Driver to drive?

From: kensmith@green.rahul.net (Ken Smith)

No, you don't want to take the RMS value of the product. You want to
average to product. The product of the current and voltage will have two
components. It will have a DC value equal to the average power and a sine
wave at twice the frequency. This sine wave at twice the frequency, you
want to ingore. The RMs would include it in the answer.

For this to have much value wouldn't you just want to show the wattage peeks?
Click to expand...
That is if this is going to be used to monitor clipping.

Rocky
 
I once had to use a nasty little atmel micro (no multiply instruction ?!)
for a 400W smps - it was a customers design I had to make go.
Click to expand...
Hmm.. Must have been one of the earlier chips.
As I said, the Tiny-26 can go 500kHz at 8 bit, just using the on-chip osc.

--
KC6ETE Dave's Engineering Page, www.dvanhorn.org
Microcontroller Consultant, specializing in Atmel AVR
 
Joel Kolstad escreveu:
More information on the Yorktown:

"The Yorktown lost control of its propulsion system because its computers
were unable to divide by the number zero, the memo said. The Yorktown's
Standard Monitoring Control System administrator entered zero into the data
field for the Remote Data Base Manager program. That caused the database to
overflow and crash all LAN consoles and miniature remote terminal units, the
memo said."
Click to expand...
To avoid dividing by 0:

FUNCTION DIV(X,Y)
IF Y = 0 then DIV = 10^38
ELSE DIV = X/Y
END IF

At most, this will cause bad results instead of a crash.

[]s
--
Chaos MasterŽ, posting from Brazil.
"People told me I can't dress like a fairy.
I say, I'm in a rock band and I can do what the hell I want!"
-- Amy Lee

The Evanescen(t/ce) HP: http://marreka.no-ip.com
Free energy? It's a lie: http://tinyurl.com/46vru
 
Are you sure that's not a 3842?

I have the data book on that.

Damned shame about cherry, they had nice chips.
They took the 3717 that Rifa did, and redesigned the die, so they actually
could answer questions about it. :)

--
KC6ETE Dave's Engineering Page, www.dvanhorn.org
Microcontroller Consultant, specializing in Atmel AVR
 
SEVEN bits.. damned new glasses..
:p

--
KC6ETE Dave's Engineering Page, www.dvanhorn.org
Microcontroller Consultant, specializing in Atmel AVR
 
You cant get any radio waves with a short antenna at low frequencies.
Secondly, if you could, the authorities wouldn't allow you to.
Click to expand...
nRF2401 works nicely, or for baseband, look up inductive loop signalling.
A simple pickup coil will get the signal anywhere in the loop, and not at
all, outside.
Museums use this for audio programs that run in each room, with no
spillover.
The receiver is dead simple, a coil of wire, and an amplifier.

--
KC6ETE Dave's Engineering Page, www.dvanhorn.org
Microcontroller Consultant, specializing in Atmel AVR
 
Steve Roberts wrote...
Anybody have a old Cherry Semi data sheet for cs322/cs324?
Click to expand...
I have a copy.


--
Thanks,
- Win

(email: use hill_at_rowland-dotties-org for now)
 
In article <wd2dndhgwIuaHfHcRVn-vQ@comcast.com>,
Dave VanHorn <dvanhorn@cedar.net> wrote:
SEVEN bits.. damned new glasses..
Click to expand...
One bit would be enough if the output filter cap is large enough.


--
--
kensmith@rahul.net forging knowledge
 
Dave VanHorn wrote...
Damned shame about cherry, they had nice chips.
They took the 3717 that Rifa did, and redesigned the die,
so they actually could answer questions about it. :)
Click to expand...
Did Unitrode start the game with their uc3717 controller?
Then lots of folks made the PBL3717A after RIFA in 1986,
including TI, ST and Ericsson. Plessy had the TDA3717.


--
Thanks,
- Win

(email: use hill_at_rowland-dotties-org for now)
 
"Joerg" <notthisjoergsch@removethispacbell.net> wrote in message
news:IwTad.12058$nj.8753@newssvr13.news.prodigy.com...

Back in my days at the university one of our professors used to joke
that the quality of a digital designer is inversely proportional to the
number of one-shots he or she uses. Now I don't quite agree with that
and I use them a lot myself, even though they will be "home made" rather
than a 555 or HC123. It's just that the cost picture changes with longer
timings and cost is usually the predominant factor in a commercial design.
Click to expand...
I once saw the a digital filter that was based on one-shot timers. A friend
of mine was given the project to redesign after the origianl designer had
been encouraged to seek employment elsewhere.
 
On Tuesday 12 October 2004 05:43 pm, Chaos Master did deign to grace us with
the following:

Joel Kolstad escreveu:
More information on the Yorktown:

"The Yorktown lost control of its propulsion system because its computers
were unable to divide by the number zero, the memo said. The Yorktown's
Standard Monitoring Control System administrator entered zero into the
data field for the Remote Data Base Manager program. That caused the
database to overflow and crash all LAN consoles and miniature remote
terminal units, the memo said."

To avoid dividing by 0:

FUNCTION DIV(X,Y)
Click to expand...
IF X < 0 then SGN = -1 else SGN = 1 ' see note
IF Y = 0 then DIV = (10^38) * SGN ' see note
ELSE DIV = X/Y
END IF
At most, this will cause bad results instead of a crash.
Click to expand...
Or -3/0 == +infinity. ;-)
(see revised pseudocode, above)

Cheers!
Rich
 
"john jardine" <john@jjdesigns.fsnet.co.uk> wrote in message
news:ckhm2a$3so$1@news6.svr.pol.co.uk...
robin.pain@tesco.net> wrote in message
news:bd24a397.0410121101.1c1469de@posting.google.com...
"colin" <no.spam.for.me@ntlworld.com> wrote in message
news:<GhSad.1102$y04.76@newsfe5-win.ntli.net>...
robin.pain@tesco.net> wrote in message
news:bd24a397.0410112324.42477888@posting.google.com...
"Left hand down a bit number one. What's that to starboard?"

"It's the missing DLL captain."

"Hold her steady, steady... Fire!"

"I can't sir, it says 'Windaz has detected you are too pissed to
operate machinery' Sir."

"What! lemme see! Blimey they've installed "Windaz-too-thoosand
(c)",
the student version for the North of England... none of us will be
able to use it, I told them to get the full home version."


Please tell me theres no truth to this at all?

"never a truer word has been spoken in jest"

Colin =^.^=

http://www.theregister.co.uk/2004/09/06/ams_goes_windows_for_warships/

http://members.lycos.co.uk/mriainwilson/humour/

Those defense procurement civil servants haven't a f****ng clue. They
supplied shit military equipment in WW1 and WW11 and they're still at it
now.
To a man, all ex public school boys and old school tie. All arts
graduates.
All closeted in comfy Whitehall offices. All waiting to stroll across to
board positions in the arms companies they're supposed to be dealing with
on
our behalf.
No one oversees them. No one can bring them to account. No one of them
will
ever blow a whistle. All of them incompetant and corrupt as hell.
They issue our troops with the (still) f****ng useless SA80 rifle. Clothe
'em in inferior materials. Give 'em second rate boots to wear. Fail to
issue
'em with body armour yet allow massive cost overruns on UK produced war
materiel that could be much better and cheaper sourced elsewhere.

Windaz in subs and naval vessels?. Jesus f****ng wept.
The whole of the procurement executive need their arses smacking.
Engineers
putting in charge and a long term, commons investigative commitee setting
up.
Click to expand...
The US Navy sent a warship to see with Windows NT running all the ctitical
systems. When it locked up (surprised?) the captain was ordered not to
reset the machines so that their failure state could be analyzed at the
dock. The ship was towed back to port.
 
In article <4fqdnZ_a0cCy7_HcRVn-oQ@comcast.com>,
Joel Kolstad <JKolstad71HatesSpam@Yahoo.Com> wrote:
[...]
overflow and crash all LAN consoles and miniature remote terminal units, the
Click to expand...
How did the overflow in one part of the code crash all of the LAN
consoles? It sounds like there's some bad design there. The system seems
to have a single failure point. If the database code was an application
running under an OS, it should not be able to crash the whole system.
--
--
kensmith@rahul.net forging knowledge
 
On Tuesday 12 October 2004 04:03 am, Scott Stephens did deign to grace us
with the following:

Rich Grise wrote:

I like the Scott Adams Plan for Airline Security. A new airline company:
Atheist Airlines. There's a little booth by the gate, with icons and
gewgaws and whatnots and totems and things from every major religion on
the planet. Before you get on the airplane, you have to go into the booth
and blaspheme every one of them. Then, carry whatever weapons you want on
board. Need a bazooka? No Problem! Mini-gun? You'll have to buy a ticket
for that big boy! Grenades? Cool!

You see, atheists generally don't go around stirring up huge amounts of
trouble where there isn't a ready escape route. ;-)

What about those non-Christian "neo-con" atheist Zionists that heartily
encourage invading Iraq, and the liberal-civilizing of Islam?
Click to expand...
They won't have any luck hijacking a plane, if all the rest of the
passengers are armed to the teeth.

As far as fixing the neocons, only God can do that. ;-)
It aint 'bout religion!
Click to expand...
The current war seems to be, although nobody will admit it.

Thanks!
Rich
 
For Kevin,
How is the weather there? still raining? it is so sad.

Say hello to your umbrella.

Smile :D

Be good.

Best regards,
Boki.


"Dave VanHorn" <dvanhorn@cedar.net> źśźgŠóślĽóˇsťD:8MOdnQip365RHfHcRVn-sQ@comcast.com...
You cant get any radio waves with a short antenna at low frequencies.
Secondly, if you could, the authorities wouldn't allow you to.

nRF2401 works nicely, or for baseband, look up inductive loop signalling.
A simple pickup coil will get the signal anywhere in the loop, and not at
all, outside.
Museums use this for audio programs that run in each room, with no
spillover.
The receiver is dead simple, a coil of wire, and an amplifier.

--
KC6ETE Dave's Engineering Page, www.dvanhorn.org
Microcontroller Consultant, specializing in Atmel AVR
Click to expand...
 
Boki posted:

"For "Home device control", RF is expensive. : )

For controlling appliances, etc., look into CEBUS.

Don
 
In article <20041012204226.05051.00004800@mb-m24.aol.com>,
Rolavine <rolavine@aol.com> wrote:
[... average power ...]

For this to have much value wouldn't you just want to show the wattage peeks?
That is if this is going to be used to monitor clipping.
Click to expand...
Clipping Smipping! Its to make the buyer go "oooh ahhh" and part with
some cash. A fast responding meter looks to frantic and twitchy.

--
--
kensmith@rahul.net forging knowledge
 
Ken Smith wrote:

In article <wd2dndhgwIuaHfHcRVn-vQ@comcast.com>,
Dave VanHorn <dvanhorn@cedar.net> wrote:

SEVEN bits.. damned new glasses..


One bit would be enough if the output filter cap is large enough.
Click to expand...
did I mention they had no output cap? the open-circuit voltage didnt
look so nice :)

Cheers
Terry
 
Did Unitrode start the game with their uc3717 controller?
Then lots of folks made the PBL3717A after RIFA in 1986,
including TI, ST and Ericsson. Plessy had the TDA3717.
Click to expand...
AFAIK, unitrode just bought the design from Rifa.
Not sure how it propagated.

--
KC6ETE Dave's Engineering Page, www.dvanhorn.org
Microcontroller Consultant, specializing in Atmel AVR
 
Dave VanHorn wrote:
I once had to use a nasty little atmel micro (no multiply instruction ?!)
for a 400W smps - it was a customers design I had to make go.


Hmm.. Must have been one of the earlier chips.
As I said, the Tiny-26 can go 500kHz at 8 bit, just using the on-chip osc.
Click to expand...
I was brought in to "debug" their prototype, and had no say in micro
choice, topology etc. To make matters worse, they needed 3-phase
complementary interlocked pwm (ie 6 outputs) but phase-shifted rather
than duty cycle controlled - basically they had a nice 10kW "analogue"
smps built this way, and they tried to scale it down to 400W and control
it with a micro. They were adamant that it was a good idea (cf a
conventional smps), thereby forcing the wacko PWM requirement.
Simultaneously they refused to let me pick a different micro, even
though I showed them much better parts that were cheaper (although
interlocked 3-phase phase-shifted pwm isnt necessarily easy to achieve
even with dedicated motor control micros). it was an 8MHz 4433 - old,
slow and generally with few redeeming features - the lack of a multiply
instruction was an issue in a control loop.... its ADC sucked too.

500kHz 8-bit is great! I will check them out....

cheers
Terry
 
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