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Posted - Sep 14 2004 : 10:14:13 AM
Hi everyone!
I installed a tape phone recorder to automatic record incoming and outgoing calls but i have one problem, I have dsl using the same line and i have filter for it but my recorder keeps record continueosly instead of record only when the phone is picked up, i suspect that the filter does not filter all the signal from dsl, is there any thing i can do? do i need a stronger filter and where can i find it? any help would be appreciate
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| 7 L A T E S T R E P L I E S (Newest First) |
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Posted - Sep 22 2004 : 12:52:00 AM
It is hard to makea filterwithout knowing much bout the recorder; but try to put a capacitor in parallel to phone line. I would start with 1000pF. It has to be a high-voltage device. If you have some lightning protection on the phone line, the cap should be rated 300V at least; if you do not have protection, 1500V will be safe enough. They are not cheap though. Of course, for experiment you can take 100V cap; but if you are satisfied with filtering, replace it with a safe one.
The bigger value means better filtering, but at some point it will reduce audio quality and maybe even affect your DSL.
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Posted - Sep 18 2004 : 1:13:09 PM
The recorder is not broken, my dsl line is coming from the main outside box so it feeds every phone jacks in the house. I have tried every phone outlet and it's still not working, there is still noise with the filter and even more noise without the filter when recording, but with the filter I can talk on the phone without noise so i assume that the filter is installed correctly. Thanks
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Posted - Sep 18 2004 : 12:47:33 AM
Oops.. sorry. I assumed you are asking about the schematic on this page (http://www.aaroncake.net/circuits/phonrec.htm).
So, you just bought the recorder? And you want to add a filter to it?
You can probably make the separate filter yourself; but it should be calculated to fit properly into the system and it really depends on how the recorder circuit is built.
Maybe, your existing filter is not installed right or something like that? Or, the recorder is broken? Have you tried it on non-DSL line?
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Posted - Sep 17 2004 : 3:06:28 PM
Again, sorry for asking. What is the R3 and where is it located? How many ohms does the capacitor need/ Thanks so much for helping
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Posted - Sep 16 2004 : 11:18:14 PM
DSL has high-frequency signals which may affect the circuit. By placing the capacitor parallel to R3, you filter hi-F signals out.
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Posted - Sep 15 2004 : 11:38:05 AM
quote:
Hi,
try to place a capacitor across R3. Value may vary. I would try ceramic 0.1uF ... 1uF.
I am sorry, I dont know much about electronic, can you explain ?
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| YS |
Posted - Sep 14 2004 : 11:55:34 PM
Hi,
try to place a capacitor across R3. Value may vary. I would try ceramic 0.1uF ... 1uF.
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