Search found 1320 matches

by texaspyro
Apr 20, 2013 8:07 pm
Forum: Battery Technology
Topic: DIY Programmable BMS (now using ATtiny/Arduino)
Replies: 218
Views: 32256

Re: DIY BMS

that won't affect size, which is just under 4x6 inches for a 16S BMS. Make the board 100x150mm (or a tad smaller) and SeeedStudio can make them fairly quickly for a rather good price. Their prices are based upon the board outline fitting within various rectangles. I've been using OSH Park so far an...
by texaspyro
Apr 18, 2013 11:31 pm
Forum: E-Bike Technical
Topic: Amberwolf's Delta Trike Build v1.0 (The Delta Tripper)
Replies: 126
Views: 24512

Re: Amberwolf's Delta Trike Build v1.0 (The Delta Tripper)

How many SPERM (spokes per mile) does this thing get?
by texaspyro
Apr 16, 2013 1:15 am
Forum: Battery Technology
Topic: DIY Programmable BMS (now using ATtiny/Arduino)
Replies: 218
Views: 32256

Re: DIY BMS

dmwahl wrote:that won't affect size, which is just under 4x6 inches for a 16S BMS.
Make the board 100x150mm (or a tad smaller) and SeeedStudio can make them fairly quickly for a rather good price. Their prices are based upon the board outline fitting within various rectangles.
by texaspyro
Apr 02, 2013 8:47 pm
Forum: E-Bike Technical
Topic: building my own bike light budget $50
Replies: 32
Views: 1909

Re: building my own bike light budget $50

I took a look at some of the arrays by Bridelux, unfortunately there a little out of my price range.... -Do you think if I run the crappy Chinese arrays in these conditions, they would be ok? +Constant 20mph speed +Max run time of only ten minutes +50% power to bring down the heat +Massive aluminum...
by texaspyro
Apr 01, 2013 10:59 pm
Forum: Battery Technology
Topic: Arduino BMS Shield using TI BQ76PL536A (Update 9/16)
Replies: 89
Views: 15095

Re: Arduino Mega BMS Shield using TI BQ76PL536A (Update 3/4)

I did some research and ended up adding this N-Channel mosfet to mine. http://www.digikey.com/scripts/DkSearch/dksus.dll?WT.z_header=search_go&lang=en&keywords=FQP50N06L&x=0&y=0&cur=USD Thats a REALLY crappy FET. Try an IRLB3036. It has 1/10th the on resistance and will dissipate 1/10th the power.
by texaspyro
Mar 31, 2013 11:09 pm
Forum: Battery Technology
Topic: Thread for new battery breakthrough PR releases
Replies: 1447
Views: 124026

Re: B456 Battery

BR549
by texaspyro
Mar 31, 2013 10:52 pm
Forum: E-Bike Technical
Topic: building my own bike light budget $50
Replies: 32
Views: 1909

Re: building my own bike light budget $50

No way. Those LEDs will be a puddle of molten slag within seconds. You need massive heatinking on those things (like 10 square inches of surface area per watt) unless you use forced air cooling.. Also those Chinese LED arrays are crap. Search Digikey for arrays made by Bridgelux. Here is my 15,000+ ...
by texaspyro
Mar 26, 2013 12:34 am
Forum: E-Bike Technical
Topic: Amberwolf's Flatbed Kennel Trailer
Replies: 36
Views: 8447

Re: Amberwolf's Flatbed Kennel Trailer

amberwolf wrote:better and more reliably.
Reliable? Amberwolf concoction? Yeaaaah, riiiiight. Are you going to install the automatic spoke snappers and tire flatteners? :roll:
by texaspyro
Feb 28, 2013 11:54 pm
Forum: E-Bike Technical
Topic: Throttle Smoother 3.0 - Linear Ramp Circuit
Replies: 14
Views: 1355

Re: Throttle Smoother 3.0 - Linear Ramp Circuit

I see no power supply bypass caps... could cause some problems... like oscillation.
by texaspyro
Feb 20, 2013 11:36 pm
Forum: E-Bike Technical
Topic: Fisher Price: My First Delta-Wye Conversion
Replies: 3
Views: 585

Re: Fisher Price: My First Delta-Wye Conversion

Those Sparkfun key switches are crap... avoid them!
by texaspyro
Feb 19, 2013 1:59 am
Forum: E-Bike Technical
Topic: How to reduce drift after soldering shunt?
Replies: 21
Views: 1627

Re: How to reduce drift after soldering shunt?

Proper shut wire is made from alloys that have a very low temperature coefficient (home much the resistance changes with temperature). Solder does not. Also you may be getting a thermocouple effect due to the dissimilar metals in contact. But I don't think that is the reason for what you are seeing....
by texaspyro
Feb 03, 2013 9:44 pm
Forum: Battery Technology
Topic: Cheap DIY BMS
Replies: 8
Views: 1139

Re: Cheap DIY BMS

Run the balancer all the time (whether charging or running the motor). I built some small ones a while back: https://endless-sphere.com/forums/viewto ... 14&t=20864
by texaspyro
Jan 06, 2013 11:58 pm
Forum: E-Bike Technical
Topic: Amberwolf's Delta Trike Build v1.0 (The Delta Tripper)
Replies: 126
Views: 24512

Re: Amberwolf's Delta Trike Build v1.0 (The Delta Tripper)

You should just mod a Big Wheel! You would be the coolest kid on the block.
by texaspyro
Dec 17, 2012 1:40 am
Forum: E-Bike Technical
Topic: Build your own CD battery tab welder for about $100.00+-
Replies: 987
Views: 180461

Re: Build your own CD battery tab welder for about $100.00+-

You don't want a sharp point on the electrodes. A rounded tip works much better.
by texaspyro
Dec 11, 2012 12:43 am
Forum: E-Bike Technical
Topic: Cheap PCB manufacturing!
Replies: 10
Views: 1072

Re: Cheap PCB manufacturing!

I have been using OSHPark for proto boards for about a year. Quality is phenomenal. I could "fly" these prototype boards. Never had a problem yet. High Tglass temp boards, resolution better than I need, and gold flash. Not to mention that they are made the USA! And are purple. As far as KiCad files...
by texaspyro
Dec 07, 2012 8:50 pm
Forum: E-Bike Technical
Topic: 2WD Semi-Recumbent Recycled-Parts Cargo eBike: "CrazyBike2"
Replies: 1128
Views: 175564

Re: Semi-Recumbent Recycled-Parts Cargo eBike: "CrazyBike2"

amberwolf wrote:I kinda had a "feeling" there was something odd becuase the inches seemed smaller than they should
It's called inchflation... very similar to the ounceflation that you see in packaging (like 8 ounces of product in a 16 ounce sized package)
by texaspyro
Nov 29, 2012 8:33 pm
Forum: E-Bike Technical
Topic: Cheap PCB manufacturing!
Replies: 10
Views: 1072

Re: Cheap PCB manufacturing!

llile wrote:Gotta know how to make Gerber files with Eagle, http://www.cadsoftusa.com/download-eagle/ but that isn't hard to learn.
No you don't! Just email your Eagle .BRD files to http://oshpark.com/ and for 5 bucks a sq in, no setup or domestic postage, you get three boards.
by texaspyro
Nov 09, 2012 11:54 pm
Forum: E-Bike Technical
Topic: 2WD Semi-Recumbent Recycled-Parts Cargo eBike: "CrazyBike2"
Replies: 1128
Views: 175564

Re: Semi-Recumbent Recycled-Parts Cargo eBike: "CrazyBike2"

Ahhh, now that's the Amberwolf we all know and love... it's hard to believe you went so long without a wheel disaster.
by texaspyro
Nov 09, 2012 11:48 pm
Forum: E-Bike Technical
Topic: Smoke from fire kill componets ?
Replies: 1
Views: 189

Re: Smoke from fire kill componets ?

It can deposit a conductive film of carbon particles. But If the device isn't covered in black spooge, it should be OK.
by texaspyro
Nov 09, 2012 11:46 pm
Forum: E-Bike Technical
Topic: How to drive high-side N-channel FET to saturation??
Replies: 13
Views: 1219

Re: How to drive high-side N-channel FET to saturation??

i thought that the H-bridge ICs had a special charge pumping circuit that allowed the high side to be on continuously. gotta google when i get a chance and see what wikipedia says. Almost all the data sheets mysteriously don't discuss the matter. Ask their FAEs and you get the song and dance routin...
by texaspyro
Nov 08, 2012 6:57 pm
Forum: E-Bike Technical
Topic: How to drive high-side N-channel FET to saturation??
Replies: 13
Views: 1219

Re: How to drive high-side N-channel FET to saturation??

And remember, standard bootstrap circuits/high side drivers are useless if you need the high side FET to be on continuously...
by texaspyro
Oct 21, 2012 4:11 pm
Forum: Battery Technology
Topic: Got 150W 980nm laser pump.. now watt?
Replies: 27
Views: 1311

Re: Got 150W 980nm laser pump.. now watt?

bigmoose wrote:... cover your good eye with a patch! :mrgreen:
scarylaser.gif
(29.82 KiB) Downloaded 3 times
by texaspyro
Oct 15, 2012 9:52 pm
Forum: Battery Technology
Topic: Lifepo4, never below voltage?
Replies: 22
Views: 2510

Re: Lifepo4, never below voltage?

Katou sent me a bunch of A123 cells that were at 0V to test my welder. On a whim I charged them up. Half were perfectly good and are still going strong. I did manage to kill one by leaving a 4S pack connected to a load for a month.
by texaspyro
Oct 14, 2012 9:57 pm
Forum: Battery Technology
Topic: Thread for new battery breakthrough PR releases
Replies: 1447
Views: 124026

Re: NEC increases electric vehicle battery capacity 30 perce

Sanyo is currently shipping a 4.3V/3400 mAh 18650 LiCo cell... 4.3V is a minor improvement over 4.2V, but they seem to be the only one to make it a commercial reality. Raising lithium chemistry voltage is tough to pull off in the real world...
by texaspyro
Oct 14, 2012 9:35 pm
Forum: E-Bike Technical
Topic: Build your own CD battery tab welder for about $100.00+-
Replies: 987
Views: 180461

Re: Build your own CD battery tab welder for about $100.00+-

ob1 wrote:My sincere thanks to all of you that have asked insightful questions, corrected my silly mistakes, and posted your experiences on Endless Sphere,
Hi Tim! Long time, no see... Hope the move went well.