Driver to drive?

[ChrisGibboGibson]

kensmith wrote:

In article <20041028211649.25170.00003294@mb-m04.aol.com>,
ChrisGibboGibson <chrisgibbogibson@aol.com> wrote:
chickenwing2010 wrote:

Dear All,

I'm investigating how a PFM signal can be converted into PWM signal by
hardware. Any suggestions would be very appreciated.


Sounds like homework but what the hell...

Signal into a monostable, LP filter it, remodulate it to PWM using a
comparator
and triangle waveform.


Or, use a PIC.

Yes, or use a PIC.

I don't know if that was meant as a joke in view of another failed thread that
I started tonight, but either way it made me laugh.

Gibbo

 

[ChrisGibboGibson]

kensmith wrote:

In article <20041028214408.18151.00005456@mb-m03.aol.com>,
ChrisGibboGibson <chrisgibbogibson@aol.com> wrote:
kensmith wrote:

In article <20041028211649.25170.00003294@mb-m04.aol.com>,
ChrisGibboGibson <chrisgibbogibson@aol.com> wrote:
chickenwing2010 wrote:

Dear All,

I'm investigating how a PFM signal can be converted into PWM signal by
hardware. Any suggestions would be very appreciated.


Sounds like homework but what the hell...

Signal into a monostable, LP filter it, remodulate it to PWM using a
comparator
and triangle waveform.


Or, use a PIC.


Yes, or use a PIC.

I don't know if that was meant as a joke in view of another failed thread
that
I started tonight, but either way it made me laugh.

Hint:

OBAOL: Me to!

I'm still in the dark.

First I asumed OBAOL was a cryptic message. Then I wondered if it was a
reference to AOL because I happen to post from AOL (I can use something else if
it gives better credibility - but my 6 year old daughter likes it as it's easy
to use - which is probably why I use it). But, alas, I can not decipher it.

Perhaps I need a board full of PICs, a few FPGAs, some exotic VHDL software and
the latest ultra low power, super exotic, resistors in order to decode it.

Not forgetting some Spice software (that never seems to agree with reality).

Gibbo

 

[Ken Smith]

In article <20041028211649.25170.00003294@mb-m04.aol.com>,
ChrisGibboGibson <chrisgibbogibson@aol.com> wrote:

chickenwing2010 wrote:

Dear All,

I'm investigating how a PFM signal can be converted into PWM signal by
hardware. Any suggestions would be very appreciated.


Sounds like homework but what the hell...

Signal into a monostable, LP filter it, remodulate it to PWM using a comparator
and triangle waveform.

Or, use a PIC.

--
--
kensmith@rahul.net forging knowledge

 

[Ken Smith]

In article <20041028214408.18151.00005456@mb-m03.aol.com>,
ChrisGibboGibson <chrisgibbogibson@aol.com> wrote:

kensmith wrote:

In article <20041028211649.25170.00003294@mb-m04.aol.com>,
ChrisGibboGibson <chrisgibbogibson@aol.com> wrote:
chickenwing2010 wrote:

Dear All,

I'm investigating how a PFM signal can be converted into PWM signal by
hardware. Any suggestions would be very appreciated.


Sounds like homework but what the hell...

Signal into a monostable, LP filter it, remodulate it to PWM using a
comparator
and triangle waveform.


Or, use a PIC.


Yes, or use a PIC.

I don't know if that was meant as a joke in view of another failed thread that
I started tonight, but either way it made me laugh.

Hint:

OBAOL: Me to!

--
--
kensmith@rahul.net forging knowledge

 

[john jardine]

"ChrisGibboGibson" <chrisgibbogibson@aol.com> wrote in message
news:20041028204940.25170.00003288@mb-m04.aol.com...

Well.... as there are clearly some people on this NG who *really* know
their
stuff (and we all know plenty within our own field) perhaps a solution
might be
to add a moderator to this group to get rid of all the shite (ie political
fuckbollockswank) that many people aren't interested in.

Gibbo

I only occasionally look in but uk.local.yorkshire over a period became
totally infested with pillocks and dickheads. The real users recently moved
across to uk.local.yorkshire.moderated, and sanity returned.
I'd say though that this electronics group needs to travel a long, long way
to reach the same point.
regards
john

 

[ChrisGibboGibson]

"john jardine" wrote:

"ChrisGibboGibson" <chrisgibbogibson@aol.com> wrote in message
news:20041028204940.25170.00003288@mb-m04.aol.com...
Well.... as there are clearly some people on this NG who *really* know
their
stuff (and we all know plenty within our own field) perhaps a solution
might be
to add a moderator to this group to get rid of all the shite (ie political
fuckbollockswank) that many people aren't interested in.

Gibbo

I only occasionally look in but uk.local.yorkshire over a period became
totally infested with pillocks and dickheads. The real users recently moved
across to uk.local.yorkshire.moderated, and sanity returned.
I'd say though that this electronics group needs to travel a long, long way
to reach the same point.
regards
john

At present I think that's probably true. It's quite good at present.

2 years ago I would have diasagreed totally. It was ridiculous. Nothing but
one-up-man-ship and arguments.

Too many were trying *so* hard to show their expertise that the thread got
totally lost and nothing ever got answered. That excess seems to have died.
Things do actually get answered now.

Obviously threads get diverted. That's no different than normal conversation.

But that political shit? Fuck that.

Gibbo

 

[john jardine]

"ChrisGibboGibson" <chrisgibbogibson@aol.com> wrote in message
news:20041028220312.18151.00005459@mb-m03.aol.com...

"john jardine" wrote:
[clip]


Obviously threads get diverted. That's no different than normal
conversation.

But that political shit? Fuck that.

Gibbo

It seems uniquely some aspect or tradition within American society. I've
seen nowt from elsewhere and not being American I can only sit on the
sideline and watch. Whereas I can go into a pub in the UK and have an
enjoyable person to person, mouth frothing political argument, 'appen the
Americans because of the size of their country, have not this ease of
personal contact and tend to make use of available opportunities. 'Appen
regards
john

 

[nospam]

"Steve" <aeroman10@yahoo.com> wrote:

My group and I built the following dc motor control circut:
http://forum.webzila.com/index.php?act=Attach&type=post&id=2441

With power supply set to 12V, we just measured to voltage going to the
motor and it says 1.5V .... what is wrong?

The circuit diagram is wrong, and so is what you built if you followed it.

Swap Q3 with Q4 and Q5 with Q6. The emitters of Q3 and Q4 should be
connected and drive one side of the motor, Q5 and Q6 similarly driving the
other.

 

[ChrisGibboGibson]

"john jardine" wrote:

"ChrisGibboGibson" <chrisgibbogibson@aol.com> wrote in message
news:20041028220312.18151.00005459@mb-m03.aol.com...
"john jardine" wrote:
[clip]


Obviously threads get diverted. That's no different than normal
conversation.

But that political shit? Fuck that.

Gibbo

It seems uniquely some aspect or tradition within American society. I've
seen nowt from elsewhere and not being American I can only sit on the
sideline and watch. Whereas I can go into a pub in the UK and have an
enjoyable person to person, mouth frothing political argument, 'appen the
Americans because of the size of their country, have not this ease of
personal contact and tend to make use of available opportunities. 'Appen
regards
john

Yer bluddy northerner.

Reminds me of summat mi grandad use fo' say...

"'appen as like as not for them's that can as will"

I still have no clue what the hell he was talking about.

Gibbo

 

[steamer]

--Howzabout adapting the mechanism in an electric stapler? They
really whack pretty good and it's just a solenoid...

--
"Steamboat Ed" Haas : Just another fart in
Hacking the Trailing Edge! : the Elevator of Life...
http://www.nmpproducts.com/intro.htm
---Decks a-wash in a sea of words---

 

[Michael]

Joerg wrote:
SNIP

Well, I don't know which was first or is better, WWVB or DCF77.
Sometimes our stuff wins, sometimes theirs. All I know is that the
European version is not so limited to sync at night but that won't make
much of a difference in real applications.
SNIP
Regards, Joerg

http://www.analogconsultants.com

WWVB signal isn't necessarily limited to usability at night. Like real
estate agents say, it's location, location, location. I live in NY
State, and I've seen my several different WWVB clocks set themselves in
the morning, in the afternoon .... just about any time. A couple months
ago I bicycled over to a friend's house in mid-afternoon with my WWVB
travel alarm clock to evangelize (he wasn't familiar with the
technology). On a whim I pulled the battery, popped it back in, and was
delighted to see the little sucker pulling in a strong signal After 3
minutes or so, it set itself. On the other hand, a guy who lives about
10 miles from me transfers his WWVB clock from livingroom to near a
bedroom window every once in a while so it will synch.

 

[Max Hauser]

"john jardine" in news:cls7kk$ga8$1@news8.svr.pol.co.uk...

I only occasionally look in but uk.local.yorkshire over a
period became totally infested with pillocks and dickheads.
The real users recently moved across to
uk.local.yorkshire.moderated, and sanity returned.
I'd say though that this electronics group needs to travel
a long, long way to reach the same point.

I believe you will see that you really mean it needs to _go back_ a long,
long way, to its roots.

In the old days there was the newsgroup net.analog, for example, where
analog electronics hung out. If people wanted to flame, they went to
net.flame.

That electronic outhouse disappeared in the Great Renaming at the end of
1986, after a seminal clash of visions. (And what happens when the
outhouse disappears? What piles up? That decision may one day be seen as
the beginning of the end of Western civilization.) Anyway, as one technical
person locally pointed out, the "technical" newsgroups have the most junk of
all, nowadays.

 

[xray]

On 26 Oct 2004 08:35:11 -0700, jdurban@vorel.com (Product developer)
wrote:

Why is the U.N. nuclear agency suddenly warning now that insurgents in
Iraq may have obtained nearly 400 tons of missing explosives -- in
early 2003?

I guess many have already heard about this information from reporters
that were with US troups in the early part of the war.
http://kstp.com/?tf=Contact5_Read.tpl

I could never get a working video link from the site above, and the one
below is confusing, but eventually I clicked the right stuff to get a
CNN interview based on the KSTP video.
http://www.shadowtv.com/redirect/notification.jsp?vid=67d7453c28fb633a41ce0fd247c7fac9

Hope you can sort out the sloppy linkage above to get to the meat.

 

[Ric]

Frithiof Andreas Jensen <frithiof.jensen@diespammerdie.jensen.tdcadsl.dk> wrote:

"Joel Kolstad" <JKolstad71HatesSpam@Yahoo.Com> skrev i en meddelelse
news:M46dnUI1-sgHhRzcRVn-qQ@comcast.com...

What encoding is used for non-English languages?

good question - the answer to which would be in one of the ITU standards
that I used to be bored to tears reading ;-)

There used to be a free, as in gratis, archive of GSM standards on the net
but I have forgotten the link. It can be dredged up, but not before Monday.

http://www.3gpp.org/specs/specs.htm


--
Rick

 

[Terry Pinnell]

chrisgibbogibson@aol.com (ChrisGibboGibson) wrote:

Paul Burridge wrote:


On 28 Oct 2004 23:33:29 GMT, chrisgibbogibson@aol.com
(ChrisGibboGibson) wrote:


The AC127 was bought surplus and had to be repainted to stop it being a
phototransistor. Or was that an OC44? t'was all such a long time ago.

Could it have been these?


http://cgi.ebay.co.uk/ws/eBayISAPI.dll?ViewItem&category=36332&item=22795
87093&rd=1


Almost brought a tear to my eye!

For one brief moment I thought you'd put up a link to the "ladybird book of "
radio or electronics (whichever it was).

I'd have bid 25 quid for it.

Gibbo

You'll get some change if I'm right and the book was 'Making A
Transistor Radio'.

# 9.
Making A Transistor Radio - A Ladybird 'How to make it' Book
Dobbs, G C, Illustrated by Robinson, B H

Price: Ł 4.99

Book Description: Loughborough, England: Wills & Hepworth, 1972. Hard
Cover. Ladybird Book. Ladybird Series 724 - Hard to find title from
the 'How to make it' series. Near fine condition genuine first edition
(original price 15p net / Tally 320 / no other titles listed). Clean,
bright and tight, not inscribed. Hard to find first edition and in
such lovely condition. Bookseller Inventory #001101

Bookseller: S J Partridge (Halstead, ESS, United Kingdom)

====================

# 20.
Making a Transistor Radio
DOBBS, G.C., Illustrated by B.H. ROBINSON

Price: Ł 9.02 [Convert Currency]
Shipping: [Rates and Speeds]

Book Description: Loughboough, UK: Ladybird Books, 1972. Pictorial
Card Cover. Near Fine/No Jacket. First. 12mo - over 6ž" - 7ž" tall. No
inscription. 52 pp. Full colour illus. Wiring diagrams. Step-by-step
guide to making a transistor radios. Starting with a crystal set.
Minor spine wear. Full list of components needed. (Ask for a scanned
image). Bookseller Inventory #002153

Bookseller: Hartley's Books (Auckland, ., New Zealand)

====================

The above were amongst the secondhand Ladybird offers at Abebooks:
http://www.abebooks.co.uk/servlet/SearchResults?bx=on&sts=t&ds=30&bi=0&kn=ladybird+AND+radio&sortby=3

Or use http://tinyurl.com/6motp

--
Terry Pinnell
Hobbyist, West Sussex, UK

 

[Terry Pinnell]

chrisgibbogibson@aol.com (ChrisGibboGibson) wrote:

We'll get a question such as.....

"I need to record the sound from some suffering, half dead, birds twittering in
the back garden, I can't use a tape recorder or sound card in a PC because
there's a magnetic field from a nuclear reactor right next door which
interferes with all the electronics.

I'm a plumber by trade and have no knowledge or abilities whatsoever with
electronic construction, design, software programming, computers or even
wiring. I can't even wire a plug up.

That's a relatively *thorough* spec! It's rare to get much indication
of skill level, so respondents risk baffling or boring.

--
Terry Pinnell
Hobbyist, West Sussex, UK

 

[Paul Burke]

john jardine wrote:

I only occasionally look in but uk.local.yorkshire over a period became
totally infested with pillocks and dickheads.

What do you expect, they are wrong side o'th'hills.

The real users recently moved
across to uk.local.yorkshire.moderated, and sanity returned.

I used to subscribe to various archaeological NGs, notably
sci.archaeology and sci.archaeology.moderated. The difference was
remarkable- the unmoderated group was awash with pet-theorists,
archaeoastrologers and mutual abuse. The moderated group? Lucky to get
two posts a day.

I'd say though that this electronics group needs to travel a long, long way
to reach the same point.

What, sanity or Yorkshire?

Paul Burke

 

[Paul Burke]

ChrisGibboGibson wrote:

"'appen as like as not for them's that can as will"

That's neether micklin nor mucklin. But as my Granny used to say, "It'll
eether rain or go dark before mornin'".

Where there's no sense, there's no feeling.

Paul Burke

 

[Robert Baer]

terry wrote:

Hi,

Anyone could teach me the following?

1. What is the advantage of using metal capacitors?

2. I also want to know the range of values of metal capacitors.

Thanks!

To make a capacitor, use two conductive parallel plates seperated by
an insulator.
For minimum loss, especially as frequency goes up, the conductors
should have as low ersistivity as practical - this translates to use of
metals, usually aluminum in practice due to the low cost.
Insulators can be vacuum, air, mylar, ceramic, glass, etc.

What do you mean by "metal capacitors" anyway?

 

[Alan Peake]

I plan to build a superregen to play with. After I get one going, I think I
will try to make it work at 450 MHz. Like some other posters here, I built
my previous regen 40 years ago.

Cheers,
John

Hi John,
I built a few superregens about 40 years ago too!! They were on 288
MHz when Australian amateurs had the one metre band. Surprisingly good
sensitivity for a one-valve receiver (6J6 usually) but of course they
put out a fair bit of rubbish over a fair bit of the band. I often
wonder if the quench frequency could be better controlled - perhaps an
external injection oscillator or something like that. Anyway, best of
luck with your 450 MHz.
Alan
VK2TWB