Re: [Electronics_101] We have suffered a sabotage
- THANK YOU AL LOT !!!
NO PROBLEM IF THE CIRCUIT EXPLOIT OR FIRE (WE CAN MAKE ONE NO FIRE CABINET
TO PUT THE CIRCUIT INSIDE .....
IF THE HIGH 220V AC OR 110 AC IS CUT IS ENOUGH FOR US.
And if this happened in 1 ms I guess its OK.
I guess is OK because one cheap UPS for computers change from line to
batteries and from batteries to line in about 3 or 4 ms. (if I remember
The computers have a lot of problems with the quality of the tension.
And if this delay work to protect the computers and the computers continue
working I guess this will work for this propose too.
And this looks like a not expensive circuit.
We can put two circuits, so if the first don't work probably the second
And we can put circuits with different sensibility too on the same line.
THANK YOU AGAIN FOR YOUR TIME AND ADVICES !!
We will make the test and then we will return to you and to the list the
OF COURSE IF THERE ARE OTHERS IDEAS WE WILL TEST TOO.
AND WE WILL GIVE THE INFORMATION TO THE LIST AFTER
THE TEST THE CIRCUITS.
----- Original Message -----
From: "Pablo E. Limon Garcia Viesca" <plimon@...>
Sent: Lunes, 02 de Diciembre de 2002 03:37
Subject: Re: [Electronics_101] We have suffered a sabotage
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> On Sunday 01 December 2002 21:38, you wrote:
> > We have suffered a sabotage in one of our telephone lines. Somebody
> > connects IN THE EXTERIOR of my office 220V AC to one of our Phone Lines.
> > Of course many equipments were burned.
> > Seemingly the gassy protectors are not prepared for this type of
> > We have tried to find an electronic equipment that protects us of these
> > situations for the future for all the cables that enter to our office
> > in the telephony stores or electronics stores don't have anything for
> > protection.
> > The only thing that they offer is gassy protectors.
> > PLEASE WE NEED A LITTLE OF YOUR HELP IN THIS TOPIC.
> > We need to build a simple circuit that works with a TENSION RELAY and
> > the wire comunication if there is more tension than the spected for a
> > paticular line.
> > They (on the electonic store) Told me that this it is a very simple
> > that any specialist in electronics could make in few minutes but we
> > have idea neither for where to begin.
> > The relay has to be of VERY QUICK because it is to protect our PHONE
> > and TV CABLE and VIDEO SECURITY CAMARAS BEFORE THAT THE HIGH TENSION GO
> > TRHU THEM AND BURN OUR EQUIPMENTS AGAIN.
> > THANK YOU A LOT FOR READ THIS MESSAGE,
> > AND FOR ALL THE HELP AND ADVICES.
> > Brian Walton
> Very bad!
> Is not that dificult
> but a question... if that happens again, the cirquit (but not the internal
> equipment) will blow out. No problem with that?
> we could do a combined circuit here, using some things that will blow out
> quik and other to absorb the energy...
> lets see...
> parts needed FOR EACH CABLE (wire) TO BE PROTECTED:
> for telefone cables that can raise voltage to over 100V... (check your
> company, if it is greater use a greater suppressor, if it is smaller, use
> Use one or two 1500Wats bidirectional Surge Clamping Diode rated at a
> down voltage of about 120V (you will need to experiment this values)
> note something, this break will occurr when it reaches the 120V, I would
> conect one Surge Clamping Diode for each pair in telefon cables and maybe
> to a ground system. then, ill wrap this things in tape doing a sandwitch
> two termal curoffs rated at the lowest tempereature you can find (60
> when an overvoltage occurs, the clamping diodes will do their work. If
> overvoltage comes with an amperage to exeed the 1500wat rating of the
> clamping diodes, this will generate heat and destroy themselfs. In this
> prosses, hopefully the heat will be grater that 60 degrees celsius and the
> thermal cutoffs will then burn opening the line. This in, agian hopefully,
> more than 1 ms... (at least the clamping diodes im watching are rated at
> See the graphics ill send here.
> In red the clamp diodes
> in gray the thermal shutoffs
> you should arrange like the fifure the components and wrap that in
> tape to avoid heat loss and the proper functioning of the whole system (so
> the shutoffs work and no electricity flows)
> You can make an arrangment and test it, im almost sure that it will work
> for more protection, you could add a gas discharge chamber in the INPUT
> and perhaps, anoder clamping diode after the thermal shutoffs and two
> fuses (one for each line (line----SSfuseSS---line)) at the end (less than
> 1/4th amp rating))
> Im almos sure that there will be more realible ways to do this protection,
> but I dont see anything bad with this design, if anyone sees it, please
> O... by the way... I present this info AS IS and accept no responsability
> it to work or not to work, I just took some knoldege of how this
> devices work and put it all together.... use it at your own
> And DO tests....
> - --
> Pablo E. Limon Garcia Viesca
> ID: 279930
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