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

Parts

Part	Total Qty.	Description	Substitutions
C1	1	0.47uF 250V Capacitor
R1, R2	2	10K 1/4 W Resistor
R3	1	1K 1/4W Resistor
D1, D2	2	20V 1/4W Zener Diode
D3	1	1N4148 Diode
Q1	1	2N3904 NPN Transistor	2N2222
U1	1	4N27 Opto Isolator
RELAY	1	Solid State Or Regular Relay (See Notes)
MISC	1	Case, Wire, Board

Notes

You may need to use a lower voltage zener for D1 and D2.

You can use a regular relay instead of a solid state relay, but the arcing accross the contacts may destroy it pretty quickly.

Be very sure that you have not accidentally connected 120V to the phone line when building and installing this circuit.

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Comments

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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

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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