Ringing Phone Light Flasher


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I have received several emails asking how to connect up some lights so that when the phone rings, they flash. This is very useful in a situation were there is lots of noise and it is impossable to hear the phone, such as a workshop. Here is such a device. The ring detect part of this circuit came from http://www.hut.fi/Misc/Electronics/circuits/telephone_ringer.html.

Schematic

Schematic for phone flasher

Parts

Part
Total Qty.
Description
Substitutions
C110.47uF 250V Capacitor
R1, R2210K 1/4 W Resistor
R311K 1/4W Resistor
D1, D2220V 1/4W Zener Diode
D311N4148 Diode
Q112N3904 NPN Transistor2N2222
U114N27 Opto Isolator
RELAY1Solid State Or Regular Relay (See Notes)
MISC1Case, Wire, Board

Notes

  1. You may need to use a lower voltage zener for D1 and D2.
  2. You can use a regular relay instead of a solid state relay, but the arcing accross the contacts may destroy it pretty quickly.
  3. Be very sure that you have not accidentally connected 120V to the phone line when building and installing this circuit.

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

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anonymous
Ringing Phone Light Flasher
Saturday, June 27, 2015 12:19:18 PM
I have modified the circuit to work in my situation. A pair of 110 volt regular light bulbs come on each time the phone rings. The ring voltage was too low to work with this circuit after I installed MagicJack so I needed to make a more sensitive circuit. Also, the circuit here is an always-on diagram. I need one that comes on only when the phone rings.You may write to me and I will send you the diagram. I also have a couple of good-working circuits that I designed.
MeIsHere
Ringing Phone Light Flasher
Thursday, January 31, 2013 8:52:50 PM
Thank you for the circuit , I was tested this circuit , and it works good . 68
TONY
Ringing Phone Light Flasher
Tuesday, November 13, 2012 4:45:46 PM
Can you substitute the +5V dc with +12V dc for the relay side of the circuit, as I cannot find solid-state relays that works with less than 12V dc.
AbiG
Ringing Phone Light Flasher
Sunday, July 29, 2012 6:13:27 AM
Thank you for defining this circuit; I was able to make it work...but I notice that the Relay chatters or turns On/Off while Ringing. Normally, Telephone Ring is not continuous – it produces ringing tone once in 2 seconds…then the Relay also turns On/Off proportionately. I believe adding a Capacitor to delay the turn OFF won’t work in this circuit as it works in Negative going pulse. Is it possible to replace the circuit with PNP transistor? OR Is there any standard way to turn the Relay ON continuous ?
AbiG
Ringing Phone Light Flasher
Saturday, June 02, 2012 11:21:12 AM
Telephone Ringing. Telephone Ring is not continuous – it produces ringing tone once in 2 seconds…then the Relay also turns On/Off proportionately. I believe adding a Capacitor to delay the turn OFF won’t work in this circuit as it works in Negative going pulse. Is it possible to replace the circuit with PNP transistor? OR Is there any standard way to turn the Relay ON continuous ?
Phil
Ringing Phone Light Flasher
Sunday, May 06, 2012 12:45:14 PM
Well it does work butit works wrong the transistor is a npn so the relay is on until the phone rings., great if you are using a double pole relay not so great if your not . And yes the triac trik will work but why not use a solid state relay which has an inbuilt opti in it anyway so its just a cap one diode 1 resistor and the solid state relay
Michael
Ringing Phone Light Flasher
Wednesday, January 18, 2012 9:14:26 AM
Working on an offshore platform, I put this circuit in our emergency-phone, using 2 LED´s instead of D3 & U1 (Otherwise i used the spcified components), so the operators easily can identify when someone is calling on that line..Thanks :-)
John Stancliff
Ringing Phone Light Flasher
Monday, January 09, 2012 9:36:16 PM
Schematic show a external voltage of 5 Volts.... no reference given in notes concerning this..... why?

(Editor's notes: It is assumed the reader will make up a 5V supply. Or just use 3 1.5V batteries in series.)

Laguna
Ringing Phone Light Flasher
Monday, December 19, 2011 8:20:41 PM
Sir, i have prepared every part of the circuit and constructed it diligently according to the schematic but nothing happened. Please help me solve about it. I may have missed some details of the circuit.
C N Dhavan
Ringing Phone Light Flasher
Saturday, November 22, 2008 3:50:46 AM
AS per the above electronic drawing, we have prepared the circuit with all specified components. But the circuit is not working. Please advise us next corrective action.
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