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Old 11-23-2010, 06:23 PM   #4041 (permalink)
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..............ehhhhhh whats this about driver boards? i feel left out

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Old 11-23-2010, 06:33 PM   #4042 (permalink)
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Quote:
Originally Posted by jackbauer View Post
..............ehhhhhh whats this about driver boards? i feel left out
You never received my personal invitation to the party, OMG !!!
Please, read few post back.........
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Old 11-23-2010, 07:19 PM   #4043 (permalink)
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Sorry jack, we all decided to leave you out, since only the cool people can have them. hahahaha
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Old 11-23-2010, 07:43 PM   #4044 (permalink)
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Quote:
Originally Posted by DJBecker View Post
I was traveling and missed this post the first time around.

If the Darlington pair couldn't handle the frequency, or were not driven strongly enough to put the output into saturation, they wouldn't be full on or full off. They would be somewhere in the middle. It doesn't take long for them to effectively melt -- enough internal dopant diffusion happens for them to become low value resistors..
Sorry chaps, have not been keeping up to date lately, has anyone pointed out that driving darlingtons (or any BJT) is a different challenge to MOSFETs and IGBTs. Straining the memory a bit here but one is about supplying current and the other is about supplying voltage. Yes I know that the two are inseparable but there is definitely different approach to each. My point being that a circuit that is perfectly suited to driving MOSFETs is very likely not suited to driving Darlingtons.
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Old 11-23-2010, 11:02 PM   #4045 (permalink)
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Jack don't let them kid you they only did that because they learned Ireland is bankrupt....
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Old 11-23-2010, 11:09 PM   #4046 (permalink)
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I recently found out that I am part Irish. My Irish grandfather (mom's dad) used to jump out of trees and try to stab deer. The only reason my grandma married him is because he said he'd kill her whole family. hahahahaha. He was crazy, sort of like Jack. But jack is crazy in good ways!
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Old 11-24-2010, 12:03 PM   #4047 (permalink)
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EV display

LouMan - I found some good info on making a VGA out with an AVR microcontroller. Might be good for your idea of making a built in method for displaying info rather than using a computer.

VGA interfacing AVR microcontrollers - Hack a Day
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Old 11-24-2010, 12:21 PM   #4048 (permalink)
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Thank you thank you thank you Grimm!!!!! This is just the sort of thing I would like to try. I used to make crappy 320x200 and 320x240 (the secret mode x) video games in the 90's. When everyone was starting to move to windows, I was still in DOS and assembly language. I got to be something of an expert with smooth graphics, double buffering, etc... Top of the line 1985 graphics! The trouble was, it was 1994. So, no one wanted to buy the games, but at least I could do something like this now!!!! Oh heck ya! Are there cheap vga screens that could go in a car?!

Is anybody else's favorite author Andree Lamothe?! I own every book he every wrote.
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Old 11-24-2010, 01:03 PM   #4049 (permalink)
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There are plenty of laptop displays out there.
They might even have a common electronic interface or two, since they are just contract parts.
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Old 11-24-2010, 01:06 PM   #4050 (permalink)
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4d display

On the topic of displays, I have been thinking about revisiting my CougArd Explorer idea with one of these. They are around $79, 3.2" lcd with touch screen, 240x320, built in speaker and uSD card reader. It is a smart display, that is you write an app for the embedded graphics processer. It has 2 serial ports, one for the Cougar controller and one for my bms. The idea is to get both of these connected to the display, sending serial data to it and then program the display to, well, display it. I have downloaded their IDE and am trying to get my head round it (UK phrase). Overall it looks good (at least on paper), only real complaint so far is the small size, but they also sell a driver board that could be connected to a larger display.

Greg

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