Re: [Hampshire] OT: TRIAC circuit question

2009-06-23 Thread Bond, Peter
 There's probably some reason it's difficult to find a circuit for
this,
 but the annoying thing about having so little knowledge is that it's
 easy to imagine the circuit must be simple  :-)

Well, this first one is a lighting controller - but it is a
zero-crossing one, although there is a caveat about inductive loads
requiring a nicer sine.

http://www.ubasics.com/adam/electronics/doc/phasecon.shtml 

http://www.geocities.com/budb3/arts/eltron/motcntrl.html 

http://www.st.com/stonline/books/pdf/docs/3566.pdf 

Afraid I've forgotten the intended application...!

Peter
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[Hampshire] OT:Fwd: Mark Thompson on Media Show on R4 about FM switch off

2009-06-23 Thread trotter

Some interesting stuff about FM turn off.


Apologies for not sending a newsletter for a 
long time, but as you'll no doubt have heard the 
BBC bullies are trying to force DAB upon us (the 
BBC lobbied the Government to set an early FM 
switch-off date, so the Government merely did 
what the BBC recommended, so the BBC is to 
blame, IMO), so I think now would be a good time 
to start sending newsletters again.


*** Mark Thompson to appear on The Media Show on 
R4 tomorrow re FM switch-off ***

BBC Director-General Mark Thompson is appearing 
on The Media Show tomorrow at 1.30pm where he 
will apparently be answering questions about FM 
switch off. So if you're not overly ecstatic 
about the decision to inflict low audio quality 
on the entire population via DAB, you can send 
your views to The Media Show via the following web contact form:

http://www.bbc.co.uk/radio4/features/the-media-show/contact/


*** Radio 4 Feedback asking for listeners' comments on FM switch-off ***

In the latest edition of Feedback on Radio 4, 
they also asked people to send their views about the plans to switch off FM.

Feedback has continually ignored the fact that 
there's a problem with DAB's sound quality over 
the last few years, either because they don't 
realise that the poor audio quality is an 
entirely separate issue to that of having poor 
reception quality, or they've simply swallowed 
the BBC's dishonest spin on the subject. So now 
would be a good time to remind them that there is still a problem.

You can send your messages to Feedback via this web form:

http://www.bbc.co.uk/radio4/features/feedback/contact/


*** FM switch-off on You  Yours ***

If you're not already peed off about FM being 
switched off, the following recording of an 
interview with the chief exec of the DRDB 
(Digital Radio Development Bureau) Tony Moretta, 
promoting DAB and justifying why it's fine to 
switch off FM in 2015, will likely do the trick. 
His interview starts 34 mins 40 seconds into the programme on the iPlayer:

http://www.bbc.co.uk/iplayer/episode/b00l36gn/You_and_Yours_23_06_2009/

The DRDB is co-funded by the BBC, and the BBC's 
Director of Radio Tim Davie is the Vice Chair of 
the DRDB, yet this bloke seems to think that's 
it's perfectly acceptable to lie on Radio 4 to 
millions of listeners. For example, he claims 
that DAB+ only offers very, very slightly 
higher quality than DAB. That is simply a bare 
faced lie. And when asked whether the UK is 
using a less advanced system than the rest of 
Europe, the first thing he says is that that's 
an urban myth. Er, no, it seriously isn't an 
urban myth, it is a stone cold fact of life. It 
may be an uncomfortable truth for the DAB 
supporters, but that's no excuse to lie on Radio 
4, especially when the public are paying part of his wages.

Happy listening.


*** Save FM Campaign started ***

I'd also like to draw your attention to the new Save FM Campaign website:

http://www.savefm.org/

It's only just launched, so it only consists of 
the home page at the moment, but more content will be added soon.

The main aim of the campaign is to stop the BBC 
switching off its national FM stations, although 
it will also be campaigning for the BBC to 
switch from using DAB to DAB+ by the time FM is 
switched off if the BBC does intend to switch 
off its FM stations - by deinition the vast 
majority of digital radios would support DAB+ by 
then, so there is absolutely no justification to 
continue broadcasting using a 20-year old system 
- which would be around 30 years old by the time 
FM could be switched off (I don't think FM could 
be switched off until around 2020).

There is justifiably a lot of anger about the 
plans to switch off FM, mainly because the vast 
majority of people simply don't want it to 
happen as they're perfectly happy with FM, plus 
for a whole host of other reasons as well, 
obviously including the fact that DAB provides 
low audio quality. A few hundred people managed 
to stop the BBC switching off its Radio 4 Long 
Wave station, so given the number of listeners 
who would be opposed to the BBC switching off 
its national FM stations, hopefully it will be 
possible to convince the BBC to leave its national FM stations broadcasting.

The FM stations only cost around £10 million per 
annum to transmit, which is a small fraction of 
what it will cost to broadcast DAB nationally, 
and it's only 22 pence per adult per year, or 
0.28% of the BBC's £3,600m annual revenue from 
the licence-fee. £10m per annum may be a big 
number when taken on its own, but it's peanuts to the BBC.


*** BBC's live Internet radio streams at higher quality than DAB  DAB+ ***

And finally, some good news. The BBC has finally 
launched its live AAC Internet radio streams, 
and it using 192 kbps AAC for Radio 3 and 128 
kbps AAC for the other stereo streams. The same 
bit rates are being used for on-demand streams as for the live streams.

It's also possible to say that these streams