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Post by Barry Mead on Mar 15, 2023 11:06:59 GMT -8
Gary: I found this schematic on the net, but it has some issues and I wanted your opinion on it. Even though the "Nominal" line voltage is 51 volts (without the ring signal) the peak positive voltage is around 168 volts, so I was wondering why the LM2936Z doesn't fry when the first ring signal comes through? It has a listed maximum survival input voltage of 60V? Also the author states that to the caller it appears that the phone is never answered, but later in the article he explains that the ring signal is interrupted because the mosfet tricks the system into thinking the phone was answered, so it stops the ring signal from continuing. Which to me means that the caller would think that someone answered and hung up not "didn't answer" as stated in the beginning of the article. Your thoughts? www.instructables.com/Invisible-Killer-of-the-Phone-Ring/ |
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Post by Barry Mead on Mar 15, 2023 11:35:26 GMT -8
From my perspective the "Ideal" circuit would be one that Stopped the phones on the line from ringing (when enabled), but did not appear to the other end that the phone was answered.
I can handle the micro-controller timer that enables/disables the thing at various times of day easily. (I already designed an ATMEL AT-MEGA-328 chip circuit and software that handles on/off times
and even allows for Daylight Savings Time changes automatically.
What I was thinking was a circuit that "CLAMPS" the voltage peaks to around 60 volts when enabled. I don't know if that would make the phone line think it was answered or not. Would a 60V MOV work?
I am not very familiar with these devices, or how to switch them in and out of the phone line circuit electronically. Any Thoughts?
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Post by volkswagenvan on Mar 15, 2023 22:03:10 GMT -8
Hi Barry. That`s quite the project your undertaking! I think I would just turn the ringer off at night. A MOV will clamp (Short) at the voltage it is designed for. It is used a lot for protection of over voltage spikes. Read up on selecting one here,... www.mouser.com/pdfdocs/bourns-tips-on-selecting-the-right-mov-surge-suppressor-white-paper.pdfI believe that just stopping the voltage spike that causes the phone to ring would work the same for you. MOV across the line. Personally, I got rid of the land line a few years back and just use my cell phone for everything including internet on my home computer. My phone company would never check my line even if I twisted the wires together and left them that way. Lol |
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Post by lamazoid on Mar 16, 2023 2:41:58 GMT -8
does anyone still use landline phones these days? even those in the offices, are in fact IP phones, line functions are emulated within the main router, which connects via optic|twisted pair|radio to the provider. so there's no physical (dedicated) phone "line" between , say, "station" and client , like it was previously. nowhere to connect your phreak devices (in old times called "boxes"). even here in russia, where 40% of people still use wood stoves & backyard toilets, its very rare thing  |
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Post by volkswagenvan on Mar 16, 2023 3:18:55 GMT -8
The funny thing is I have a wood stove and probably 40% of our state has one to!
Yep, usable outhouse out behind the barn. Just in case!
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Post by lamazoid on Mar 16, 2023 6:34:53 GMT -8
The funny thing is I have a wood stove and probably 40% of our state has one to! Yep, usable outhouse out behind the barn. Just in case! i do like woodstoves (even DIY welded some), but in a country, which lives entirely for exporting oil & gas that is not fun at all  usual case, when the gas pipe travels on your street, but making a tap and 10-20m pipe to your house costs enormous money, you can buy firewood for rest of your life funny, that in old times , the same thing was happening with landline phones. in a typical city 36-apartment block, only few people had it. but there always was a thick phone cable with enough pairs to connect everyone in that block. |
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Post by retiredat55 on Mar 17, 2023 1:01:06 GMT -8
I am still connected by a copper line with the telephone company a few hundred meters from my house.
It is now used for my DSL connection for internet.
Since a few weeks we have also a fiber glass line in the street, but it will be connected to an acces point
in my house later this year.
About the wood stove, here the wood is expensive! Exept for people with some connections....
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Post by volkswagenvan on Mar 17, 2023 19:06:44 GMT -8
They have been running fiber optic cable around here for TV, Phone and internet for the last two years. en.wikipedia.org/wiki/Fiber-optic_cableI don`t know if I will ever have it to my house or not. We live in the woods! Fire wood is easy to find around here. Not to easy in the larger city`s where they have no forest`s. Can't see the forest through the trees! |
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Post by retiredat55 on Mar 18, 2023 1:02:16 GMT -8
Here everything is regulated, it's not allowed to collect your own firewood......
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Post by volkswagenvan on Mar 18, 2023 15:30:56 GMT -8
Wow,... That`s hard to believe but, we are spoiled here in the USA compared to many other country's.
Here, if nobody own`s the land you are able to cut firewood to heat your house. Permit is around $20.00 for the year.
Cutting campfire wood is permitted free as long as your going to use it soon.
I think I bought two permits in my life so far. You never get checked but if your on a main road... you get one. Just in case!
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usual case, when the gas pipe travels on your street, but making a tap and 10-20m pipe to your house costs enormous money, you can buy firewood for rest of your life 
