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method, I would suggest you do. This method is so simple and easy andDoes anyone know of a way of etching PCBs (from plans printed off a
computer) using a PCB pen (the kind you get in budget PCB-etch sets).
I'm having problems lining up the tracks accurately enough to fit things
like ICs in.
Thanks in advance
David Morris
If you're willing to spend an extra few bucks for the photographic
Give it up, those pens are all crap.Does anyone know of a way of etching PCBs (from plans printed off a
computer) using a PCB pen (the kind you get in budget PCB-etch sets).
Laser print and acetone transfer.David Morris wrote:
Does anyone know of a way of etching PCBs (from plans printed off a
computer) using a PCB pen (the kind you get in budget PCB-etch sets).
I'm having problems lining up the tracks accurately enough to fit things
like ICs in.
Thanks in advance
David Morris
If you're willing to spend an extra few bucks for the photographic
method, I would suggest you do. This method is so simple and easy and
effective for home brew boards. The results are just great.
Just print on transparent paper, and then expose and process. You don't
even need an "exposure kit", just the developer will do to start.
Here's a picture of one of the simple boards I've done:
http://luna.forums.ws/bfoster/printer/prn2.jpg
Just out of curiosity, what is that board? A thermal printer module?Here's a picture of one of the simple boards I've done:
http://luna.forums.ws/bfoster/printer/prn2.jpg
Brett,
get to the point of no return....!"Mjolinor" <mjolinor@hotmail.com> wrote:
The button is not quite round if you look from above. With the flat side
upwards so it's like a "U" there is a small clipthat is part of the button
holding the button into it's housing, this cli[p is to the left of the flat
area, or, if youi prefer, towards you if you are vacumning.
Bit hard to explain that, if you dont understand then post again and I'll
have another go.
OK never mind
http://www.dknpowerline.com/Pictures/Dyson.jpg
stick a thin shim thing down where I put the arrow and lift the button
Many thanks, appreciate your help. Based on your advice, I was
eventually able to get yellow button off (paper knife, fair bit of
force - nervously!). But unfortunately that doesn't give me access to
the cable side of the switch as I'd hoped. Here's what I see:
http://www.terrypin.dial.pipex.com/Images/DysonSwitch.jpg
Do you know what that screw does? I'm reluctant to remove it in case
soemthing drops down inside.
In situations like this, you can usually just loosen a screw and see what starts moviing, before you
Yuppers. I bought these bulk thermal modules from a surplus store aIn message <bii9tf$a004v$1@ID-184277.news.uni-berlin.de
Brett Foster <spam@hotmail.com> wrote:
Here's a picture of one of the simple boards I've done:
http://luna.forums.ws/bfoster/printer/prn2.jpg
Brett,
Just out of curiosity, what is that board? A thermal printer module?
Thanks.
Seiko's datasheet but I'd be very interested in how the driver firmware forYuppers. I bought these bulk thermal modules from a surplus store a
while back.
That thermal module looks like a Seiko Instruments MTP401-40B. I've got
Does anyone have a schematic for a trifield meter, would really
appreciate it. Thank you.
Does anyone have a schematic for a trifield meter, would really
appreciate it. Thank you.
Better, at least it has some relative indication of strength on theAnd several others:
http://www.zen22142.zen.co.uk/Circuits/Testgear/emmeter.htm
http://www.zen22142.zen.co.uk/Circuits/Testgear/mgausmeter.htm
Won't allow access unless you have a password.http://www.electro-tech-online.com/viewtopic.php?t=67
--"Michael D. Pinho Sr." <res1fen4@verizon.net> wrote in message
news:XLg3b.13419$Jq1.7954@nwrddc03.gnilink.net...
Does anyone have a schematic for a trifield meter, would really
appreciate it. Thank you.
If you're really serious about EM fields, take a look at:In article <vl29glgn2713cc@corp.supernews.com>, fandanospam@catskill.net
mentioned...
This might get you in the ballpark:
http://www.zen22142.zen.co.uk/Circuits/Misc/emf.htm
But it doesn't have any relative indication at all; it needs a meter.
And it only detects EM, but not electrostatic fields.
s/EM/electrostaticIf you're really serious about EM fields, take a look at:
www.ee.nmt.edu/~langmuir/E100/E100.htm
I got Not Found error.On Sun, 31 Aug 2003 09:43:28 +0100, Watson A.Name - Watt Sun wrote:
In article <vl29glgn2713cc@corp.supernews.com>, fandanospam@catskill.net
mentioned...
This might get you in the ballpark:
http://www.zen22142.zen.co.uk/Circuits/Misc/emf.htm
But it doesn't have any relative indication at all; it needs a meter.
And it only detects EM, but not electrostatic fields.
If you're really serious about EM fields, take a look at:
www.ee.nmt.edu/~langmuir/E100/E100.htm
I am not an electrician or electrical engineer, but have questions for
those of you who are.
I have been having problems with my telephone. My telephone and TV cable
are connected (in some
manner) from Comcast. Comcast sent a technician out and he discovered my
television sets were
feeding voltage into the system. He said the device is not designed to
take voltage from the
output side of the box. Their connecting box (I have no idea what it is
called) converts one
type of signal to another for both telephone and television reception.
One TV (kitchen counter) had approximately 64 volts AC between the cable
antenna sheathing and
the wall circuit ground. (All of my wall outlets are properly grounded
and were recently
checked by an electrician.) After the technician left, I dug out my
multimeter and tested it
myself. I disconnected the cable from the kitchen TV and placed one test
lead on the threaded
portion of the TV connector and one test lead in the ground opening of the
wall outlet. The TV
was still plugged in to the wall outlet naturally. The voltage fluctuated
between 62 and 68
volts. Unplugging the TV loses the voltage as expected.
The technician checked the other TV sets in my home and found they all had
a voltage across the
same ground connections but in the 8 to 20 volt range. He made some
wiring changes to the
outside connection box and said the cable feed now bypassed the phone
connection so I should no
longer have the problem on the my phone.
My questions are:
Why is there a potential across the grounded antenna shielding and the
outlet ground?
Is this normal?
Why so high on one TV?
Should I consider replacing the TV with the high voltage?
Is this a dangerous situation? I am concerned.
Thank you,
Jim Y
Today's TV sets have one side of the AC input connected to the internalI am not an electrician or electrical engineer, but have questions for
those of you who are.
I have been having problems with my telephone. My telephone and TV cable
are connected (in some
manner) from Comcast. Comcast sent a technician out and he discovered my
television sets were
feeding voltage into the system. He said the device is not designed to
take voltage from the
output side of the box. Their connecting box (I have no idea what it is
called) converts one
type of signal to another for both telephone and television reception.
One TV (kitchen counter) had approximately 64 volts AC between the cable
antenna sheathing and
the wall circuit ground. (All of my wall outlets are properly grounded
and were recently
checked by an electrician.) After the technician left, I dug out my
multimeter and tested it
myself. I disconnected the cable from the kitchen TV and placed one test
lead on the threaded
portion of the TV connector and one test lead in the ground opening of the
wall outlet. The TV
was still plugged in to the wall outlet naturally. The voltage fluctuated
between 62 and 68
volts. Unplugging the TV loses the voltage as expected.
The technician checked the other TV sets in my home and found they all had
a voltage across the
same ground connections but in the 8 to 20 volt range. He made some
wiring changes to the
outside connection box and said the cable feed now bypassed the phone
connection so I should no
longer have the problem on the my phone.
My questions are:
Why is there a potential across the grounded antenna shielding and the
outlet ground?
Is this normal?
Why so high on one TV?
Should I consider replacing the TV with the high voltage?
Is this a dangerous situation? I am concerned.
Thank you,
Jim Y
Somewhat. The usual method of wiring a TV or radio with a two prongI am not an electrician or electrical engineer, but have questions for those of you who are.
I have been having problems with my telephone. My telephone and TV cable are connected (in some
manner) from Comcast. Comcast sent a technician out and he discovered my television sets were
feeding voltage into the system. He said the device is not designed to take voltage from the
output side of the box. Their connecting box (I have no idea what it is called) converts one
type of signal to another for both telephone and television reception.
One TV (kitchen counter) had approximately 64 volts AC between the cable antenna sheathing and
the wall circuit ground. (All of my wall outlets are properly grounded and were recently
checked by an electrician.) After the technician left, I dug out my multimeter and tested it
myself. I disconnected the cable from the kitchen TV and placed one test lead on the threaded
portion of the TV connector and one test lead in the ground opening of the wall outlet. The TV
was still plugged in to the wall outlet naturally. The voltage fluctuated between 62 and 68
volts. Unplugging the TV loses the voltage as expected.
The technician checked the other TV sets in my home and found they all had a voltage across the
same ground connections but in the 8 to 20 volt range. He made some wiring changes to the
outside connection box and said the cable feed now bypassed the phone connection so I should no
longer have the problem on the my phone.
My questions are:
Why is there a potential across the grounded antenna shielding and the outlet ground?
Is this normal?
The usual TV antenna jack has a coil of wire across the pins, and theWhy so high on one TV?
Another alternative is to use a pair of ceramic capacitors to isolateShould I consider replacing the TV with the high voltage?
Is this a dangerous situation? I am concerned.
--Thank you,
Jim Y
I am not an electrician or electrical engineer, but have questions for those of you who are.
I have been having problems with my telephone. My telephone and TV cable are connected (in
some
manner) from Comcast. Comcast sent a technician out and he discovered my television sets were
feeding voltage into the system. He said the device is not designed to take voltage from the
output side of the box. Their connecting box (I have no idea what it is called) converts one
type of signal to another for both telephone and television reception.
One TV (kitchen counter) had approximately 64 volts AC between the cable antenna sheathing and
the wall circuit ground. (All of my wall outlets are properly grounded and were recently
checked by an electrician.) After the technician left, I dug out my multimeter and tested it
myself. I disconnected the cable from the kitchen TV and placed one test lead on the
threaded
portion of the TV connector and one test lead in the ground opening of the wall outlet. The
TV
was still plugged in to the wall outlet naturally. The voltage fluctuated between 62 and 68
volts. Unplugging the TV loses the voltage as expected.
The technician checked the other TV sets in my home and found they all had a voltage across
the
same ground connections but in the 8 to 20 volt range. He made some wiring changes to the
outside connection box and said the cable feed now bypassed the phone connection so I should
no
longer have the problem on the my phone.
My questions are:
Why is there a potential across the grounded antenna shielding and the outlet ground?
Is this normal?
Why so high on one TV?
Should I consider replacing the TV with the high voltage?
Is this a dangerous situation? I am concerned.
Thank you,
Jim Y
Unlikely to effect ALL his TV's I would have thought?You may have one
or both of the following problems: The cable input connector (isolating
device) has become defective, allowing excessive current to flow.
Both sides, actually. How else would the TV work?Today's TV sets have one side of the AC input connected to the internal
circuit board and its components.