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William "Chops" Westfield | 1 May 01:38
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Re: [OT]: Graphics cards with DVI-D outputs (for 2560x1600 monitors)


On Apr 30, 2007, at 2:52 PM, Vitaliy wrote:

> Does anyone have a suggestion for a suitable graphics card?
>
As a starting point, you can look at the video cards supplied
by Apple with Macs, since those will all drive the 30inch apple
LCD plus another DVI monitor...

BillW; jealous; I'd have to remodel my desk to support a 30inch :-(
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Jinx | 1 May 01:35
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Re: [PIC] [EE] Signal Generator

> Or go to Analog Devices and get a DDS (Direct Digital Synthesis)
> generator chip.

Silicon Chip May 2003 has such a generator. AD9835 (+ 16F628 for
selection and display) to output 1Hz to 10MHz, sine / square

http://www.siliconchip.com.au/cms/A_102145/article.html

http://www.analog.com/en/prod/0,,770_843_AD9835,00.html

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PicDude | 1 May 04:07

Re: [EE] Favorite cheap, small automotive rated voltage regulator?

Look into 2 parts together -- ST Micro's RBO40 (Mouser has them) as a 
protection device with any regulator of your choice.  For low current stuff 
(~150mA), I use regular (linear) 7805's.  For 1Amp+, I use the LM2670 
switching regulators from National.  I've had excellent results so far with 
hundreds of these in use.

-Neil.

On Monday 30 April 2007 11:51, Harold Hallikainen wrote:
> I'm working on a PIC project where I need a cheap, small 5V regulator (50
> to 100mA out) that is rated for automotive use (is able to deal with
> voltage spikes, reverse voltage, etc.). Anyone have any favorites?
>
> THANKS!
>
> Harold
>
>
> --
> FCC Rules Updated Daily at http://www.hallikainen.com - Advertising
> opportunities available!
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Vitaliy | 1 May 02:40

[EE]: "Horsepower" in Europe

I'm helping a friend write an ad copy, and we can't decide whether we should 
say

"- Measure engine power", or
"- Measure engine horsepower"

>From what I know, the tendency in Europe is to use kilowatts instead of 
horsepower.. 

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Rikard Bosnjakovic | 1 May 02:49
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Re: [EE]: "Horsepower" in Europe

On 5/1/07, Vitaliy <spam <at> maksimov.org> wrote:
> From what I know, the tendency in Europe is to use kilowatts instead of
> horsepower..

For engines you can stick to horsepower, but for "general" power, use kilowatts.

Although car manufacturers and the like tend to use kilowatts for
their engines as well, but hp has been the way to go for a long time.

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Richard Prosser | 1 May 02:52
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Re: [PIC] Measuring current

Rikard,

For a (very) rough check,
Tie a 10mA source to the collector of the bipolar. Increase the the
base current until the collector voltage drops to less than 0.6 (or
even just registers "low" on a pic input.) The ratio of 10mA to the
base current will give you the approximate hfe. at 10mA. (or 1mA or
10A etc.) Since the base current will be low, and the base voltage
will be in the 0.5 - 0.7 V area, a pwm generated voltage feeding a 10k
resistor to the base may be enough.

(50% pwm = 2.5V,
2.5V - 0.5V = 2V,
 2/10e3 = 200uA Base Current)

hfe = 10mA/200e-6 = 50.

RP
On 01/05/07, Harold Hallikainen <harold <at> hallikainen.org> wrote:
> Well, for your collector current sampler, you could do something like this:
>
> 1. Put a resistor from the output of an op amp to the inverting input, say
> 1k.
> 2. Drive the non-inverting input with the desired collector voltage, say
> +10V.
> 3. Connect the collector of the transistor to the non-inverting input of
> the op amp.
> 4. Ideally, the inverting input is at the same voltage as the
> non-inverting voltage, so it's at 10V. Ideally no current flows into
> either input of the op-amp, so all the collector current must flow through
(Continue reading)

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Jake Anderson | 1 May 02:56

Re: [OT]: Graphics cards with DVI-D outputs (for 2560x1600 monitors)

Vitaliy wrote:
> My new monitor arrived this morning, and after fighting with it for an hour, 
> finally figured out that my dual DVI-I card won't support it at full 
> resolution. The highest resolution I can get is 1280x800.
>
> Does anyone have a suggestion for a suitable graphics card?
>
> Vitaliy 
>
>   
Something sounds fishy to me.
I have an old AGP gfx card driving my 37" LCD @ 1920x1080x50Hz , in linux.
I had to turn all the EDID stuff off because the screen insisted that it
could only do 1024x768.

A single DVI cable is able to push to about 1920x1080x74.99999hz I
believe, you can probably trade the Hz for resolution though.

If you are using windows I believe the tool you want is powerstrip, it
lets you bugger around with pretty much anything.

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Richard Prosser | 1 May 03:03
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Re: [EE]: "Horsepower" in Europe

In Europe - what do you use for type pressure?

Here in NZ we are "fully metric" but the tyre pressure guage at my
local garage is still in PSI. kiloPascals are sometimes included in
small print but it's still PSI mostly - even though most kids wouln't
know what a pound or an inch looks like.

Richard P

On 01/05/07, Rikard Bosnjakovic <rikard.bosnjakovic <at> gmail.com> wrote:
> On 5/1/07, Vitaliy <spam <at> maksimov.org> wrote:
> > From what I know, the tendency in Europe is to use kilowatts instead of
> > horsepower..
>
> For engines you can stick to horsepower, but for "general" power, use kilowatts.
>
> Although car manufacturers and the like tend to use kilowatts for
> their engines as well, but hp has been the way to go for a long time.
>
>
> --
> - Rikard - http://bos.hack.org/cv/
> --
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> View/change your membership options at
> http://mailman.mit.edu/mailman/listinfo/piclist
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Rikard Bosnjakovic | 1 May 03:08
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Re: [EE]: "Horsepower" in Europe

On 5/1/07, Richard Prosser <rhprosser <at> gmail.com> wrote:

> In Europe - what do you use for type pressure?

I have not dealt with pressure at all so I cannot give a 100% reliable
answer - but kiloPascals sounds familiar while PSI does not.

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Vitaliy | 1 May 03:39

Re: [OT]: Graphics cards with DVI-D outputs (for 2560x1600 monitors)

William Chops Westfield wrote:
> As a starting point, you can look at the video cards supplied
> by Apple with Macs, since those will all drive the 30inch apple
> LCD plus another DVI monitor...

I don't have access to Macs... :(

> BillW; jealous; I'd have to remodel my desk to support a 30inch :-(

It's actually almost exactly like two 19" LCDs turned on their side, and put 
side-by-side. I am using two 20" flat panels right now, which give me 
approximately the same resolution (and even a bit more screen area). What 
I'd like to do, is have the 30" and next to it a 20" turned sideways (great 
for viewing datasheets and other PDFs).

At home, I have a single 17", which creates certain problems when I use 
Remote Desktop to access the work computer. Soon I'll have to upgrade. :)

Vitaliy 

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Gmane