Telephone Line Ring Indicator (KIT57S)

This circuit is design to provide a visual or audible indication whenever a telephone rings. This would be particularly useful for anyone with impaired hearing, or in noisy environments such as factories or workshops.

An on-board LED is included, which flashes whenever the telephone rings. Also included is a relay, which in turn could be used to control an external light or siren.
Requires a 12V DC supply, sold separately.

Provision for pcb terminals is included, but the terminals should be purchased separately. See Order Codes PLB612 (2-way) and PLB613 (3-way).

By adding a few additional items, a complete, professional system can be created, at a fraction of the normal price. Items not included in the kit, but sold separately, are:-
STK67S: Power Supply, 12V dc/1.2A
PCI29S: Enclosure
CNP122: DC Power Socket, panel-mount
BZP00S: 12V Twin Piezo High Output Siren
LED103: 10MM Clear Red LED
RSA681: 680ohm Resistor