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Notebook computer sized cells..... Where to buy ?
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Folderol
electronics forum beginner


Joined: 14 Jun 2006
Posts: 1

PostPosted: Wed Jun 14, 2006 8:27 pm    Post subject: Re: OSS-friendly PC-connected PIC-type board? Reply with quote

On Fri, 19 May 2006 22:32:34 GMT
John Stumbles <john.stumbles@ntlworld.com> wrote:

Quote:
Sorry about all the hyphens :-)

I want to play^H^H^H^Hexperiment and learn about PIC-type systems, and I
run Linux on my PC.

Is there a cheap system with a PIC or similar micro:
- with analogue & digital I/O, timers, PWM outputs and other goodies
- which hooks up to a PC via serial, parallel, USB or ethernet
- can be programmed from the PC e.g. into flash
- with open-source tools for writing & loading code & interfacing to it?

Initial projects I'd like to try include
- measuring temperature at several points using cheap sensors (maybe
diodes or perhaps AD273s), sensing mains voltage on-off signals
(via opto-isolators?) and possibly liquids flows (if I can find or make a
flow sensor)

- similar to above but driving a small AC pump on and off (optocoupler +
triac or SSR)

- driving a bunch of LEDs on a wand to make a moving text display
(project for the nipper)

I'm looking for something available in the UK.

This is something i would also be interested in.

I'm disappointed to see no replies to the OP :(

--
Will J G
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mc
electronics forum Guru


Joined: 29 Dec 2005
Posts: 475

PostPosted: Sat Jun 17, 2006 4:32 am    Post subject: Re: Modifying ATX PSU from AC-DC to DC_DC Reply with quote

"joseph2k" <cooltechblue@google.com> wrote in message
news:p%Kkg.98116$H71.34584@newssvr13.news.prodigy.com...
Quote:
sharez wrote:

Looking for any information on how to possibly convert a standard
ATX
psu to run off of DC input (say 12-30v). I know there are commercially
available DC-DC psu's, I'd just like to make use of one or more of the
old psu's I have lying around.
There are plenty of 12V dc (car battery) to 120V ac converters out there,
the technology is not real hard. Build or buy?

I would certainly buy an off-the-shelf inverter and plug the ATX power
supply into it.

The ATX power supply probably starts by rectifying the incoming AC and then
chops it. So, without major redesign, the only thing you can do is add a
stage ahead of it to step up the DC voltage (and convert it to AC). That's
exactly what the inverter does.

Now there may be somebody who has designed a 12-volt DC-input ATX power
supply -- which would be a quite different beast from an ordinary ATX power
supply.
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Paul Nutteing
electronics forum beginner


Joined: 19 Mar 2006
Posts: 6

PostPosted: Fri Jun 23, 2006 7:04 am    Post subject: Re: 8yr old Satellite dish planninig permission madness Reply with quote

fancyabrew <kjhoskin@yahoo.co.uk> wrote in message
news:1150974467.701286.288340@b68g2000cwa.googlegroups.com...
Due to some shite stirring form someone in our lane, we don't know
who yet, my next door neighbour got a letter from Caradon Council (Its
in Cornwall) planning department yesterday, telling her she hasn't
got planning permission for her satellite dish (we're in a
conservation area). Now the dish has been up for over 8 years, so this
is obviously a load of rubbish from Caradon, as they can't make her
take it down as its been up for a long time and would automatically get
retrospective planning permission, BUT can they still make her apply
for retrospective planning regardless? Which is going to cost her
around £100 or could she just tell them to sod off?

This kind of petty crap really winds people up, me included, there are
loads of dishes around in our village and I don't know of one who has
ever applied for planning, yet there are some really big planning
abuses that Caradon do nothing about. I suppose its easier to pick on a
60 year old woman with an 8 yr old satellite dish. I've told her to
put in a Freedom of Information request asking for details of ALL
satellite dish planning applications submitted within Caradon in the
last 8 years, and information on what action they have taken against
those householders who haven't requested planning permission, that
should put the cat amongst the pigeons.

Reply

I thought I'd be constructive by directing you to
a product that was demonstrated on "Tomorrow's World"
in early days of satellite TV (BBC TV prog on gadgetry that has
long since passed over).
It was a Fresnel lens of rings of foil on a carrier that
you stuck to a south facing window and put the
receiver horn at the focus inside the room.
You had to give the company your latitude and longitude
and what satellite and the direction faced by
your window and the asymmetric rings would be
constructed for your situation.
But I can find no reference to it as a product.
Someone posted a tradename Mawzone but
nothing known, anyone know if it was a scam
like this one
http://www.nutteing.2.freeservers.com/scam.htm
Perhaps with the "Mawzone" you had to change your
window glass to something more like the Fylingdale
mushroom covers. Anyone on s.e.m know what
I'm on about?
http://www.setileague.org/articles/fresnel2.htm
for SETI doesn't look promising.
Is there a commercial product based on this?

What they aren't telling you about DNA profiles
and what Special Branch don't want you to know.
http://nutteing.boom.ru/dnapr.htm
or nutteingd in a search engine.

Valid email nutteing@fastmail.....fm (remove 4 of the 5 dots)
Ignore any other apparent em address used to post this message -
it is defunct due to spam.
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CWatters
electronics forum Guru


Joined: 02 May 2005
Posts: 494

PostPosted: Fri Jun 23, 2006 5:15 pm    Post subject: Re: 8yr old Satellite dish planninig permission madness Reply with quote

"Paul Nutteing" <nutteing@quickfindit.com> wrote in message
news:4g1i38F1l86jtU1@individual.net...
Quote:
fancyabrew <kjhoskin@yahoo.co.uk> wrote in message
news:1150974467.701286.288340@b68g2000cwa.googlegroups.com...
Due to some shite stirring form someone in our lane, we don't know
who yet, my next door neighbour got a letter from Caradon Council (Its
in Cornwall) planning department yesterday, telling her she hasn't
got planning permission for her satellite dish (we're in a
conservation area). Now the dish has been up for over 8 years, so this
is obviously a load of rubbish from Caradon, as they can't make her
take it down as its been up for a long time and would automatically get
retrospective planning permission, BUT can they still make her apply
for retrospective planning regardless?

I believe she should apply for a "certificate of lawfulness" on the grounds
that the "unauthorised structure" has been there for more than four years.
She will need to prove this. Has she got a bill for the original
installation? How about an old photo of the house? Old Sky bill?

Note that planning decisions are SUBJECTIVE where as COL is OBJECTIVE. In
other words a retrospective planning application could be refused because
the dish is "ugly" where as a COL can only be decided on fact.

Some info here..

http://www.bournemouth.gov.uk/Residents/Planning_Development/Planning_Applications/CertificateOfLawfulness.asp

Quote:
This kind of petty crap really winds people up, me included,

I know exactly how you feel. I've had my own planning problems and will no
doubt face this exact same one in a few months

Good luck

Colin (colin.watters@turnersoakNO*SPAM.plus.com remove "NO*SPAM")
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Peter Crosland
electronics forum beginner


Joined: 23 Jun 2006
Posts: 1

PostPosted: Fri Jun 23, 2006 8:55 pm    Post subject: Re: 8yr old Satellite dish planninig permission madness Reply with quote

Quote:
I believe she should apply for a "certificate of lawfulness" on the
grounds that the "unauthorised structure" has been there for more
than four years.

Not in a conservation area. The rules are different.

Peter Crosland
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CWatters
electronics forum Guru


Joined: 02 May 2005
Posts: 494

PostPosted: Sat Jun 24, 2006 8:38 am    Post subject: Re: 8yr old Satellite dish planninig permission madness Reply with quote

"Peter Crosland" <g6jns@yahoo.co.uk> wrote in message
news:449c554c$0$955$ed2619ec@ptn-nntp-reader01.plus.net...
Quote:
I believe she should apply for a "certificate of lawfulness" on the
grounds that the "unauthorised structure" has been there for more
than four years.

Not in a conservation area. The rules are different.


Thanks for that. I've not been able to find anything on the web that says
the four year rule doesn't apply in a conservation area. Can you expand a
bit?
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Palindr☻me
electronics forum addict


Joined: 10 May 2005
Posts: 76

PostPosted: Sat Jun 24, 2006 9:19 am    Post subject: Re: 8yr old Satellite dish planninig permission madness Reply with quote

CWatters wrote:
Quote:
"Peter Crosland" <g6jns@yahoo.co.uk> wrote in message
news:449c554c$0$955$ed2619ec@ptn-nntp-reader01.plus.net...

I believe she should apply for a "certificate of lawfulness" on the
grounds that the "unauthorised structure" has been there for more
than four years.

Not in a conservation area. The rules are different.



Thanks for that. I've not been able to find anything on the web that says
the four year rule doesn't apply in a conservation area. Can you expand a
bit?


Planning (Listed Buildings and Conservation Areas) Act 1990

....

2) Subsection (3) of section 63 of the principal Act (references to
applications for planning permission to include applications for
permission to retain existing works and uses) does not apply to the
construction of this section.

--
Sue
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CWatters
electronics forum Guru


Joined: 02 May 2005
Posts: 494

PostPosted: Sat Jun 24, 2006 3:01 pm    Post subject: Re: 8yr old Satellite dish planninig permission madness Reply with quote

"Palindr?me" <me9@privacy.net> wrote in message
news:129q0tbr9oi2le6@corp.supernews.com...
Quote:
CWatters wrote:
"Peter Crosland" <g6jns@yahoo.co.uk> wrote in message
news:449c554c$0$955$ed2619ec@ptn-nntp-reader01.plus.net...

I believe she should apply for a "certificate of lawfulness" on the
grounds that the "unauthorised structure" has been there for more
than four years.

Not in a conservation area. The rules are different.



Thanks for that. I've not been able to find anything on the web that
says
the four year rule doesn't apply in a conservation area. Can you expand
a
bit?


Planning (Listed Buildings and Conservation Areas) Act 1990
...

2) Subsection (3) of section 63 of the principal Act (references to
applications for planning permission to include applications for
permission to retain existing works and uses) does not apply to the
construction of this section.

--
Sue

Thanks Sue but if this is the right act...
http://www.opsi.gov.uk/ACTS/acts1990/Ukpga_19900009_en_1.htm

I can only find the paragraph you quoted in subsecton 67 and that appears to
relate to listed buildings not conservation areas....

67.-(1) This section applies where an application for planning permission
for any development of land is made to a local planning authority and the
development would, in the opinion of the authority, affect the setting of a
listed building.
<2-7 snip>
(Cool Subsection (3) of section 63 of the principal Act (references to
applications for planning permission to include applications for permission
to retain existing works and uses) does not apply to the construction of
this section.
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Palindr☻me
electronics forum addict


Joined: 10 May 2005
Posts: 76

PostPosted: Sat Jun 24, 2006 4:33 pm    Post subject: Re: 8yr old Satellite dish planninig permission madness Reply with quote

CWatters wrote:
Quote:
"Palindr?me" <me9@privacy.net> wrote in message
news:129q0tbr9oi2le6@corp.supernews.com...

CWatters wrote:

"Peter Crosland" <g6jns@yahoo.co.uk> wrote in message
news:449c554c$0$955$ed2619ec@ptn-nntp-reader01.plus.net...


I believe she should apply for a "certificate of lawfulness" on the
grounds that the "unauthorised structure" has been there for more
than four years.

Not in a conservation area. The rules are different.



Thanks for that. I've not been able to find anything on the web that

says

the four year rule doesn't apply in a conservation area. Can you expand

a

bit?



Planning (Listed Buildings and Conservation Areas) Act 1990
...

2) Subsection (3) of section 63 of the principal Act (references to
applications for planning permission to include applications for
permission to retain existing works and uses) does not apply to the
construction of this section.

--
Sue


Thanks Sue but if this is the right act...
http://www.opsi.gov.uk/ACTS/acts1990/Ukpga_19900009_en_1.htm

I can only find the paragraph you quoted in subsecton 67 and that appears to
relate to listed buildings not conservation areas....

67.-(1) This section applies where an application for planning permission
for any development of land is made to a local planning authority and the
development would, in the opinion of the authority, affect the setting of a
listed building.
2-7 snip
(Cool Subsection (3) of section 63 of the principal Act (references to
applications for planning permission to include applications for permission
to retain existing works and uses) does not apply to the construction of
this section.




Section 67 deals with listed buildings in this respect, section 73 of
"General Duties of Planning Authority." deals with conservation areas,
and says as much. The principal act being the Town and Country Planning
Act 1990.

In any event, there is no automatic right to the approval of a
certificate of lawfulness - there is only provision for a request for
certification based on the time that has elapsed. The decision still
rests with the Planning Authority.

I do strongly endorse the views expressed by others - far better to
negotiate what will be allowed than fight this one. They may be entirely
mistaken about the size, colour, location and visibility of this dish.
They may allow it to stay, subject to a splash of paint. They may just
want it moved a little away from the front aspect. If it can't be put
elsewhere, they may easily not be aware of that. Caradon Planning has a
reputation for a much more flexible attitude than its neighbour, my
planning body, Dartmoor National Park..


I do have a certain sympathy with them - dishes and aerials are best
kept out of sight. The Holy Land, with the skyline of its towns and
cities a mass of television aerials on poles, shows what lack of control
brings..

--
Sue
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CWatters
electronics forum Guru


Joined: 02 May 2005
Posts: 494

PostPosted: Sat Jun 24, 2006 7:08 pm    Post subject: Re: 8yr old Satellite dish planninig permission madness Reply with quote

"Palindr?me" <me9@privacy.net> wrote in message
news:129qqat47gk1692@corp.supernews.com...
Quote:
I do have a certain sympathy with them - dishes and aerials are best
kept out of sight. The Holy Land, with the skyline of its towns and
cities a mass of television aerials on poles, shows what lack of control
brings..

Hi Sue,

Thanks for all the good info. I agree with you that compromise is the best
route - it's just nice to know sometimes if you are negotiating from a
position of strength.. Looks like the OP is out of luck this time.

In my case I'm going to have to find a way to hide a sat dish in a paddock
as there are too many trees in the line of site nearer the house.

Colin
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jasen
electronics forum Guru Wannabe


Joined: 18 Jun 2006
Posts: 204

PostPosted: Wed Jul 05, 2006 8:42 pm    Post subject: Re: Looking for a simple circuit to demux/split/de-linterlace NTSC video signals Reply with quote

On 2006-07-05, <PigVideo@bellsouth.net> <PigVideo@bellsouth.net> wrote:
Quote:
Subject: Looking for a simple circuit to demux/split/de-linterlace
NTSC video signals

That's a complex task, but there are chips out there that can do it.

Bye.
Jasen
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JeffM
electronics forum Guru


Joined: 02 May 2005
Posts: 1007

PostPosted: Thu Jul 06, 2006 9:05 pm    Post subject: Re: Identifying parts Reply with quote

Quote:
I put a jpg here:
http://www3.sympatico.ca/lerameur/
:(http://www3.sympatico.ca/lerameur/PDR_0291.JPG)
Ken O

You need to learn how to use some graphics software.

This didn't need to be a 967kB file.
http://www.irfanview.com/
..
..
Quote:
I have several part here, I think they are resistors,
but the color used are confusing.

http://www.logwell.com/tech/components/resistor_values.html

http://www.electrician2.com/resist_calc/resist_calc.htm
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Wolfgang Schrader
electronics forum beginner


Joined: 13 Jul 2006
Posts: 1

PostPosted: Thu Jul 13, 2006 7:09 am    Post subject: Re: Controlling a relay via cellular phone..... Reply with quote

EsDee schrieb:
Quote:
Hello,

Since a few weeks I am running a webcamserver . It is stationed 40
Kilometers away. I control it via an UltraVNC connection. However, about 2
times a week I need to hard-reset the computer manually.


You need this:


http://www.antrax.de/de/switchbox-gsm.html



Wolfgang
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Tom Lucas
electronics forum beginner


Joined: 03 Apr 2006
Posts: 5

PostPosted: Thu Jul 13, 2006 10:15 am    Post subject: Re: 5 volt supply straight from 240v AC mains Reply with quote

"techie_alison" <retro@dial.pipex.com> wrote in message
news:n9CdnRSafcwThCvZnZ2dnUVZ8tCdnZ2d@bt.com...
Quote:
Hi,

Please may I ask what the arrangement is when you see a single LED
powered
straight off of a mains power supply without any transformers or
switch mode
circuitry? In other words, totally uninsulated or regulated.

I think you'll find that that is a neon lamp and not an LED. LED's
connected directly across the mains will give light in the form of fire.

Quote:
I have an old computer with an external hard disk which needs about 30
seconds to spin-up before the computer. With a small timing circuit,
555,
or using a PIC even (have dozens) after a set time a relay would be
set,
thus powering on the computer. A 7805 could be introduced to take
into
account the voltage swing. Half wave rectification could result in
120v
too.

Why not buy a 5V supply to run the electonics off rather than mess with
mains yourself?

Quote:
This doesn't need to be insulated from the outside world, safety is
not a
concern, just that roughly 5v should be available for the small
circuit and
the 3amp relay.

SAFETY IS THE PRIMARY CONCERN! Mains is not something to be fooled with
or it WILL kill you. Insulate everything or when you (or somebody else)
is not at full concentration you will touch something and die. There
should be fuses and other protection in the circuit as well. This is why
you should seriously think about buying a supply and letting someone
else handle the high voltage design - and the legal concerns that go
with it.

Quote:
Any ideas?? Just interested to hear of how this is done. Or would it
be
easier to just buy a small tordial TX and make the box a bit bigger?

If it were me then I would use 5V from the Hard drives supply to trigger
a PIC (but a 555 or an RC circuit would be just as good) to control the
PC's power switch. If the PC has an ATX supply, then great because you
can stay low voltage and use a simple relay to replace the PC power
switch (remembering that only a pulse is required to simulate a buton
press). If the PC supply is AT then the power switch is mains and you
could use a mains relay switched by 5V but you need to be sure that the
terminals are properly insulated on the mains side.

Seriously, your tone doesn't sound like you are giving mains electricity
the respect it needs. I know enough people who have died from electric
shocks and each time it was because they thought safety wasn't a
concern. Be careful.
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Mark Fortune
electronics forum addict


Joined: 06 Jul 2006
Posts: 57

PostPosted: Thu Jul 13, 2006 3:58 pm    Post subject: Re: 5 volt supply straight from 240v AC mains Reply with quote

techie_alison wrote:
Quote:
Hi,

Please may I ask what the arrangement is when you see a single LED powered
straight off of a mains power supply without any transformers or switch mode
circuitry? In other words, totally uninsulated or regulated.


If memory serves, I have seen this done once with an LED using a pair of
resistors as a voltage divider - it might have even just been the one
resistor. Personally I think it was cheap workmanship though. This will
work with an LED, although it will flicker as it's only illuminated for
less than half the time, I think it can work with only one resistor but
only when you know the resistance of the device it is powering.
For hard disks this is a non option - as thier resistance varies wildly
as it spins up, settles, and does all its internals stuff, and the
resistors would have to be big mothers as hard disks draw a hefty
current. No no no no no

Quote:
I have an old computer with an external hard disk which needs about 30
seconds to spin-up before the computer.

forgive me if I seem a little dense here... but if it's an external hard
disk, does it not have its own regulated power supply? could this not be
utilised in some fashion? but what sort of interface is it? ide, scsi,
parallel? that might give us some clues as to what would be a good solution.

Quote:
With a small timing circuit, 555,
or using a PIC even (have dozens) after a set time a relay would be set,
thus powering on the computer. A 7805 could be introduced to take into
account the voltage swing. Half wave rectification could result in 120v
too.

This doesn't need to be insulated from the outside world, safety is not a
concern,

safety is always a concern.

Quote:
just that roughly 5v should be available for the small circuit and
the 3amp relay.


I need a bit more information on your set up really, but I can envisage
two possible scenarios:

scenario 1) you have a true external hard disk, in an external hard disk
caddy with all the wiring and gubbins and some sort of parallel
interface whotnot. The drive is powered independantly of the computer.
If this is the case I would utilise the regulated 5v line powering the
hard disk

however, I think scenario 2 is more likely:

scenario 2) You have a hard disk that is external of the computer -
connected via an IDE lead and the computers power supply. You need the
hard disk to power up before the computer - although I dont know why at
this stage, but i'll pretend for now there is good reason for it. If
this is the case, you NEED a good regulated power supply for the drive,
and not just the 5v line if its a 3.5" drive - 12v will be required as
well or it wont spin up. 2.5" disks generally only require the 5v line.
Your best bet is a regulated 5v/12v power supply - which should be
fairly simple to construct. then simply run the timer circuit off that
supply.
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