#garfield Logs

Dec 17 2011

00:22 rue_house can we get monitors, keyboard, and mice too?
00:36 zhanx ?
11:54 iamturnip Well any left or can we do a deal still? Cheers dude
11:54 iamturnip Hawk
11:55 rue_house whats it worth?
11:55 rue_house ballpark
12:00 iamturnip dam ncat sitting on my laptop
12:00 iamturnip i tried calling yo about that....
12:00 iamturnip yes you canget keyboards and struf
14:29 rue_house thanks!
15:18 zhanx hi
15:19 rue_house hi
15:19 zhanx rue_house: review please https://docs.google.com/spreadsheet/ccc?key=0AtN1v-e6XpeIdEdRMVZBQzR2eVdOZnp6bGhkcHFGclE&hl=en_US#gid=0
15:20 rue_house ok what am I looking for
15:21 zhanx i got sensors that is the first half
15:21 zhanx then a set of motor drivers
15:21 zhanx and some attiny2313 that will be used in spi mode
15:22 zhanx think i am missing anything?
15:22 rue_house ok for a kit supliment to that platform I made?
15:22 zhanx yep
15:22 rue_house dmos driver, ok
15:22 zhanx ?
15:23 rue_house but the one I made uses modified servos' you dont need motor drivers
15:23 zhanx ok if they use motors instead....
15:23 rue_house be warned min motor supply voltage for that is 9.5V, so not good for 6V motors
15:24 zhanx hmmm
15:24 zhanx i need a 5v on
15:24 zhanx brb
15:24 rue_house also be warned that without LC filters, that 3V mtoros will burn up at any pwm value of 12V
15:25 rue_house I dont know if its possable to push a custom gate supply at the charge pump on that chip
15:25 rue_house the anoying thing is that a bipolar driver will usually drop 2V
15:26 rue_house there is a chip... I dont thin its made anymore...
15:26 zhanx ok dont lose that train of thought i have to get to dinner will be back soon
15:32 rue_shop I'm missing the robot
15:33 rue_shop AHA! I found that parts tho
15:33 rue_shop FAN8200
15:33 rue_shop its 1A 6V driver
15:33 rue_shop can you find it or an equiv?
15:38 zhanx let me look
15:38 rue_house hmmm not replaceed with anything
15:42 zhanx nope
15:43 rue_house http://www.onsemi.com/pub_link/Collateral/LB11847-D.PDF thats the only dip I can find, that even close, but its transistor saturation votlge is stull like 1.5V per transistor
15:43 zhanx l298n?
15:43 rue_house no
15:43 rue_house 2V drop again
15:43 rue_house the fan8200 has like .5 drop
15:44 zhanx 5.53 a chip for the LB11847
15:45 zhanx http://www.ti.com/litv/pdf/slvs855e
15:47 zhanx gonna get samples
15:48 rue_house tooo complex
15:48 zhanx yep
15:49 rue_house something with 4 logic level fets or somethign
15:49 zhanx http://www.ti.com/lit/ds/symlink/sn754410.pdf
15:51 rue_house hold up...
15:52 rue_house aha!
15:52 rue_house http://media.digikey.com/pdf/Data%20Sheets/NJR%20PDFs/njm2670.pdf
15:53 rue_house the saturation voltage on that isn't toooo bad
15:53 rue_house two independant bridges
15:53 rue_house thoguhts?
15:55 zhanx non stocked :(
15:55 zhanx no one has it in dip
15:55 rue_house oops, you dont have $2900 kicking around to buy 1000?
15:56 zhanx nope
15:56 rue_house prolly pay a fraction of that if you go manuf direct
15:57 rue_house what about a brushless motor driver chip?
15:58 zhanx http://search.digikey.com/scripts/DkSearch/dksus.dll?Detail&itemSeq=108464904&uq=634597337487169402
15:58 zhanx my motors has brushes tho
15:58 rue_house 'part not found'
15:58 zhanx http://search.digikey.com/us/en/products/SN754410NE/296-9911-5-ND/380180
15:58 rue_house thats ok,if you find a brainless driver you can operate 3 motors with it
15:59 zhanx its 2.14 a chip thats cheap
16:00 rue_house I cant see it, whats the dk number
16:00 zhanx 296-9911-5-ND
16:01 zhanx then check 296-9518-5-ND
16:03 rue_house oh my!
16:03 rue_house 1 sec
16:03 rue_house TLE5205-2IN-ND
16:03 rue_house not cheap tho
16:03 zhanx no its not
16:04 rue_house whats tthe vsat of the 754410 tho?
16:06 zhanx maybe i am blind but not seeing it in the datasheet
16:07 rue_house ah, its about 2.2V drop across the driver
16:07 rue_house VOH and VOL
16:07 rue_house upwards of 4V depending
16:07 rue_house yea, at 1A you lose 4V
16:08 zhanx only using 500ma
16:08 rue_house iirc the 293 is worse, thats why I hate it
16:08 zhanx k
16:08 zhanx soo.. i will get a pair of each to test and just 1 tle5205-2in-nd
16:09 rue_house hold on
16:09 rue_house I'm going thru another list
16:09 zhanx wait the tle5205-2in is a non stock outdated item
16:09 rue_house this one loses 3V at 1A
16:09 rue_house http://www.toshiba.com/taec/components2/Datasheet_Sync//261/3592.pdf
16:09 rue_house its cheaper tho
16:11 rue_house the FAN8200 was awesome
16:12 rue_house wait BLDC
16:12 rue_house damn
16:13 rue_house are you willing to go smt?
16:14 zhanx yes to TSSOP
16:14 rue_house hmm
16:15 rue_house well that could send me on another few hours search
16:15 zhanx maybe UFDFN but i dont have an oven
16:15 rue_house 1A range?
16:15 zhanx 1a-2.5max
16:15 zhanx i thinking i will get a couple to test out
16:17 zhanx the write a review
16:17 zhanx after i get them in i will make a test circuit fro each one and we can decide tests to conduct and figure out the best one over all
16:17 rue_house OH!
16:18 rue_house wtf...
16:19 rue_house http://www.aosmd.com/res/data_sheets/AOP605.pdf fet half bridge, 8 pin dip, 43mR at 5V
16:19 zhanx TA7291PO-ND
16:20 rue_house 1A is .043V
16:20 rue_house so your under .1V drop across a bridge
16:20 rue_house its a bit space hungry cause you need 4 of them... but....
16:21 rue_house not expensive
16:21 rue_house $4 for two motor drivers
16:21 rue_house you dont need drivers cause you can run it on 5V
16:22 rue_house I think thats a winner
16:23 rue_house you might want to throw a pn2222 and pullup at is to do Vbat -> 0 driving on the gate
16:24 rue_house zhanx, ?
16:27 zhanx food is here brb and i said that day one you said no
16:33 zhanx added the np2222 to the list for the test
16:33 zhanx watch it win
17:01 zhanx ok i think i will go with the TA7267BP5-ND
17:47 rue_house http://search.digikey.com/ca/en/products/AOP605/785-1140-5-ND/1855912 <-- did you check those out!!!
17:47 rue_house ???
17:48 rue_house their fine for low voltage!!!
18:25 zhanx fine i will get them but your gonna have to help wire them up the data sheet sucks
18:25 rue_house you just make a bridge, its easy
18:25 rue_house I'll show ya
18:26 zhanx k added to my order, better get some diodes then
18:26 rue_house didn't they havebuilt in?
18:27 zhanx nope
19:17 rue_house http://experimentaltvcenter.org/sites/default/files/history/images/preservationcom/8pin2.jpg
20:46 iamturnip rue_house: ok cat cant mess around with this computer now
20:46 rue_house ?
20:46 iamturnip Intel imac... running debian ofcourse1
20:46 iamturnip but no heatsource to be attarcted to
20:47 iamturnip no joy sitting on a cold plastic keyboard
20:48 rue_house heh
20:49 iamturnip i have a pretty killer setup now...but i feel guilty since its way over kill for what i do
20:50 iamturnip Core 2 duo 20" imac running stumpwm with a 24" HD monitor for extra space
20:50 iamturnip so I have iceweasel on 24" and irc on the 20"
20:51 iamturnip it only took me a hour to get all the appley shit running in debian .. like isight and the wireless pretty amazing how far debian has come