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| 62,209 | 24 |   |
24 |
| Author | Views | Views Today | Rank | Comments |
| 62,209 | 24 | |
24 |
| 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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| 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. | ||
| 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 | ||
| Hi! Please tell me why we need the two Zener Diode? | ||
| 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. | ||
| 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??? | ||
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