| T O P I C R E V I E W |
| n/a |
Posted - Jun 04 2003 : 08:13:59 AM
please can some one help me in finding a working cut phone line circuite. I need it urgently.
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| 15 L A T E S T R E P L I E S (Newest First) |
| audioguru |
Posted - May 31 2006 : 11:19:53 PM
quote:
what is the voltage rating of 4n35 ic and its resistor connections?
Why not look on its datasheet? It also says its max current ratings.
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| ebusoft |
Posted - May 27 2006 : 1:51:32 PM
[[what is the voltage rating of 4n35 ic and its resistor connections
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| YS |
Posted - Jul 17 2004 : 12:17:41 AM
Hi Samuel.
The input of 4n35 is an infrared LED and its voltage is always less than 2V.The resistor is needed to limit the current.How do you know that optoisolator does not work? What kind of secondary circuit did you connect there?
If the voltage is 1.5V, then the rest of it (10.5V in your case) has to be dissipated on the resistor. With 470 Ohm, by Ohm's law, Iopto= 10.5/0.47= about 25mA which is more than enough for 4n35 to work.But its output is a low-signal phototransistor and must be used accordingly.
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| n/a |
Posted - Jul 14 2004 : 09:15:28 AM
Hi Dear YS
Thank you for youe help.
As you guid me, I used 4N35 serial with 470 Ohm Resisitor as Load of Cut phone line detector circuit.
But OptoKoupler Doesen't Work therefore i Used 100 ohm and even less Resistor But the current is about 160 mA and cause that 4N35 be very hot and finallay i lose it.
it is interesting that when use Dc motor as load the voltage of dc motor is about 9V and current is aboaut 50 mA but when use 4N35 voltage of 4N35 is 1.5 and it's current is 160mA.
I use 12V as Power Source of Circuit and When Line is Ok My Load Can Work (it's Voltage is about 12-1.4=10.6 Vs=1.4 but when I use 4n35 why it's Voltage is 1.5 in this mode ????)and When line is Cut The Voltage of Load is 0 .
What you Recommand me about using other OptoKoupler( What Type) or How I can Decrease 160 mA if you recommand me 4N35.
Thanks o lot
sincerely : Samuel
Samuel |
| n/a |
Posted - Jul 14 2004 : 09:15:24 AM
Hi Dear YS
Thank you for youe help.
As you guid me, I used 4N35 serial with 470 Ohm Resisitor as Load of Cut phone line detector circuit.
But OptoKoupler Doesen't Work therefore i Used 100 ohm and even less Resistor But the current is about 160 mA and cause that 4N35 be very hot and finallay i lose it.
it is interesting that when use Dc motor as load the voltage of dc motor is about 9V and current is aboaut 50 mA but when use 4N35 voltage of 4N35 is 1.5 and it's current is 160mA.
I use 12V as Power Source of Circuit and When Line is Ok My Load Can Work (it's Voltage is about 12-1.4=10.6 Vs=1.4 but when I use 4n35 why it's Voltage is 1.5 in this mode ????)and When line is Cut The Voltage of Load is 0 .
What you Recommand me about using other OptoKoupler( What Type) or How I can Decrease 160 mA if you recommand me 4N35.
Thanks o lot
sincerely : Samuel
Samuel |
| YS |
Posted - Jul 09 2004 : 10:11:47 PM
Yes
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| n/a |
Posted - Jul 09 2004 : 06:49:38 AM
HI YS
Are still in this address ?
thanks
khalifa
Yuli Starodubtsev
320 Knollwood Drive
Hampstead, NC 28443 USA
quote:
Hi Khalifa,
I got your emails and replied at once, several times. But it never reached you for some reason, it was always returned to my hotmail address by your web server. Maybe it is set to block hotmail? I am still there, though.
Best regards,
YS
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| YS |
Posted - Jul 03 2004 : 9:57:08 PM
Hi Khalifa,
I got your emails and replied at once, several times. But it never reached you for some reason, it was always returned to my hotmail address by your web server. Maybe it is set to block hotmail? I am still there, though.
Best regards,
YS
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| n/a |
Posted - Jul 03 2004 : 08:55:38 AM
quote:
Hi Khalifa,
I am happy to hear you have done it. You put so much efforts and dedication in your project, we all can learn from it.
Good luck with your job!
My address is yulis14@hotmail.com.
Best regards, YS
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| YS |
Posted - Nov 01 2003 : 10:30:15 PM
Hi Khalifa,
I am happy to hear you have done it. You put so much efforts and dedication in your project, we all can learn from it.
Good luck with your job!
My address is yulis14@hotmail.com.
Best regards, YS
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| n/a |
Posted - Nov 01 2003 : 08:01:11 AM
I have finished my project..i have done it for 8 lines.it working fine and it is in production. have asked me to do the same for more 8 lines. I would realy thank u again for your help. any i need your home address if your dont mind.
thanks
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| n/a |
Posted - Nov 01 2003 : 07:57:44 AM
YS
it is a long time my old friend...how are u.
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| YS |
Posted - Jul 10 2003 : 11:27:05 PM
You are very welcome, Khalifa.
PCB kits may be available at www.mouser.com, www.digikey.com, www. jameco.com and so on.
Good luck!
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| n/a |
Posted - Jun 20 2003 : 09:01:31 AM
]With out your help I would not even have my LED to flash. Thank you SIR.
Thank you again for the information, I think I will go with the counter at this time and I will think of the PC port at later stage. Any idea where can I order printed circuit board kits as it is very hard here to find the solution for the boards here. I know they are available in the state.
Thanks
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| YS |
Posted - Jun 19 2003 : 11:24:42 PM
So, you got it working - congratulations!
if yu want to connect it to PC, think of using printer port. On most newer computers it is bidirectional, and even on oldest PC you still have 5 input lines, TTL or CMOS (5V) level. You do not need the counter; software can do that. Just connect an output of 4N35 to appropriate wire. Connect grounds, of course. Also you do not need 5V to power right side of 4N35 if you manage to connect it (+5V wire) to one of the output pins of printer port and set it to high level, which will be between 4 and 5V. You can keep a filtering capacitor to prevent ring coming, but I would rather make it in software - and at the same time you can even distinguish rings (they come at 20Hz frequency). There is some information on this website concerning printer port use for automation, but I think you do not need any hardware beyond described above. Just make sure you use optoisolators between PC and phone line.
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