120 Degree Phase Shift Osc.

Sloman

seem

between

simple fitler.

channel.

summing

else none.

use R2R ladders.

They are OK, but if you're going to learn something new, it may as well be ARM. It looks like ARM is going mainstream, a serious threat to x86. But unlike x86, there are ARMs below $1.

John

tions

-

ough

I addressed power consumption in my very first post. I guessed

I was quoting data for the 23-year-old example I'd given, from the data sheet, running it @ 14MHz as I did back then. It's an 80c51- family part. The exact details didn't matter since there are thriftier parts today (like the PIC I first suggested). Even so, I gave you the exact part number, and I did the homework too, and you dismissed it.

Clearly I'm not going to satisfy you--your objections keep changing, and even when I address them you don't believe me, and then won't check for yourself. I can't win, so I'm gonna quit while I'm behind.

-- Best regards, James Arthur

happenedBillSloman

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He shouldn't have called you a liar; he should have called you an idiot. A low-power uP is all CMOS and can do a modest frequenct polyphase sine with PWM or delta-sigma at a port pin using a tiny amount of power. DDS with DACs would be a lot more work and, using an integrated DDS+DAC chip, use a lot more power.

John

(PST),BillSloman

happenedBillSloman

:

isn't

The real question is why anyone would want to use a sine wave generator to drive relay coils.

John

He should have been more careful and called you an unskilled windbag.

Stick to arguing off-topic blather like climate and economics. When you talk electronics, you expose yourself too much.

John

happenedBillSloman

It was not to energize the coils for its intended use, it was to use the coils of REEDS to generate a rotating field.. The reeds themselves were not serving any purpose..

At 10 Hz, this sounds like either a Eddy current project or, maybe some specific type of simple motor for what ever... The coils being the stator... I guess one could mount a PM as part of the rotor and make a simple synchronous motor..

At work, we use a rotating field of 10 hz around aluminum armor just after it leaves the welding position and before the corrugator. This is used to detect cracks in the weld by producing eddy currents that can circle around the tubing. This is why at 10 Hz requirement, I suspect it to be some sort of eddy current device.. But who knows.

Jamie.

Sloman

fitler.

summing

none.

R2R ladders.

SO, you're taking some one else word for it ;)

--
Tuned in late, huh?

REALLY LATE! ...Jim Thompson

-- | James E.Thompson, CTO | mens | | Analog Innovations, Inc. | et | | Analog/Mixed-Signal ASIC's and Discrete Systems | manus | | Phoenix, Arizona 85048 Skype: Contacts Only | | | Voice:(480)460-2350 Fax: Available upon request | Brass Rat | | E-mail Icon at

| 1962 | Ding Dong! That Wicked Old Witch Pelosi is Dead! Hurrah! Hurrah!

Sheesh! How can you see anything that small - or was the monitor H U G E ? When I go higher res than 800x600, characters get too small for me. It's a 19" monitor.

Ed

I have two 1280x1024 ViewSonic flat screens, side-by-side, seems to be about right for my eyes.

Speaking of which, these monitors are quite old, and one is starting to get flaky... sometimes doesn't want to stay on.

What's the best replacement now-a-days? ...Jim Thompson

--
| James E.Thompson, CTO                            |    mens     |
| Analog Innovations, Inc.                         |     et      |
| Analog/Mixed-Signal ASIC's and Discrete Systems  |    manus    |
| Phoenix, Arizona  85048    Skype: Contacts Only  |             |
| Voice:(480)460-2350  Fax: Available upon request |  Brass Rat  |
| E-mail Icon at http://www.analog-innovations.com |    1962     |
             
 Ding Dong! That Wicked Old Witch Pelosi is Dead! Hurrah! Hurrah!

Thanks, John.

It's not failing for me now, and it seems almost guaranteed the problem was at my end, not at your site. Others using Firefox, even the identical release, had no problem. So you probably shouldn't waste any effort on it, unless you hear from someone else.

Ed

Sure. I trust and believe you guys. Kudos to Lasse for breadboarding it. I bet he could do it for a lot less power too if he wanted, but there's scarcely any reason to.

As far as AVRs, I read the documentation and fell in love with them, I'm just waiting for an application. I like the instruction set, the peripherals, the low-power draw (which was my first interest in them), and the *speed*.

-- Cheers, James Arthur

Great, I think you guys did a good job.

GIMP is actually cross-platform (runs on PCs, Mac, Linux, etc.) -- it's kinda like OpenOffice (also cross-platform) vs. Microsoft Office: Compared to PhotoShop, it doesn't have nearly as many features, but the ones missing are pretty advanced that many people never actually use.

No! Snipping rocks, *sniping* sucks! :-)

Hey, here's an idea I didn't have time to offer: pump a cap up/down with pulses from a uC output pin, floating the pin in-between pulses. That cuts the active time by factors.

There are, of course, several possible combinations of pulsing techniques (fixed or variable width and timing, delta-sigma, etc.) and current sources (simple resistor, charge pump, true current source, etc.).

-- Cheers, James Arthur

"Jim Thompson" wrote in message news: snipped-for-privacy@4ax.com...

Well, the best "bang for the buck" these days is typically 21-23" monitors at

1920x1080 resolution -- there are many that can be had for well under $200, e.g., (21", $140 shipped). Although in your case, it's probably worth paying extra for a physically larger monitor. -- the 23" version of that same monitor is only $20 more. If you can afford it, for

Sloman

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n, you

z

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t

n.

While you claims to be an expert on low-power design, based on a design in which the low-power microprocessor draws 38mA on average. You seem to be missing your fig-leaf.

-- Bill Sloman, Nijmegen

butions

er -

enough

e

Which PIC? There are a few of them, as I've reminded you earlier in this thread.

But I did check for myself, and your 23-year-old number didn't tie up with the current data-sheet, which isn't altogether surprising. Since you hadn't told us that you were quoting an obsolete number, a certain measure of scepticism wasn't unreasonable.=A0

It hasn't looked as if you were trying all that hard when you were competing.

-- Bill Sloman, Nijmegen

I used to like AVRs because of simplicity, speed and excellent suitability for the C/C++ programming. IAR toolset for AVR is great. Did quite a few projects with AVRs, but now I would think twice before designing in an AVR.

1. Atmel drops entire product lines just like it.
2. Atmel introduces incompatible changes in the devices just like it.
3. AVR is not distinguished at low power consumption; many of the competition is a lot better in this regard.
4. Poor peripherals.
5. Bigger AVR devices are way over price; IMO optimal AVRs are 4k/8k class devices.
6. Can't execute code from RAM. So, if in-application programmability is required, the bootloader has to be always present in the flash. So, bootloader can be activated by accident, and this is potential reliability problem. That actually happens!
7. No ratings on flash/eeprom power consumption while programming.
8. No ratings on flash/eeprom retention in high/low temperatures.

Summarizing: AVR is good for stupident/hobbyist/amateur/low volume. Not suitable for mass production.

Vladimir Vassilevsky DSP and Mixed Signal Design Consultant