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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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???

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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???