| Author | Views | Views Today | Rank | Comments |
| 41,962 | 5 |   |
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| Author | Views | Views Today | Rank | Comments |
| 41,962 | 5 | |
20 |
| 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. |
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| 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 | ||
| hi can u plzz send me the complete details of ringing phone lighe flasher plzzzz. THANK YOU | ||
| 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. | ||
| 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??? | ||
| i need full description about this | ||
| 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??? | ||
| 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... | ||
| its very nice. do you have the circuit for mobile phones also. | ||
| 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 | ||
| 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 | ||
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