (1 lb)
Added Loop Resistance	40 Ohms
Maximum Loop Current	125 mA
Minimum Loop Current	18 mA
Operating Temperature	-26° to 54°C (-15° to 130° F)
Maximum Supply Voltage Input	35 VDC
Maximum 12V Supply Current	500 mA with PS-2
Longitudinal Balance	63 dB minimum
Maximum Contact Voltage	200 VDC
Maximum Contact Current	500 mA
Maximum Contact Power	10 W Resistive*
Connections	7 pin screw terminal block