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Quadrature is the common name for two bit Gray code. The two most significant bits of Gray coding is a quadrature pattern.

Try a LM338. Basically an upgrade to the 78xx series.

For shortish lengths, 1 mm2 per 10 Amps is a rough guide.

Two comments:

- BCD is really 4 bits per decimal digit, packed, and looks the same as Hexadecimal except that the upper 6 codes are not used. So, the above method is not quite BCD.

- When...

What you are seeing is the load ringing backfed through the capacitive coupling of the mosfet. I always add a series resistor to the mosfet gate and also a clamping zenor/transorb to the mosfet...

There is a distinction between what is usually meant by float charging and trickle changing. It comes from the two differing charge modes employed by Lead-Acid vs Ni-Cd. Once the battery is...

12 volts might be enough speed for your needs. Motors aren't fussy. I recommend using a drive with controllable current though.

On that subject, the customer literally dropped a spanner on the slip-rings between those units I built and the heater elements they were powering. No problem at all. Only the fuse blew. With the...

manie, Maybe this thread will help. Have a read of what I've done in the last two posts.


Evan

Constant current means the same thing as a current limit. It's exactly the same for voltage.

And yes, to preset the current level you short the output. Otherwise the voltage limit will be...

Heh, I was trolling a little. That said, I wasn't comparing the OLPC to netbooks but rather netbooks with laptops.

Regarding the OLPC's three hour limit, what about without the backlight? That's...

CC/CV regulation doesn't switch as such. Both functions are active at all times but which function that is limiting is dependant on the load conditions.

If the load voltage rises to the voltage...

I do have a complaint with the OLPC - I can't buy one without going to some risky overpriced EBay auction.

They're certainly not a laptop replacement. Laptop's are mostly purchased as a status symbol desktop replacement. Their batteries go flat in an instant.

The reason why I liked it was the longest battery I've found so far. I want to use it for browsing while on the beach. So, the requirements are:

- No power plug for hours on end. (Comes close...

For anyone that's interested, the Eee PC 901's battery capacity is 48 W-hr.

/me looks up details - 8 hour battery on the 901! And a 20 GB SSD, nice. Pitter-patter - sold!

Throw us some pictures of these cells and charger. We are talking a Li-Ion single cell charger, right? How big is this biggest size possible? Are you buying them or salvaging them?

Lol, well done! That must have taken some practise.

I like the way you've zoomed in so that the text is easy to read. You've used something smart to do that I presume?


Evan

Err, I'm a bit out of date. The only active sensor left with quadrature outputs is the ADNS-2051.

I've just had a good look through the new list of datasheets at...

Oh, and the unused pins from 7-10 on the sensor are the X-Y axis quadrature outputs that can be used instead of the SPI port.

The optical mouse sensors are all designed by Hewlett Packard -> Agilent -> some other name now. The optics division has been sold off at least twice.

The different parts are just the various...

Only the last condition will ever be true. So, no, not at the moment.

The Pic as a processor is pretty sucky to program. It only has a single 8 bit accumulator. Most instructions involve some acrobatics through this one register so there is a ton of twisted tricks to...

One assumes you are still testing the previously fried circuit. As much as you don't want it to be true you really have to accept the highly likely case of the Picaxe and DS1307 are dead.

With...