PRC as a amplifier in GPS question.

[Jordan]

John G wrote:

The thing they have going for them is that they flash at the legally
required rate 60-120 flashes per minute and they change rate when a lamp
fails (also legally required) indicating to the observant driver that
something is amiss.

You will need a 6 volt version because as you already know the current
is double for the same light output on 6volt systems. Incandescent lamps
should be 18 - 21 watts.

That's another feature I'd like to have in an electronic blinker can.
It's the lack of observant drivers that's convincing me I need blinkers!
Haven't seen any 6V, 18-21W bulbs - do they exist?

Thanks
Jordan

 

[Nicholas Sherlock]

David Segall wrote:
[...]

The Flash is not the problem since
automatic call back works if I use the phone to key in the *37# and
press dial.

Yes, but you are hanging up with the phone then picking up again before
dialling, aren't you? This is what the flash *is*.

Cheers,
Nicholas Sherlock

 

[Ken Taylor]

Jordan wrote:

Ken Taylor wrote:


No circuits? Are you kidding? Search for '555 astable' and if you want to
narrow it down more add '50%' to the search terms. Use the output of the
astable to drive a MOSFET or relay to drive the lights.


Is it OK to have the 555 powered up all the time?
I'd prefer if it only got power when the blinker switch is activated.
It's refinements like this that I was hoping to find.

Thanks
Jordan

You *could* have the 555 powered all the time, but why not use the
switch to apply power to the 555 and the relay/MOSFET/lamps? I don't see
the problem.

Cheers.

Ken

 

[Jordan]

Ken Taylor wrote:

You *could* have the 555 powered all the time, but why not use the
switch to apply power to the 555 and the relay/MOSFET/lamps? I don't see
the problem.

Yes, that's what I've figured out, using the blinker switch, but need to
use two 555's unless someone shows me how to do it with one.
The only problem is that I'm no electronics whiz!

Thanks
Jordan

 

[Phil Allison]

"quietguy" = top posting , non quoting wanker

Phil Allison wrote:

** What the HELL are you doing with your newsreader ??

The above quotes no poster by name, has no context, looks like it is
itself
a quote and moreover reads like a dumb troll.

Maybe "confidential counselling " is just what YOU need.

......... Phil


Well gee Phil, seems like you are getting your little knickers in a knot
again
- but I guess you just forgot to read the heading of the post I replied
to -

** It is not possible to know what post you replied to as you did not QUOTE
any of it !!

Flys in the face of basic usenet etiquette.

if
you read that really really carefully my post makes lots of sense,

** Never said it was nonsense - I said it was a TROLL.

When you post UNDER people's actual words such misconstructions are
avoided.

well at
least to those with common sense and good manners.

** Leaves YOU out - doesn't it ?

Do try to be nice Phil - it doesn't hurt and you wouldn't make such an
idiot of
yourself

** When you post UNDER people's words and about the thoughts expressed
therein such misconstructions are avoided.

David - who really doesn't care what Phil writes

** Err - David - who really does not care about anything much at all.


BTW

Screwed any of you tenants lately ??



............ Phil

 

[Trevor Wilson]

"mark jb" <nukeleer at internode dot on dot net> wrote in message
news:4396264b$1@duster.adelaide.on.net...

Looking through this unit it looks like a black and white CRT picture
but if you take the eyepiece off there is a small square white screen
about 1x1 cm across. Anyone know if this is indeed a CRT and if
so how small can you make the little buggers?

I would very much doubt it's a CRT.

**You'd be wrong. CRTs were very common in old video cameras. In fact, they
were prized above early LCDs, since they provided far better deatil, albeit
in monchrome.

Probably a B&W LCD with a variable focus lens for those who need to wear
specs.

**Nope.


--
Trevor Wilson
www.rageaudio.com.au

 

[quietguy]

Just the female ones Phil - I can save their pets for you if you ask me nicely

David - who wonders how Phil ever gets his knickers unknotted

Phil Allison wrote:

BTW

Screwed any of you tenants lately ??

........... Phil

 

[John]

mark jb wrote:

Looking through this unit it looks like a black and white CRT picture
but if you take the eyepiece off there is a small square white screen
about 1x1 cm across. Anyone know if this is indeed a CRT and if
so how small can you make the little buggers?

I would very much doubt it's a CRT.
Probably a B&W LCD with a variable focus lens for those who need to wear
specs.

Good luck with the fixing, though. If you do have to rip it apart to get to
the screen, might as well have a crack at fixing the mechanism (if you can
be bothered)

Fixing?
That wasn't really my intention. I was only interested more out of curiosity
as to what was inside then fixing it. The parts in the mechanism are very
tiny and hard to see and I'd more then likely lose them .

I have had to say bye bye to that side of my electronics hobby. I am finding
the parts way too tiny most of the time even in kits to do anything with and
its been hard to say bye bye to this..

 

[Jasen Betts]

On 2005-12-06, Ken Taylor <ken123@xxxxtra.co.nz> wrote:

Jordan wrote:


Ken Taylor wrote:


No circuits? Are you kidding? Search for '555 astable' and if you want to
narrow it down more add '50%' to the search terms. Use the output of the
astable to drive a MOSFET or relay to drive the lights.


Is it OK to have the 555 powered up all the time?
I'd prefer if it only got power when the blinker switch is activated.
It's refinements like this that I was hoping to find.

Thanks
Jordan

You *could* have the 555 powered all the time, but why not use the
switch to apply power to the 555 and the relay/MOSFET/lamps? I don't see
the problem.

a typical indicator switch is spdt centre off.
that's the problem

--

Bye.
Jasen

 

[Franc Zabkar]

On Tue, 6 Dec 2005 20:19:23 +1100, "John G" <Greentest@ozemail.com.au>
put finger to keyboard and composed:

"The Real Andy" <will_get_back_to_you_on_This@> wrote in message
news:3niap15i6iho3p50kqujttfb07v73d1po8@4ax.com...
On Tue, 6 Dec 2005 16:37:23 +1000, "Dand" <dand@dand.net.au> wrote:

There are simple ways, if you know electronics.

An inverter with a resistor across the input and output and a
capacitor from
ground to input will oscillate at the output as long as the inverter
has
some hysstatsis. If you use 2 resisters and a transistor as the
inverter
(pnp emitter ground, two resistors to source from the collector,
output
between the resistors, it should work ok.

Of you could just get a 555..... google it and you should hit about 10
billion 555 circuits
I need to put a turn indicator blinker system on my 6 Volt vehicle.
I'm looking for a circuit to provide the timed flashing, maybe using
a 555
IC.
Thought there'd be lots to find, but no. Any reason a 555 can't be
used?
Anyone know of a suitable circuit?
I want to avoid electro-mechanical flasher cans.


There is a 555 variant specifically targetet at automotive use, cant
remember it off the top of my head, but it exists. Personally, if I
were you, i would head down to my local supercheap (or similar auto
store) and by a generic electronic flasher. It will more that likely
work and if it doesn't it wont be hard to modify. I would be surprised
if you could not find one targeted for 6V.

BTW, what is wrong with a electro-mech flasher? They have been in use
for a very long time, and still are. They must have something going
for them.

The thing they have going for them is that they flash at the legally
required rate 60-120 flashes per minute and they change rate when a lamp
fails (also legally required) indicating to the observant driver that
something is amiss.

You will need a 6 volt version because as you already know the current
is double for the same light output on 6volt systems. Incandescent lamps
should be 18 - 21 watts.

IIRC the flasher is also required to turn on as soon as the indicator
switch is activated. If so, then you can't just switch the output of a
free running oscillator.

-- Franc Zabkar

Please remove one 'i' from my address when replying by email.

 

[Jasen Betts]

On 2005-12-06, Jordan <jwprincic@optusnet.com.au> wrote:

Jasen Betts wrote:

the 555 may not be suited to the wiring layout.

most indicator flashers connect in series with the switch and only start
when the bulbs are connected. doing that with a 555 may not be so easy.


I think I've got part of the solution: Use two 555's (or a 556) so that
each is energised by the blinker switch, for either left or right.
Means some unconventional wiring, but that doesn't matter in this case.
Vehicle has no key - ignition is by magneto. So having the blinker
arranged this way saves introducing a switch, which I'd be likely to
forget to turn off.

you can't power up half a 556. making it work with a single chip (and
single mosfet etc) would make it more compact

a 555 might be the wrong solution.

an oscilator based around op-amps could sense the dark resistance and vary
the blink rate OTOH if he's using LED globes (or panels) they're not going


to fail suddenly. because each panel has multiple LEDs in parallel. so
variable blink rate isn't needed


hmmm, this one's compatible with standard wiring
and will only run when the lamps are switched on


+-------------+---------------------------+-->from
| | /| | indicator
| +---------(----[100K]-o< |--------+ | fuse
| | | \| | |
| | . . . .|. . . . | |
| | . VCC(8) . | |
| | . . | |
+---(---RES(4) OUT(3)-------------||--)---+
| . 555 . || |
+---TH(6) DIS(7)-- || |
| . . ||--+--->to switch
+---TR(2) CV(5)-- p-channel and lamps
| . . mosfet
--- . GND(1) .
10u~T~ . . . .|. . . .
| |
+---------+
|
----
////

the inverter could be made from the second half of a 556 etc...

the only problem is it starts off dark and iights up a short
time after the switch is turned on


this modification will have it light up immediately when it
turned on and then start blinking.

------+----
|
/|----(----------+
---------[100K]-o<1| | |
\|----(-------+ |
. . . . . | | |
. | | |
. | | |
OUT(3)------||----+ | |
. ||pch o-|--+----- left signal
. || |
. ||---o------ |
|
indicator o-+-------- right signal
switch

the Nor gate could be done with a couple of diodes, a pull-down
resistor and half a 556.


Bye.
Jasen

 

[bodgy]

Toshiba have an experimental 20" flat panel screen that has individual
CRT's for each pixel - still in R&D at the moment, though they've
shown it at one of the European Expos -- they hope it to be the
successor to Plasma - cheaper and less juice and better picture
contrast.

Colin

 

[Bob Parker]

I see you haven't moved since last time we were in contact, David!
Watch out for those rogue technicians who sabotage coffee mugs...

Bob


On Wed, 07 Dec 2005 11:56:18 GMT, quietguy
<quietguy@REMOVE-TO-REPLYconfidential-counselling.com> wrote:

...and you are so bigoted that you wouldn't have a relationship with an
aboriginal lady Dill? (whoops I meant to write Phil)

David - who likes (most) aboriginal people

Phil Allison wrote:


** So you like to get into the lubras out there in Kalgoorlie - eh David
?

One way of paying you the back rent, I suppose.

.......... Phil

 

[Jasen Betts]

On 2005-12-07, Jordan <jwprincic@optusnet.com.au> wrote:

Jasen Betts wrote:
On 2005-12-06, Jordan <jwprincic@optusnet.com.au> wrote:

Jasen Betts wrote:

the 555 may not be suited to the wiring layout.

most indicator flashers connect in series with the switch and only start
when the bulbs are connected. doing that with a 555 may not be so easy.


I think I've got part of the solution: Use two 555's (or a 556) so that
each is energised by the blinker switch, for either left or right.
Means some unconventional wiring, but that doesn't matter in this case.
Vehicle has no key - ignition is by magneto. So having the blinker
arranged this way saves introducing a switch, which I'd be likely to
forget to turn off.


you can't power up half a 556. making it work with a single chip (and
single mosfet etc) would make it more compact

a 555 might be the wrong solution.

an oscilator based around op-amps could sense the dark resistance and vary
the blink rate OTOH if he's using LED globes (or panels) they're not going


to fail suddenly. because each panel has multiple LEDs in parallel. so
variable blink rate isn't needed


hmmm, this one's compatible with standard wiring
and will only run when the lamps are switched on


+-------------+---------------------------+-->from
| | /| | indicator
| +---------(----[100K]-o< |--------+ | fuse
| | | \| | |
| | . . . .|. . . . | |
| | . VCC(8) . | |
| | . . | |
+---(---RES(4) OUT(3)-------------||--)---+
| . 555 . || |
+---TH(6) DIS(7)-- || |
| . . ||--+--->to switch
+---TR(2) CV(5)-- p-channel and lamps
| . . mosfet
--- . GND(1) .
10u~T~ . . . .|. . . .
| |
+---------+
|
----
////

the inverter could be made from the second half of a 556 etc...

the only problem is it starts off dark and iights up a short
time after the switch is turned on


this modification will have it light up immediately when it
turned on and then start blinking.

------+----
|
/|----(----------+
---------[100K]-o<1| | |
\|----(-------+ |
. . . . . | | |
. | | |
. | | |
OUT(3)------||----+ | |
. ||pch o-|--+----- left signal
. || |
. ||---o------ |
|
indicator o-+-------- right signal
switch

the Nor gate could be done with a couple of diodes, a pull-down
resistor and half a 556.


Bye.
Jasen

Thanks Jasen, that's all interesting but I'm scratching my head a bit.
Can you please explain the use of the inverter? Does the circuit "sleep"
until the blinker switch is activated?

yeah that was the idea. it's to get it to sleep

Also, how is a 555 (or half a 556) configured to act as an inverter?

connect reset to Vcc, threshold and trigger are connected together
and used as the input, out is a totem-pole output
and discharge an open collector output.
you get a sort of schmitt inverter.

I'm slightly more conversant with 555's than with op-amps etc, which is
the reason I'm using those.
What suggestion is there for a mosfet? I'm using what's at hand here -
some MTP3055V's, but these are I think overkill and only show 2.4V
instead of the 6V supply voltage. Would a smaller mosfet be likely to
saturate and supply the full voltage?

I don't know much about mosfets. but for a negative earth system (which
everyone has assumed without confirming) and switching the live current
(which is normal in automotive applications) P-Channel mosfets are best
suited. and the range is more limited.

if the MTP3055 has a P-channel brother that would be the one to use

the MTP3055 seems to be trading on the well known 2N3055 bipolar NPN
transistors number, and so on a whim entered the 3055's opposite number
"2955" into google

http://www.google.com/search?q=mtp2955+specifications

and even that doesn't look promising. I think you're going to need to use a
bipolar power transistor. maybe the afforementioned 2955 now available in
plastic... TIP2955, that's going to want a siveable base drive so maybe a
bd135 to do that (and also function as an inverter)

/
||/
|/~
+-[22R]-|
| |\
| | \
/ \
| / |
|/ | o-+-----
pin3 ----------+---| +----o---- |
| |\ 0-)--+--
+->|--+ | \| | |
| ~\ +--|<-+ |
| | | |
pin2-[100K]-+-------------(----[1K]--------+--|<----+
|
-----
/////

gotta go - more later.

--

Bye.
Jasen

 

[John G]

"Clifford Heath" <no.spam@please.net> wrote in message
news:43976594$0$25854$afc38c87@news.optusnet.com.au...

Franc Zabkar wrote:
IIRC the flasher is also required to turn on as soon as the indicator
switch is activated.

Have you got a reference for that? Because as noted, the
electro-mech ones don't generally do it. I know the one
in my car doesn't, and I'd like to fix that without having
to build my own. If flashers are now required to do it,
I'd have a reason to get a refund on one that didn't .

The other problem with most 555 circuits (and the inverter
circuit mentioned) is that the first half-cycle takes
noticeably longer. A flasher circuit shouldn't do that.
Any clever ideas about how to design this behaviour? Apart
from the obvious one of using dividers etc...

Clifford Heath.

I do not have a set of regs to help with that and am relying on memory
from a previous life.

It has come to my attention that the at least the old regs and I have no
reason to think it is changed,
An audible signal is required to remind the driver that the flasher is
still going and so any attempt to build a flasher from electronics will
require the extra components to make the noise.

In short the simple path is a commercial flasher which could likely be
obtained thru some vintage car club as there are people with garages
full of old stuff that turn up at club days to flog their wares.
--
John G

Wot's Your Real Problem?

 

[Jordan]

The Real Andy wrote:

If you cant figure out a 555, then perhaps you should go with the
local auto shop's 6 volt electro-mech version of flasher.

Thanks Andy.
6-volt flasher units can be bought, but only from specialists now.
Supercheap Auto don't have them. etc etc

Jordan

 

[Wayne]

Someone broke their crayon this morning.

 

[^Temuchin^]

Ken Taylor wrote:

"George Orwell" <nobody@mixmaster.it> wrote in message
news:dd2d50a5fef64238f3be18e4b5b23d37@mixmaster.it...
Does Jean-Paul Turcaud like bumsex?

You can ask if you're keen.

I thought he did just ask

 

[Ken Taylor]

"George Orwell" <nobody@mixmaster.it> wrote in message
news:dd2d50a5fef64238f3be18e4b5b23d37@mixmaster.it...

Does Jean-Paul Turcaud like bumsex?

You can ask if you're keen.

 

[Jean-Paul Turcaud]

Please note the only type of Official thanks one can expect from the Land of
Bastards, after 35 years of exploitation by the australian Toads of the
Great Sandy Desert Discoveries ! ...and from one great, gallant & generous
Mining Pioneer that australian manure at large has run to the gutter !

I have said Official Thanks on purpose, since that Sunny Gutless Filth, and
Son of an Anglican Bitch indeed, is a paid employee of NEWCREST MINING
CORPORATION ! ... and taking direct orders from Palmer, President of
Newcrest & Mining Criminal in his own right ... alongside all that other
manure of Newmont US ( Murdy) Newmont australia ( Etheridge) and all the
other Mining Criminals of BHP

Further still everything he says has the support of the Western Australian
Whorehouse aka West Australian Parliament, and of the Head Turd there,
Premier Geoff Turdy Gallop ! The job for what the Corrupt Gallop Turd is
paid underhand by Newmont Newcrest & BHP is to DENY !!! and the Turdy Gallop
is doing the JOB WELL, doesn't he ?

... and as a result Gallop 's Swiss coded account is full to the brim ! So
it has been for all the former WA Corrupt State Premier back to Sir Corrupt
Court of the infamous Court Dynasty of Corruption. Millions have been paid
by Newmont, Newcrest & BHP to those villains for keeping the ROYAL INQUIRY
REQUIRED INTO THEIR TELFER MINE FINANCIAL & MINING CRIMES FIRMLY UNDER THE
HEEL !

Millions indeed to Court Senior & Junior, Mansaros, Burke, Parker ( who fled
with the dough to Hong Kong ) Dowding, Slimy Lawrence, and now Turdy Gallop

But for the brave discoverer of al that richness, nothing except insults
from the australian Toads !

Yep, the Collective Punishment of the 9.2 Sydney Quake will be welcome
indeed in return for the 35 years duration Collective Crimes !
I look forward to it as confirmation of both the existence of an Immanent &
Eternal Justice, as well as a confirmation of the rightness of the True
Geology understanding of Earth Expansion

With best regards to all.


Jean-Paul Turcaud
Exploration Geologist
Founder of the True Geology

Australia Mining Pioneer
Discoverer and Legal Owner of Telfer, Nifty & Kintyre Mines
The Great Sandy Desert of Australia

* The "Golden Rule" or true story of the Discovery of the Telfer Mine
Author Bob Sheppard President of the APLA (Australian Prospectors' Union)
http://www.tnet.com.au/~warrigal/grule.html ,

* As well as Dr Don Findlay's Geological Site
http://users.indigo.net.au/don/tel/index.html

~~ Ignorance Is The Cosmic Sin, The One Never Forgiven ! ~~







"Sunny" <wombathouse@yahoo.com.au> a écrit dans le message de news:
zEIlf.13990$ea6.1952@news-server.bigpond.net.au...

"Jean-Paul Turcaud" <xyz@atlante.edu> wrote in message
news:dn73r2$onb$1@aphrodite.grec.isp.9tel.net...
I wish you all an excellent 9.2 Sydney Quake, plus of course the
following
100 ft Tsunami to thank you of your 35 years duration Collective Crimes !
Jean-Paul Turd

Back to your cage, it's time for your meds.