hybridfree/eevblog-posts huggingface dataset:
[OT ATLANTIS last take off - Page 1
Forum section: electronics / general

author: ElektroQuark
author_rank: Unknown
timestamp: July 08, 2011, 01:03:24 pm
content: You can see it here:http://www.nasa.gov/multimedia/nasatv/index.htmlLIVE from NASA.The last flight of the Space Shuttle saga. The End of an era.

author: Kiriakos-GR
author_rank: Super Contributor
timestamp: July 08, 2011, 02:47:24 pm
content: Yes they do not need it any more, they had so many spying birds on the orbit,that soon enough they will start crashing by them self's. ( No room for more )

author: PeterG
author_rank: Frequent Contributor
timestamp: July 13, 2011, 08:23:05 am
content: Just some interesting live stats of the Space Station Orbit.http://www.n2yo.com/Regards

author: ElektroQuark
author_rank: Unknown
timestamp: July 13, 2011, 09:59:50 am
content: Interesting, thank you.I would thought that this topic would have many post in a "tech" message board like this, but it is not the case. I'm surprised.

author: deephaven
author_rank: Frequent Contributor
timestamp: July 13, 2011, 11:34:53 am
content: Quote from: PeterG on July 13, 2011, 08:23:05 amWhat a brilliant website - thanks!

author: westfw
author_rank: Super Contributor
timestamp: July 23, 2011, 10:41:22 pm
content: I was going to comment on how depressing it was for the US to have lost its manned space capability for the "1st time since I was a child", but it looks like there was a pretty big gap in between the last Saturn Launch (skylab, 1974) and the 1st shuttle launches (1981) too.AFAIK, most of the spy satellites go up on non-shuttle boosters.
How to change time zone? - Page 1
Forum section: electronics / general

author: sean87
author_rank: Regular Contributor
timestamp: July 21, 2011, 08:49:38 am
content: Hi eevblogers,I was trying to find an option to change time zone with no success. (I think SMF also got this feature but maybe it is disabled in this forum in that case it is racisem). Any idea how to do it?

author: PeterG
author_rank: Frequent Contributor
timestamp: July 21, 2011, 09:09:52 am
content: There is a Timezone Offset setting in your profile settings.Regards

author: patb
author_rank: Regular Contributor
timestamp: July 21, 2011, 10:40:25 am
content: It is a little bit hidden.See attached image.BR

author: sean87
author_rank: Regular Contributor
timestamp: July 21, 2011, 10:59:05 am
content: Quote from: patb on July 21, 2011, 10:40:25 amThanks man you saved my life!
cheap pcb panels/large pcb? - Page 1
Forum section: electronics / general

author: implor
author_rank: Regular Contributor
timestamp: July 19, 2011, 07:27:25 pm
content: I'm doing a projekt where I need a few big PCB, so i'm wondering if any one knows of a place like ITeadstudio but do bigger size pcb? (say >30x30cm).

author: gregariz
author_rank: Frequent Contributor
timestamp: July 19, 2011, 09:04:31 pm
content: Quote from: implor on July 19, 2011, 07:27:25 pmI think its best you email them and ask for an individual quote. They seem to subcontract alot of their work out to each other.

author: onemilimeter
author_rank: Frequent Contributor
timestamp: July 20, 2011, 01:23:27 pm
content: Try this link:http://www.emz-circuitistampati.it/
Don't just fake the product, fake the whole store! - Page 1
Forum section: electronics / general

author: Hypernova
author_rank: Unknown
timestamp: July 20, 2011, 04:37:56 pm
content: http://birdabroad.wordpress.com/2011/07/20/are-you-listening-steve-jobs/Fake Apple Stores take the art of counterfeiting to a whole new level.

author: Unknown
author_rank: Unknown
timestamp: July 20, 2011, 06:19:58 pm
content: Just a store ?How about a whole village?http://www.msnbc.msn.com/id/43449348/ns/world_news-asia_pacific/t/chinese-copy-austrian-village-stirs-emotions/

author: ivan747
author_rank: Super Contributor
timestamp: July 20, 2011, 06:24:01 pm
content: Is my only thought

author: vk6zgo
author_rank: Super Contributor
timestamp: July 22, 2011, 03:05:59 am
content: It happens in the best of families!When I was very young,I had some clockwork toys proudly labelled:-MADE IN U.SZone,Germany.The latter bit in tiny letters.This scam only lasted a short while,as when the FDR & DDR were formed,the term "Zone" lost its meaning.Things were very tough in Germany at the time,so I guess they thought anything which would get a few more sales was worth it.Then there was the little town of USA in Japan (Probably an urban myth,but it was a good story)I am old enough to remember the term"Jap Crap".VK6ZGO

author: saturation
author_rank: Super Contributor
timestamp: July 22, 2011, 11:52:54 am
content: This story has made it to Reuters and the major news agencies.
Thai PCB service - Page 1
Forum section: electronics / general

author: gregariz
author_rank: Frequent Contributor
timestamp: July 18, 2011, 10:52:55 pm
content: Anyone used these guys?http://www.warapcb.com/2011/pcb-order/order-online-prototype$79 for a 8x11" panel seems pretty good

author: Jimmy
author_rank: Regular Contributor
timestamp: July 19, 2011, 02:42:29 am
content: What currency?Looks good to me

author: gregariz
author_rank: Frequent Contributor
timestamp: July 19, 2011, 03:52:11 am
content: Quote from: Jimmy on July 19, 2011, 02:42:29 amMy guess would be $US so should be better in Aus.... its only single sided though

author: onemilimeter
author_rank: Frequent Contributor
timestamp: July 19, 2011, 11:45:50 am
content: Quote from: gregariz on July 19, 2011, 03:52:11 amDouble-sided - $139

author: ciccio
author_rank: Frequent Contributor
timestamp: July 19, 2011, 04:45:48 pm
content: One panel is 550 cm2, and the price is interesting.It's about 98 euro, that means 0.18 euro per cm2.Adding custom duties (in Italy about 20-22 %) will bring this to 0.22 euro.How much the delivery?My supplier, here in Italy, has a "forfait" price of of 220 euro for 0 to 2000 cm2, or 250 euro for 2500 cm2, including film plotting, for dual sided FR4 1.6 mm, dual 35 micron copper, silk screen, test and lead-free finish, with 3-5 working days delivery. This means that unit cost is 0.11 - 0.10 euro per cm2 (it's obvious that the quantity is higher but, if there are no serious mistakes, I usually can sell a first run of prototypes...)They have also a cheaper service, but it's "single use": the second time you have to pay again for plots.A friend tells me that there are even cheaper suppliers, but I prefer to refer to mine: they are about 15 km from me, and if there is a problem, it can be easily solved, face to face.Their website ishttp://www.emz-circuitistampati.it/.Funny thing: Italy cheaper than Thailand...

author: gregariz
author_rank: Frequent Contributor
timestamp: July 19, 2011, 05:35:12 pm
content: Quote from: onemilimeter on July 19, 2011, 11:45:50 amI think Gold Phoenix should be cheaper for a Double sided panel
Ever wondered how electric bike wheels are assembled? - Page 1
Forum section: electronics / general

author: Kiriakos-GR
author_rank: Super Contributor
timestamp: July 21, 2011, 09:09:50 am
content: Something interesting and fresh .I do some thinking about the possibility to convert my bicycle in to e-bike.http://www.pedelecs.co.uk/content.php?r=457-Ever-wondered-how-electric-bike-wheels-are-assembled

author: Lawsen
author_rank: Frequent Contributor
timestamp: July 23, 2011, 07:13:30 pm
content: I own a Bike E AT. The Bike E recumbent is very popular platform to convert to an electric bicycle. I chose not to convert it to electric motor assists. The important task to convert a bicycle to electric is to make certain that all the components fit the frame and the rider is still able to reach the controls and maintain balance when riding in both pedal powered and electric motor assists. It is challenging to convert a skinny tires racing road bicycle to electric, because fork and rear stays tire clearance will not allow enough room to accommodate the electric motor. The battery box is a bit heavy for the carbon fiber frame. The bicycle will not be allowed in races, if we add an electric motor into the drive chain. I see most hybrid street or mountain bicycle being converted to electric motor assists.

author: Kiriakos-GR
author_rank: Super Contributor
timestamp: July 23, 2011, 09:15:59 pm
content: I am doing some thoughts to use one of those 250W wheels.And convert one normal bike in to a e-bike, by loading the batteries at the back .The problem is that some one in my town asked for 170 EUR for just the rear wheel.That is a standard bike wheel with the motor at the center, ready to accept common Shimano sprockets.I have many questions about this subject, like how you can tell how effective it can be one wheel from another ?They all look the same.Even so , some they sale them at prices like to was made from gold.

author: RayJones
author_rank: Frequent Contributor
timestamp: July 24, 2011, 01:17:22 am
content: Far too labour intensive.Not a motorised hub, but check out from 7:20 on this videoThe handle bars are cool too, starting around 4:00.The whole video is good to watch.
Looking for 2D MEMS tilt mirror devices - Page 1
Forum section: electronics / general

author: AntiProtonBoy
author_rank: Frequent Contributor
timestamp: July 19, 2011, 08:48:46 am
content: I am investigating 2D MEMS tilt mirror devices for a research project. Those who are not familiar with MEMS devices, they are integrated circuits that contain features consisting moving parts. The moving parts are actuated either via electrostatic means, or via magnetic interaction.The delicate structure of MEMS tilt mirrors is either etched or cut into silicon substrate, which consists of a see-saw like mechanism along two axes (silicon torsional bars), and they flip back and forth very rapidly in 2D. Such devices can be used to generate 2D scanning patterns for reflected laser light, etc. One typical example how the part looks like is shown on this site:http://www.memsoptical.com/prodserv/products/twotiltmir.htmTilt mirrors are also used in those really cool RGB laser pico projectors, such as the Microvision device featured on Mike's youtube channel:My research project focuses on real-time image processing; and the viability of 2D scan based imaging in the infra-red and thermal wavelengths. I’m looking for a scanning mirror device with good reflectivity for wavelengths in the 1000 ~ 3000 nm range.I have approached a half a dozen manufacturers specialising in those devices, asking them about engineering samples, or evaluation kits. Unfortunately, they either responded with non-committal answers, or did not want to know me. That was half expected, but still ... very disappointing.Only Opus Microsystems responded, stating they have evaluation kits available, but unfortunately their MEMS device cost about $1000 each(!) and their eval board $500 each(!!). It's crazy, the boards didn't even look all that special, probably uses a handful of micros via a RS-232 interface. You can see a demo of that below:Anyway, those aforementioned Microvision projectors cost about $500 all up, so those MEMS devices can't be all that expensive! I was wondering whether anyone dealt with MEMS mirrors before, and know where I could source some at reasonable prices? In case you need specs, in need something that is capable of running at 18 kHz and 1 kHz for horizontal and vertical scans respectively.Oh yeah, and "hi", 1st time poster and all that...

author: trevyn
author_rank: Newbie
timestamp: July 19, 2011, 10:46:57 am
content: Avnet appears to have 2 of TI's TALP1000B in stock, at the bargain price of $444.10.They also list the cheaper TALP3001 as purchasable in single quantity, but with no stock. (It's a single-axis, though.)
Goodluckbuy.com -- any experiences? - Page 1
Forum section: electronics / general

author: RCMR
author_rank: Frequent Contributor
timestamp: July 13, 2011, 11:17:28 am
content: I've bought a bit of stuff from GoodLuckBuy.com and, apart from a slightly dinged-up bench power supply, it's been okay.My last order was to try out their components so I ordered a bunch of SMD resistors and capacitors, a few bags of transistors, voltage regs, solder-paste, heat-shrink, 555 timers, etc and some dial calipers.The dial calipers were crap (really, really bad!) -- the rack was munted, they were full of dirt, scratched and sloppy as hell -- but they gave me a credit for that.The bigger problem was that quite a few of the ordered items (including a $46 signal generator) were missing from the order.I contacted them and they said "all sent" but the bag was unopened on arrival and there was definitely stuff missing.It was a $200 order and about $60 worth of it was not in the consignment that arrived.I'm thinking that they're just not geared up for orders containing more than one or two items and have no actual print - pick - pack process in order.After some discussion, they said they'd send out the missing bits -- and I'll give them the benefit of the doubt until I see otherwise.However, just a little heads-up in case anyone else was thinking of taking a shopping list along to the site.I'll keep folk informed as to the outcome, if anyone's interested.

author: stl
author_rank: Contributor
timestamp: July 13, 2011, 01:18:12 pm
content: I've bought some stuff from that store, among them two Uni-T voltage detectors. They sent the wrong model, I complained, send a photo, and they gave me a full refund for the two detectors. Although they made a mistake they promptly fix it.

author: amigo
author_rank: Regular Contributor
timestamp: July 14, 2011, 12:22:16 am
content: I bought a Hantek DSO5102B from them in Dec. 2010 and it arrived fine and in good shape. Have not gotten anything from them since then, but maybe things changed on their end ie. they got more "cheapish" than they used to be.

author: Scrts
author_rank: Frequent Contributor
timestamp: July 17, 2011, 08:58:03 pm
content: I've got two DSO5102B scopes bought separately in 3 months. One of them had ADC heatsink lost and another had some screw jumping inside, which I removed by unscrewing the DSO.
UT61E problem - Page 1
Forum section: electronics / general

author: expert92
author_rank: Newbie
timestamp: July 17, 2011, 05:33:26 am
content: i am using ut61e multimeter and there is a problem when i am trying to measure an AC volt that the lcd shows up to 3 volt when i am changing the range of the multimeter (nothing connected) then it reduced to 0.3 volt then (after50 seconds ) to 0.03 then slowly to zero !and the problem happens only with measuring AC values but when i measure an power supply for example it told me 120 volt (true value no problem) so i don't know if there is a problem with the multimeter or not(i noticed that the value is changing very quickly when i move the cables of the multimeter)please help !

author: pablo
author_rank: Contributor
timestamp: July 17, 2011, 06:58:50 am
content: that's a true RMS multimeter and in a true RMS multimeter most of the time it displays a value different from zerowhich is pretty normal, doesn't matter if you got nothing connected to your test leads.That's an offset for compensation purposes.
Motor Encoder - Page 1
Forum section: electronics / general

author: SuperMiguel
author_rank: Regular Contributor
timestamp: July 16, 2011, 09:16:12 pm
content: What are motor Encoder for? whats the function of it?

author: Sionyn
author_rank: Frequent Contributor
timestamp: July 16, 2011, 10:33:29 pm
content: ah that a rotary encoderdc motor i take ithttp://en.wikipedia.org/wiki/Rotary_encoder

author: Lance
author_rank: Frequent Contributor
timestamp: July 16, 2011, 11:06:55 pm
content: That's pretty much it. They're used for tracking the rotation of a motor.

author: SuperMiguel
author_rank: Regular Contributor
timestamp: July 16, 2011, 11:16:53 pm
content: why would u want to track it?

author: ndictu
author_rank: Regular Contributor
timestamp: July 16, 2011, 11:20:49 pm
content: You have a motor driving your robot and you want to go 1 meter forwards and then turn 45 degrees. You need some kind of feedback because the actual time you need to keep motors on will change based on battery level, weight, surface etc.

author: SuperMiguel
author_rank: Regular Contributor
timestamp: July 17, 2011, 12:20:11 am
content: gotcha

author: tecman
author_rank: Frequent Contributor
timestamp: July 17, 2011, 12:49:12 am
content: Encoders are used for measuring the angle (aka distance) on motors, but on certain types of brushless AC motors, they are used as well to control commutation. Adding an encoder to a vector drive can improve low speed operation and decrease coging. AC servo motors (permanent magnet types) also use encoders for precision movements and commutation.paul

author: nyo
author_rank: Contributor
timestamp: July 17, 2011, 09:04:09 pm
content: Correct me if I'm wrong, but the simplest data it can give you is rpm

author: bilko
author_rank: Frequent Contributor
timestamp: July 17, 2011, 09:20:31 pm
content: Usually, you can get position, direction, speed.A pc mouse (with roller ball) has two built in to control the cursor

author: Mechatrommer
author_rank: Super Contributor
timestamp: July 17, 2011, 10:58:00 pm
content: Quote from: nyo on July 17, 2011, 09:04:09 pmhttp://en.wikipedia.org/wiki/Rotary_encoderabsolute encoder is much more expensive than relative encoder, so i never work with absolute type. relative encoder you can use quadrature (binary encoding) or incremental, from there you can postprocess the parameters for rotation (relative to previous position/parameters) such as direction, angle, rate of change (speed or acceleration).
Rigol DS1052E officially in Greece for 299 EUR   - Page 1
Forum section: electronics / general

author: Kiriakos-GR
author_rank: Super Contributor
timestamp: July 11, 2011, 10:41:02 pm
content: Just got an Newsletter from the the Greek " Netscope Solutions " that they had just signed an agreement about the official distributionof the products made by the RIGOL Technologies.( " Netscope Solutions " is the main partner of Agilent too, few months back become Fluke partner too,and now Rigol )And so..Rigol DS1052E in Greece for 299 EURThree years warranty.Free shipping anywhere in Greece.http://www.netscope.gr/SearchTableLookUp.aspx?TableId=92&Val=707636Great news, now I need a sponsor, so to get one too.

author: firewalker
author_rank: Super Contributor
timestamp: July 12, 2011, 02:22:18 pm
content: Really Great news!Alexander.

author: Lawsen
author_rank: Frequent Contributor
timestamp: July 12, 2011, 10:54:38 pm
content: Kiriakos:That is the best news for those in Greece. America is slumping further and large companies are leaving California, which is not good news for me. The average price for a Rigol 1052E is $399.00 USD here, mail order through E Bay. There are refurbished 2 channels equivalent Agilent for $450.00 USD. I enjoy the Rigol very much and have one in my room. You could try other Rigol stuff like function generator and multimeters bench top units.Lawsen

author: firewalker
author_rank: Super Contributor
timestamp: July 16, 2011, 10:54:03 am
content: The 299 € iswithouttaxes. The value with taxes (23 %) is367.77 €.

author: saturation
author_rank: Super Contributor
timestamp: July 16, 2011, 02:51:51 pm
content: Why eBay when many authorized dealers like tequipment sell it for the same price, and often can include free shipping ?This new pricing from China is fantastic, but beware, see the threads of A Hellene and others about problems with newer 1052e build quality: noise and screen issues. It would be wise to have a way to refund your purchase easily or exchange for a better unit.Quote from: Lawsen on July 12, 2011, 10:54:38 pmQuote from: Squonk on July 16, 2011, 12:44:50 pm
Instek GDS-1102A Oscilloscope - Page 1
Forum section: electronics / general

author: ngkee22
author_rank: Regular Contributor
timestamp: May 08, 2011, 01:59:40 am
content: I saw on Tequipment.net that they had the 100Mhz GDS-1102A on sale for $577. I think it is a good price, has the opinion of this model improved on here over the Rigol scopes?http://www.tequipment.net/InstekGDS-1102A.htmlThanks

author: Bored@Work
author_rank: Super Contributor
timestamp: May 08, 2011, 11:34:43 am
content: I think the opinion about Instek oscilloscopes here was always high. And my opinion certainly is. Except maybe the new GDS-3000 series, which might be to expensive, comparing its features with the features of the new Agilent oscilloscopes.Don't get confused by the Rigol crowd. They are just shouting loud and stroking their dicks because of the hack to enhance the bandwidth.

author: ngkee22
author_rank: Regular Contributor
timestamp: May 31, 2011, 08:47:58 pm
content: I finally bought the GDS-1102A Oscilloscope for $550. So far, everything looks to be working right. The manual seems to be fairly informative, I hadn't time to read a lot of it though.Now I just need something to do as soon as I get time from my busy job.I will let everyone know what I think later on, though, don't plan on a full review. That is probably out of my league for now, I will leave those up to the professional, Dave.

author: Fast.Eddie
author_rank: Newbie
timestamp: July 15, 2011, 06:05:14 pm
content: Where did you find the GDS-1102A for $550?

author: cybergibbons
author_rank: Frequent Contributor
timestamp: July 15, 2011, 08:44:49 pm
content: I have a GDS-1152A and I am on the whole very happy with it. It does most of what I need quite well. It's better than the Rigol as far as I can tell.My four major complaints are:1. Storing the 2Mpoints of memory onto SD card takes 15 minutes. This is painful. I was doing analysis of some long signals and had to do this many times.2. PC software is rubbish.3. There's no decent window zoom feature like on the Rigol. Really annoying with the 2Mpoints memory.4. Something about the trigger offset and window position always means I move the trigger offset and not move the window.I know it is missing some features, like go/no-go, but I don't miss them.

author: ngkee22
author_rank: Regular Contributor
timestamp: July 15, 2011, 09:48:53 pm
content: I got it on Tequipment.com. At the time there was a coupon for 5% more off of their $577 price. It was CHAT5, it may still work. I used it when they were not advertising it.
Battery - Page 1
Forum section: electronics / general

author: SuperMiguel
author_rank: Regular Contributor
timestamp: July 13, 2011, 11:45:58 pm
content: I just got this battery:http://www.batterymart.com/p-12v-7ah-sealed-lead-acid-battery-f2.htmlI also got a battery charger, but it doesnt have indication lights.. How can i tell when the battery is fully charged?Thanks

author: Kiriakos-GR
author_rank: Super Contributor
timestamp: July 13, 2011, 11:51:03 pm
content: I need to see a picture of this charger ... before I say anything more.(800x600) will be fine.

author: SuperMiguel
author_rank: Regular Contributor
timestamp: July 13, 2011, 11:57:48 pm
content: Quote from: Kiriakos-GR on July 13, 2011, 11:51:03 pmlol i knew someone would ask for it.. the trust is that it does have indicator light for full charge, but the light went out, and dont have any leds to replace it.. waiting on shipment will get here tomorrow.. but mean while is there a way to tell whether or not the battery is fully charged?

author: Kiriakos-GR
author_rank: Super Contributor
timestamp: July 14, 2011, 12:14:06 am
content: If the battery gets removed from the charger and one hour later measures 12.6V or above its full.

author: SuperMiguel
author_rank: Regular Contributor
timestamp: July 14, 2011, 12:36:21 am
content: Quote from: Kiriakos-GR on July 14, 2011, 12:14:06 amwith no load at all?

author: ipman
author_rank: Regular Contributor
timestamp: July 14, 2011, 05:34:50 am
content: No load, just put the multimeter on it to measure voltage.

author: stl
author_rank: Contributor
timestamp: July 14, 2011, 09:12:34 am
content: Typically a lead-acid battery is charged when the charging current is about 2% of the battery A/H rating, in this case 2% of 7A/H = 140mA

author: Kiriakos-GR
author_rank: Super Contributor
timestamp: July 14, 2011, 11:49:16 am
content: Quote from: SuperMiguel on July 14, 2011, 12:36:21 amYes no load.And do not forget that in this battery there is many individual cells in line.
Who in the US can do me a favor this Sunday? (iRiver Story HD) - Page 1
Forum section: electronics / general

author: EEVblog
author_rank: Unknown
timestamp: July 13, 2011, 05:43:46 am
content: The new iRiver Story HD Google ebook reader is coming out this Sunday in Target stores across the US, and I want one to do a review and play withProblem is I believe it's only available in Target stores in the US? Won't be in Australia for another month or so I believe.So would there be anyone in the US willing to get one for me this Sunday and Fedex on Monday? (all expenses paid of course)ThanksDave.

author: dimlow
author_rank: Frequent Contributor
timestamp: July 13, 2011, 08:30:08 am
content: All expenses paid ? OMGOk im in the uk, but if you pay my expenses i will pop on the next jet over and go collect one for you and deliver it to your door!But seriously, cant you wait a month ?

author: Joshua
author_rank: Regular Contributor
timestamp: July 13, 2011, 02:24:44 pm
content: I wouldn't mind, but the nearest target is about an two hours away I think. However, it is a possibility that I might already be heading that way next Wednesday. If so, I might could do it then. However, don't get too excited because all of this is up in the air.

author: FreeThinker
author_rank: Frequent Contributor
timestamp: July 13, 2011, 03:19:45 pm
content: Searched all over but Amazon don't seem to stock it!

author: Armin_Balija
author_rank: Regular Contributor
timestamp: July 13, 2011, 03:46:43 pm
content: USD. $140.00I have a Target about half a mile down the road from me. Is it supposed to be a hot item this year?

author: Time
author_rank: Frequent Contributor
timestamp: July 13, 2011, 05:28:32 pm
content: I'll do it if no one else can.

author: Armin_Balija
author_rank: Regular Contributor
timestamp: July 13, 2011, 07:43:25 pm
content: Yeah, I'd try to do it in a timely manner as well just wanted to make sure there'd be no time delay if it was an item I'd have to wait outside for or something.Let me know if you need anyone or if you've found someone.
ENKEI valve stems VS Rubber common stuff ( Car-moto)  - Page 1
Forum section: electronics / general

author: Kiriakos-GR
author_rank: Super Contributor
timestamp: July 08, 2011, 10:54:17 pm
content: Long time ago I had replace the tires of my motorcycle with new.The technician in the garage who installed the new tires in my aluminum rims,he also replaced the valve stems.Soon enough I realized that he did the mistake to add a new rubber valve stem at the front wheel ,and a used one in the back wheel.The one in the back wheel had signs that it would had an sort life,even if I did complained about it, I got the classic answer, no worries it will last for long.This was before two years time.Even so I did search and buy from ebay ( USA) the best ones out there,as long lasting high quality 3/4 inch short valve from Enkei ( 4$ its one) .And I had them in storage for about two years.Today I tried to inflate the real wheel and as soon I touched the rubber valve it broke off !!and stayed in my hands.I was ready to get mad, but them I said .. Thanks God that it did not happen else-ware than in front of my shop,so to have more troubles , or even an accident in the street.I just removed both wheels, and I have the new valves in my hands too,all that I need to do is to wait few hours until the shops to open,so to have them installed, I can no do it by my self, those tubeless tires are impossible, to come off by hand.If you have any stories to share about those aluminum or rubber valve stems,be my guest.

author: Kiriakos-GR
author_rank: Super Contributor
timestamp: July 12, 2011, 04:16:02 pm
content: ENKEI valve stems on ...No more cheap rubber stuff !! and stupid accidents with valves.

author: ipman
author_rank: Regular Contributor
timestamp: July 12, 2011, 04:31:05 pm
content: Never had problems like these with my bike (also Honda, model CBR1100XX). A set of valves was used for 3 years, did not had any problems, replaced them along with the used tyres, as the service guy told me this is "best practice" and did not charge anything more.Anyway, can't vote something on your list, because every one owned, car or byke, did their job as they were supposed.

author: Kiriakos-GR
author_rank: Super Contributor
timestamp: July 12, 2011, 06:35:04 pm
content: Well as long you own a motorcycle I wish you to never see this picture ever ...The motorcycles does not have a spare wheel.

author: ipman
author_rank: Regular Contributor
timestamp: July 12, 2011, 07:16:28 pm
content: The spare wheel of motorcycles are cars with a motorcycle trailer
Tapatalk - Page 1
Forum section: electronics / general

author: Chet T16
author_rank: Frequent Contributor
timestamp: June 29, 2011, 10:26:39 am
content: Any chance of getting Tapatalk installed on here? I don't know about SMF but its a very simple install on vBulletinhttp://www.tapatalk.com

author: disten
author_rank: Newbie
timestamp: July 11, 2011, 10:25:08 am
content: tapatalk is a great app, i often read this forum with my android and i also have tapatalk installed on my phone, so it would be realy great.

author: EEVblog
author_rank: Unknown
timestamp: July 11, 2011, 12:11:59 pm
content: Installed!Technically they don't say it support SMF 2.0, just the RC versions.Dave.

author: Chet T16
author_rank: Frequent Contributor
timestamp: July 11, 2011, 01:42:53 pm
content: Awesome, replying from it now!
How to find old chips? - Page 1
Forum section: electronics / general

author: Lightages
author_rank: Unknown
timestamp: July 09, 2011, 02:03:41 am
content: I posted in the buy/sell/wanted section that I was looking for some memory chips but have had no replies yet. I have an LCD monitor that uses a memory chip ML12L16161A-5T, that is made by Elite Semiconductor Memory Technology Inc. It appears that there a a few substitutes available such as IS42S16100C1-5T made by Integrated Silicon Solution, Inc., or EM636165TS-5 made by EtronTech, or K4S161622E-TC50 made by Samsung, or GM72V161621 by Goldstar, and who knows who else.My question is: How do I find qny supply of these parts? I know they ESMT parts were used in some NVidia GeForce cards in the past. Perhaps these SDRAM chips were also used in SDRAM modules for computers too.I hope someone can point me to a place to buy these or perhaps someone has these chips on a video card lying around.Thanks for any help! I do not want to throw away a beautiful monitor (IPS) just for two lousy memory chips.

author: gregariz
author_rank: Frequent Contributor
timestamp: July 09, 2011, 02:12:15 am
content: I have used these guys a couple of times... no problems so farhttp://www.americanmicrosemi.com/home/

author: Lightages
author_rank: Unknown
timestamp: July 09, 2011, 05:42:22 am
content: Yay! They have one in stock!I need a minimum of twoThanks for the pointer.
Soldering station topic revived - Page 1
Forum section: electronics / general

author: img
author_rank: Regular Contributor
timestamp: July 12, 2011, 10:18:19 am
content: There was a useful discussion on soldering stations sometime this April (Pace, Metcal, JBC grade vs. 'the others'). Sadly it was too short; I would have liked it go on, and on, and on...I'd like to ask people on this forum to comment on their rework stations and soldering irons, but please also indicate what are you soldering/reworking and how long do you spend daily doing this. For example, saying something like 'I have an Antex and it's been great for 10 years' isn't very useful because you could be soldering 5 caps a year.Personally, I am interested in JBC-related info. I am currently eyeing and drooling over their RMST and would be grateful for any additional practical info I can get.
Poll: uA range on DMM - Page 1
Forum section: electronics / general

author: Nermash
author_rank: Frequent Contributor
timestamp: July 07, 2011, 12:45:18 pm
content: Either my projects are power hogs (my last one uses 150 mA, but it is a web server on a PIC mcu), or generally people rarely use this range?

author: saturation
author_rank: Super Contributor
timestamp: July 07, 2011, 01:00:42 pm
content: I work specifically in low power low voltage. If you run hand held items with batteries of any sort, uA is fairly common. For example, if you measure the power consumption of your DMM, once a gross measurement is made in the mA mode, the burden voltage will cause more inaccuracy, switching to the uA will improve the accuracyswitching to uA give's more resolution, taking the effect of burden voltage into account.

author: Unknown
author_rank: Unknown
timestamp: July 07, 2011, 05:02:30 pm
content: Quote from: saturation on July 07, 2011, 01:00:42 pmHow's the higher resistance shunt of the uA range going to reduce the error caused by burden voltage?

author: Kiriakos-GR
author_rank: Super Contributor
timestamp: July 07, 2011, 08:31:09 pm
content: I never cared that much about accuracy in uA .The most that I would ever care , even for battery consumption tests with AA or AAA,would be in mA range. (milliAmpere).

author: ejeffrey
author_rank: Super Contributor
timestamp: July 07, 2011, 10:04:55 pm
content: I rarely use microamps readings from a DMM. Milliamps is usually enough for supply currents and so forth, otherwise I usually need nanoamps for measuring sensor currents, and use a purpose built transimpedance amplifier.

author: mzacharias
author_rank: Frequent Contributor
timestamp: July 08, 2011, 12:10:59 am
content: Mostly use uA range when fooling around with multimeters, not much else. I do sometimes measure AC standby current drain in consumer devices but even the greenest of those are in the low milliamp range. BTW my best meter for that is the Tek TX-3. It switches seamlessly from microamps to amperes without the need to reposition the test lead plugs.

author: NiHaoMike
author_rank: Super Contributor
timestamp: July 08, 2011, 04:24:06 am
content: I don't use it very often but my friend Brittany Benzaia would use it several times a day measuring the current draw of low power microcontrollers and the standby current of battery operated devices.

author: ejeffrey
author_rank: Super Contributor
timestamp: July 08, 2011, 12:59:25 pm
content: Quote from: saturation on July 08, 2011, 11:46:44 amThe burden voltages are specified at the top of the current range. 1 milliamp of current will generate less burden voltage on the 30 milliamp range (with a shunt resistor of 1 ohm) than on the 3000 microamp range (with a shunt resistor of 100 ohm).

author: saturation
author_rank: Super Contributor
timestamp: July 08, 2011, 07:16:50 pm
content: Thanks ejeffrey and alm, you guys are right, my post isn't right, corrections made.Quote
CERN launches Open Hardware initiative - Page 1
Forum section: electronics / general

author: Sionyn
author_rank: Frequent Contributor
timestamp: July 07, 2011, 03:02:25 pm
content: coming along nicely i for one am fed up non disclosure agreements just for look at data sheetshttp://press.web.cern.ch/press/PressReleases/Releases2011/PR08.11E.html

author: ndictu
author_rank: Regular Contributor
timestamp: July 07, 2011, 09:54:27 pm
content: From the title I was hoping they were releasing LHC schematics so everyone can build one in their basement.

author: Mechatrommer
author_rank: Super Contributor
timestamp: July 08, 2011, 02:36:51 am
content: Quote from: ndictu on July 07, 2011, 09:54:27 pmyou need a basement the size of a big city.

author: ipman
author_rank: Regular Contributor
timestamp: July 08, 2011, 06:47:33 am
content: And some funding, similar to a country's budget

author: jahonen
author_rank: Super Contributor
timestamp: July 08, 2011, 10:19:33 am
content: Quote from: ndictu on July 07, 2011, 09:54:27 pmFor starters, you can read theLHC design reportto get some idea how to proceedRegards,Janne
Looking for a replacement for TL032A - Page 1
Forum section: electronics / general

author: onemilimeter
author_rank: Frequent Contributor
timestamp: July 06, 2011, 11:57:41 pm
content: Hi,A TL032A opamp is used at post isolation to convert the differential signal to single-ended (see attached figure,http://focus.ti.com/docs/prod/folders/print/tl032a.html). I'm looking for alternative parts (preferably in DIP package and is available from Farnell/RS/Mouser) with better performance to replace the TL032A. I'm not familiar with the opamp part# in the market and would be glad if you could recommend one or two.Cheers.

author: Bored@Work
author_rank: Super Contributor
timestamp: July 07, 2011, 05:56:03 am
content: Quote from: onemilimeter on July 06, 2011, 11:57:41 pmWhat characteristic of the TL032A is not good enough for your application?

author: onemilimeter
author_rank: Frequent Contributor
timestamp: July 07, 2011, 03:07:38 pm
content: According to the datasheet of ACPL-790x, the output rise/fall time (typical) is 1.7us.Since Cadence Orcad v10.3 does not have the PSPICE model for TL032A, I choose TL082.The simulation results with TL082 (without/with C1/C2 capacitors) are attached.Note that the output rise/fall time is limited by the slew rate of TL082.The last figure compares the specs of TL082A and TL032A.Since TL082A's slew rate is approximately two times higher than the TL032A, it is expected that the output rise/fall time of the TL032A will be higher too.I'm looking for alternate parts (with better performance, e.g. higher slew rate than the TL032A and the TL082A, similar (or lower) input voltage offset to (than) TL032A, higher GBW (e.g. >10MHz), available in DIP package, etc.) to replace the TL032A.I hope that, with alternate op-amp, the post signal conditioning circuit will not "add" more rise/fall time to the input signal.

author: ejeffrey
author_rank: Super Contributor
timestamp: July 07, 2011, 03:50:24 pm
content: OP-27 -- transistor input, 8 MHz gain bandwidth, 2 volt/us, and 0.1 mV DC offset. Available as OP-37 uncompensated with much higher slew rate and GBW.OPA134 -- jfet input, 8 MHz gain bandwidth, 20 V/us slew rate, but a 2 mV DC offset. Available in dual and quad packages.There are many others. Go to any of the big analog chip makers and use their part search.
PSPICE Simulation: Ideal Opamp vs uA741 - Page 1
Forum section: electronics / general

author: onemilimeter
author_rank: Frequent Contributor
timestamp: July 07, 2011, 10:35:09 am
content: I wish to study the step response of the post signal conditioning circuit (differential to single-ended plus low pass filter) as shown in attached figure (Fig. 21). The differential output of the ACPL-790x is 0~2.5V (attached figure, Fig. 12). Since Cadence PSPICE Schematic (v9.1) does not have the PSPICE model for TL032A, I choose uA741. With ideal opamp model, the simulation result (see attached figure) looks ok. However, with uA741, the simulation result looks weird. Does anyone know why the outputs with ideal opamp and uA741 are so much different?Cheers.

author: saturation
author_rank: Super Contributor
timestamp: July 07, 2011, 12:26:21 pm
content: Because the 741 is not ideal, what you see are the simulated real world response.

author: ejeffrey
author_rank: Super Contributor
timestamp: July 07, 2011, 01:31:41 pm
content: I took a look at the uA741 data sheet, and looked under "slew rate limit." The typical slew rate is listed as 0.5 volts/microsecond and your triangle wave has a slope of around... 5 volts/ 10 microseconds.
A bunch of engineers and a shoe storage problem. - Page 1
Forum section: electronics / general

author: Kibi
author_rank: Unknown
timestamp: July 04, 2011, 05:20:10 pm
content: I am currently working on a construction site. There are many engineers working in the site office ranging from Radio / TV studio outfitters to wiremen, IT folk, AV engineers and broadcast engineers. Being a building site all personnel including visitors are required to wear Health and Safety attire including safety boots. The storage of the various different sizes of visitors shoes was becoming and issue. When the site office gets moved to a different part of the building, as it frequently does, transporting the shoes and keeping them as pairs was also a problem.The shoe storage solution needed to be large and preferably mobile.The engineers put their heads together and after a few minutes decided that this would be the best solution.A spare 42U rack, a few 1U shelves and a handful of cage nuts, job done. It's called - wait for it - the "Shoe Rack"Since we were never allowed to attach anything to the walls, it also doubles as a notice board.

author: Chet T16
author_rank: Frequent Contributor
timestamp: July 04, 2011, 08:03:44 pm
content: I was sure this was going to be a joke!

author: ipman
author_rank: Regular Contributor
timestamp: July 05, 2011, 04:49:52 am
content: It might not be a joke.I work in the telecom business and there are racks everywhere. They are used as storage frequently.

author: timbert
author_rank: Newbie
timestamp: July 05, 2011, 05:55:19 pm
content: I just wonder what the cost of something this is like. Plus if you had a group of engineers working on this, think of the development costs.I would have asked the administrative assistants; because most of them probably have a lot more pairs of shoes in their closets at home than would fit in this thing.

author: ipman
author_rank: Regular Contributor
timestamp: July 05, 2011, 06:45:32 pm
content: If that rack is there, it's quite probably that it was not purchased on purpose. Otherwise, you are right, the cost is outrageous.Anyway, administrative assistans should be more advanced!

author: Kibi
author_rank: Unknown
timestamp: July 05, 2011, 08:48:01 pm
content: Quote from: ipman on July 05, 2011, 06:45:32 pmSure, the rack was taken out of stock for this purpose. It has got a use in the real world, but by that time the project will be coming to an end and less people will be working on site, thus less shoes needed.So, the shoe rack is also environmentally friendly as 100% of it will be re-used without even having to be re-cycled.

author: ivan747
author_rank: Super Contributor
timestamp: July 06, 2011, 08:03:08 pm
content: Brilliant!
QP5519 mini LCD datasheet - Page 1
Forum section: electronics / general

author: Hobgoblin612
author_rank: Contributor
timestamp: July 06, 2011, 05:48:32 am
content: hey dave (or anyone) can you give me a link to the datasheet for the jaycar QP5519 16x2 character mini LCD that you used in your uCalc. I recently found one in a jaycar store and got it to play with. they no longer stock it and i cant find the datasheet anywhere.

author: PeterG
author_rank: Frequent Contributor
timestamp: July 06, 2011, 08:59:22 am
content: First page Google listed.http://celtekindustrie.wordpress.com/2008/09/01/jaycar-lcd-modules/It looks to be a good starting point.Regards
Cable Foolery Scam Daveland to the Rescue  - Page 1
Forum section: electronics / general

author: Sionyn
author_rank: Frequent Contributor
timestamp: July 05, 2011, 02:42:16 pm
content: here on retailers bluff on £100 hdmi cables and a Australian electronics firm none the lesshttp://www.pcpro.co.uk/news/368461/retailer-calls-rivals-bluff-on-hdmi-scam

author: saturation
author_rank: Super Contributor
timestamp: July 05, 2011, 03:08:13 pm
content: This is similar to the Monster Cable vs Blue Jeans Cable conflict.HDMI cables are more involved, but of similar tech in USB cables; I use $0.50 types on my rig, cost more to ship it to me!http://en.wikipedia.org/wiki/Monster_Cable_Products#Trademark_and_patenthttp://www.bluejeanscable.com/legal/mcp/index.htm

author: Sionyn
author_rank: Frequent Contributor
timestamp: July 05, 2011, 03:23:43 pm
content: indeed no need to specifics here you all up on that, interesting though a guess its like a tax on scientific ignorance

author: Chet T16
author_rank: Frequent Contributor
timestamp: July 05, 2011, 03:37:03 pm
content: I've seen gold plated toslink/optical cables for sale, made me laughI do have one "expensive" hdmi cable, they included it with my PS3 when my wife was buying it

author: timbert
author_rank: Newbie
timestamp: July 05, 2011, 08:59:45 pm
content: £100 for a cable? I thought that was hideous until I looked here in the U.S. Then I actually looked for the 'best buy' I could make on a cable--$1090!So, methinks those cheap £100 must be absolute crap. They probably don't have techno-babble features like "Critical Stable Geometry for high-quality audio and video signal transfer" or "solid long-grain copper for a strong signal."The last thing you need is for your short-grained copper cable's critical geometry to go all unstable.

author: Sionyn
author_rank: Frequent Contributor
timestamp: July 05, 2011, 09:19:56 pm
content: case in pointhttp://www.bestbuy.com/site/AudioQuest+-+Coffee+6.6%27+HDMI+Cable+-+Brown/Black/1267646.p?skuId=1267646&id=1218245470758#tabbed-customerreviews
making my own micro scalextric track - Page 1
Forum section: electronics / general

author: Simon
author_rank: Unknown
timestamp: July 04, 2011, 06:28:28 pm
content: I intend to build a very custom layout micro scalextric track. As I want a lot of very custom and odd bits I'd have to make at least some of my own track and so might as well make the whole circuit.Has anyone ever worked on micro scalextrix, I'm talking micro, not the standard size, there is lots of stuff on standard stuff but little on micro. my main concern is the power rails, what to make them with and how to hold them down

author: ipman
author_rank: Regular Contributor
timestamp: July 05, 2011, 04:55:38 am
content: I played with something similar when I was a kid.The power rails in the original version were made from nickel-plated copper or brass. It's not easy to manufacture this.They original tracks were plastic, and the power rails were fixed with dedicated slots underside the plastic track.Hope this helps.
New RS search - Page 1
Forum section: electronics / general

author: Unknown
author_rank: Unknown
timestamp: July 05, 2011, 10:26:31 pm
content: RS has made radical changes on its website.www.rswww.comI can't find a bloody thing now. It is extremely frustrating not to be able to view thumbnails from the different categories any more unless you go inside the category. Seriously, try finding something. Searching by keywords will almost certianly not give you the full results.Why, RS why?! This is totally wrong! At least enable the 'gallery view' again on the master categories!

author: mikeselectricstuff
author_rank: Super Contributor
timestamp: July 06, 2011, 07:30:20 am
content: Quote from: Alex on July 05, 2011, 10:26:31 pmYou mean they've actually managed to make what was already the second worst search in the industry (second only to Rapid) even worse....?RS has been crap so long I can't see how they will ever fix it - I've often spent a lot of time at shows talking to RS guys about why their website is so rubbish but I don't bother any more as they clearly aren't interested - last time the guy's attitude was along the lines of 'well some of our customers like it so why should we change it?'. Muppets..

author: Unknown
author_rank: Unknown
timestamp: July 06, 2011, 08:03:30 am
content: Thats true, sadly. I would not rank them as it depends what you are looking for and how much you know about it. Rapid is more like Maplin than RS.RS had an extensive range of mechanical components and you needed the gallery view. Now it is impossible to find something by 'browsing' and I am not exagerating at all. I find I need to pull out old BOMs for the actual RS codes. The format of the categories on the left makes things even harder.I hope thay have kept backups of the previous layout and be brave enough to realise they took the wrong direction. Hopefully they wont brand a drop in sales and online chatter as a 'transition period'.