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.
Diego E Pomeranec
door bell chimer Light Flasher
Friday, October 24, 2008 1:11:59 PM
I am deaf since i was born. I have moved to a new house where there are four bedrooms. I am getting difficult of getting a new door bell with flasher. I am living in argentina south America where there is not enough upgraded technology. I am wondering if you do have some knowledge about this technology and I am willing to purchase the items to develop my own door bell with RF flasher/chime. What I need for my new home is : -one wire door bell button for the front door (already have one installed) - one main door bell chime with RF sender and a flasher (wireless) (for the kitchen where there is already a wire door bell phone) -four wireless RF receiver with flasher and chime (one for each room)(I don’t know how far can RF receive the signal from the RF sender as maxium and remember that my house is too big like that 20 meters away X 20 meters away) Door bell button --> main wire bell chime with RF sender / Flasher --> 1th wireless RF receiver / Flasher-chime / RF sender --> 2nd wireless RF receiver / Flasher-chime / RF sender --> 3th wireless RF receiver / Flasher-chime / RF sender --> 4th wireless RF receiver / Flasher-chime / RF sender I hope you could get some time for make it up and thanks for your time Regards Diego E Pomeranec
Paul
Ringing Phone Light Flasher
Thursday, September 11, 2008 4:08:56 AM
Hi! Please tell me why we need the two Zener Diode?
tbode
Ringing Phone Light Flasher
Wednesday, August 27, 2008 4:12:44 PM
I used this circuit on a analog extension off my plant phone system so I can open a gate at a remote facility when someone calls me without going out to the gate.
vergel
Ringing Phone Light Flasher
Tuesday, May 20, 2008 12:03:16 PM
project works done.anybody can help us to convert int a triac insted a relay? pl's send it ti my email. vergel at the philippines
thejus mathew thomas
Ringing Phone Light Flasher
Sunday, May 11, 2008 5:51:01 AM
hi can u plzz send me the complete details of ringing phone lighe flasher plzzzz. THANK YOU
Shaunak
Ringing Phone Light Flasher
Sunday, May 04, 2008 2:09:27 AM
A possible substitute for the 4N27 Opto Isolator is: CNY17 IC. I tried it, it works well. Also, Plastic capacitors of the required value are fairly easy to find, you could possibly use those instead. They are sold in bright orange packaging and are rectangular.
jhong
Ringing Phone Light Flasher
Friday, January 25, 2008 2:08:32 AM
gudday sir..... i cant find the value of 0.47uF 250 volts becoz the value of 250 volts are very too high.. can i bypass the capacitor instead???? how can i do that???
anonymous
Ringing Phone Light Flasher
Thursday, January 17, 2008 11:31:15 PM
i need full description about this
jhong
Ringing Phone Light Flasher
Friday, January 11, 2008 4:00:24 AM
gudday sir.. can i ask question about the capacitor.. i can't find the value of 0.47microfarad 250volts.... is there a replacement for that capacitor???
anonymous
Ringing Phone Light Flasher
Sunday, December 02, 2007 5:41:10 AM
This is for POTS lines not mobile phones. As for generating a +5v rail that's up to you to supply/build that on the ohter side of the circuit. Someone has suggested using a triac instead of a relay, this would work better and you can supply some opto's with an AC supply. This however is not a circuit for the beginner. If you don't understand how! buy a plug in flash unit. Mains kills...
suma
Ringing Phone Light Flasher
Thursday, November 22, 2007 1:09:05 AM
its very nice. do you have the circuit for mobile phones also.
John carter
Ringing Phone Light Flasher
Saturday, October 20, 2007 12:07:10 AM
I would like to build one of these for use in my shop but I don't understand what the two 5v. inputs are and where they come from. Could someone explain that please. Thanks, John
arjun
Ringing Phone Light Flasher
Friday, September 14, 2007 7:57:11 AM
i would ike 2 know dat how is it possible 2 supply frequency 4 this circuit do v have 2 use a mobile phone or is there any other alternative
nasrul
Ringing Phone Light Flasher
Monday, September 03, 2007 9:30:04 PM
thaks a lot for sharing the circuit. My new project involve this designing area.
evans
thank u very much
Friday, July 06, 2007 5:31:18 AM
I thank u very much for all what u have done for me now thank u byeee
anonymous
Ringing Phone Light Flasher
Thursday, June 14, 2007 10:25:37 PM
I would suggest that by using a Triac to replace the relay, so that will not have arcing and contact problem.
vishnu
Ringing Phone Light Flasher
Wednesday, June 13, 2007 7:58:48 AM
pls connect a 10uf/25 v capacitor accross the base and ground of transistor q1. so that you can avoid relay chattering and arcing of contacts.
anonymous
Ringing Phone Light Flasher
Sunday, June 10, 2007 5:10:45 PM
I have a phone that has neon bulbs connected directly to the phone line and they flash when the phone rings.
bidemi
As my project
Friday, June 01, 2007 12:51:06 PM
good day to u sir, I saw this topic Ringing Phone light Flasher and am so interest in it. Iam in my final year and i want to constructed it as my project ,therefore i need ur assit how to get some important information on particular on this topic like the circuit daigram and how to construed it .thanks i need ur replyto my box. thanks
Jesse Gonzalez
Ringing Phone Light Flasher
Monday, May 21, 2007 12:43:52 AM
I am not much into electronics. Is there any way some "pro" could build it for me and then sell it to me for a very reasonable price. The ones out in the "market" are too expensive and I cannot afford them. I need it for my mother. She is 79 years old and very hard of hearing. Thank you for any and all responses and assistance on this request.
John M. Rowland
Ringing Phone Light Flasher
Thursday, April 26, 2007 7:08:36 AM
Where may I buy a Printed Ckt. Board for the phone flasher ?? Would really like to build it,mhowever I would like a board for a more permanent type of constrution and installation..... John..
Kevin S. Brady
Ringing Phone Light Flasher
Sunday, April 08, 2007 5:35:56 PM
I built this exact circuit more than 10 years ago. I used a mechanical relay, albeit one rated for high current. It still works great. I put a single 120V outlet on the side of the box so I could plug anything in to it. The key to using a mechanical relay is to limit the 120V load. That will ensure long contact life. I use a single 25W bulb, but if you want it to get your attention you could plug in a string of Xmas lights. Thanks for posting this schemo!
Ibrahim Ibrams
Ringing Phone Light Flasher
Tuesday, March 13, 2007 4:07:26 AM
.its avery nice circuit and its usefull in industreyal zones and factorys
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