Remote Telephone Ringer

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This remote telephone bell ringer allows you to use a large (and loud) external bell in place or in addition to the built in (and rather wussy) ringer in most modern telephones. This is ideal for large outdoor areas, noisy shops or those hard of hearing. Most any large bell can be used as the circuit can be easily adjusted for various supply voltages.

Schematic

Schematic for remote telephone ringer

Parts
Part
Total Qty.
Description
Substitutions
C110.47 300V Capacitor
C2147uF 25V Electrolytic Capacitor
R111K 1/4W Resistor
R2110K 1/4W Resistor
R311K Pot
R412K 1/4W Resistor
Q116A, 200V TRIAC
Q216A, 200V SCR (106, Etc.)
D111N4774 Zener Diode
D2, D321N4007 Rectifier Diode
U114N33 Opto Isolator
BELL1Large Bell (Fire Bell, School Bell, Etc.)
MISC1Board, Wire, Socket For U1, Case

Notes

  1. Virtually any TRIAC and SCR will work for Q1 and Q2 as long as the voltage rating is high enough. Q2 needs enough current capacity to handle the full load of the bell.

  2. To adjust R3, call the phone line on which the ringer is installed and adjust the pot until the bell begins to sound consistently.

  3. Make sure to check with local authorities before you connect a homemade device to your phone lines. Some areas mandate that only approved devices can be connected to the loop. This circuit provides an opto-isolator to prevent cosstalk between the phone line and power supply as well as to avoid ground loops.

Related Circuits
Ringing Phone Light Flasher, Phone Busy Indicator, FM Telephone Bug, Cut Phone Line Detector, Simple Phone Tap, Telephone Hold Button, Telephone Recorder, Remote Telephone Ringer

Comments

asutosh pradhan
Remote Telephone Ringer
Tuesday, July 29, 2008 11:39:47 AM
its a very wonderful circuit i really thanks to the person for making such cirfcuit whch will b very useful
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