Electrical Engineering V2 - Developers

[QUOTE=Leestons;44178208]9v batteries have center terminals?[/QUOTE] look at the schematic.... wire connected to 'ground' Also, i derped making a gear: [img]http://i.imgur.com/Bp7sUNu.png[/img]

[QUOTE=nuttyboffin;44178495]look at the schematic.... wire connected to 'ground' Also, i derped making a gear: [img]http://i.imgur.com/Bp7sUNu.png[/img][/QUOTE] Have you used solidworks before?

[QUOTE=nuttyboffin;44178495]look at the schematic.... wire connected to 'ground' Also, i derped making a gear: [img]http://i.imgur.com/Bp7sUNu.png[/img][/QUOTE] looks like an abstract strategy game

[QUOTE=Angus725;44180592]Have you used solidworks before?[/QUOTE] I used it for over a week at work experiance and according to the guy who taught me at work experiance (design engineer) im rather good too. That just happened because i messed up using the pattern tool. I have managed to fix it now however. Annoyingly the Engineering reference tool is blocked on educational version, making it hard to get gears and such.

[QUOTE=nuttyboffin;44181393]I used it for over a week at work experiance and according to the guy who taught me at work experiance (design engineer) im rather good too. That just happened because i messed up using the pattern tool. I have managed to fix it now however. Annoyingly the Engineering reference tool is blocked on educational version, making it hard to get gears and such.[/QUOTE] You should try CADing Bevel gears, as a Comp. Eng. with little knowledge of gears, it was quite the pain.

[QUOTE=Angus725;44198211]You should try CADing Bevel gears, as a Comp. Eng. with little knowledge of gears, it was quite the pain.[/QUOTE] Indeed, i could imagine, well honestly the only real trouble i have is the size of the tooth, the rest like making the correct number is easy enough.

Oh boy, the RF plugin for that HP signal generator I posted on the last page is beautiful. [url=http://i.imgur.com/Ffba7aI.jpg][img]http://i.imgur.com/Ffba7aIl.jpg[/img][/url] [url=http://i.imgur.com/AghZDLX.jpg][img]http://i.imgur.com/AghZDLXl.jpg[/img][/url] [url=http://i.imgur.com/zjNbvTM.jpg][img]http://i.imgur.com/zjNbvTMl.jpg[/img][/url] [url=http://i.imgur.com/HZNQ9qn.jpg][img]http://i.imgur.com/HZNQ9qnl.jpg[/img][/url] [url=http://i.imgur.com/F9Id2UI.jpg][img]http://i.imgur.com/F9Id2UIl.jpg[/img][/url] [url=http://i.imgur.com/5DxOaBK.jpg][img]http://i.imgur.com/5DxOaBKl.jpg[/img][/url] Too bad I actually have to do some repairs to it, looks like the RF power amp (the rather dirty looking plate on the top side) isn't doing what it's supposed to. Need to get some SMB cables to continue.

That's NASA level cleanliness/compactness in design.

[QUOTE=LoneWolf_Recon;44201575]That's NASA level cleanliness/compactness in design.[/QUOTE] Well, it's HP.

My dick is hard.

What a fucking beauty.

[QUOTE=nutcake;44205138]What a fucking beauty.[/QUOTE] The dick or the HP?

I don't know what I did... [IMG]http://i11.photobucket.com/albums/a166/ballsandy/IMG_5368.jpg[/IMG] ...but it let me connect a coaxial antenna line to the single wire FM antenna on the radio.

[QUOTE=Angus725;44198211]You should try CADing Bevel gears, as a Comp. Eng. with little knowledge of gears, it was quite the pain.[/QUOTE] I've used Inventor in the past. Don't most CAD programs just have fancy tools to generate gears and everything?

[QUOTE=pentium;44206612]I don't know what I did... [IMG]http://i11.photobucket.com/albums/a166/ballsandy/IMG_5368.jpg[/IMG] ...but it let me connect a coaxial antenna line to the single wire FM antenna on the radio.[/QUOTE] You've created a balun of sorts. [editline]12th March 2014[/editline] Wait a second, what the fuck?

[QUOTE=pentium;44206612]I don't know what I did... [IMG]http://i11.photobucket.com/albums/a166/ballsandy/IMG_5368.jpg[/IMG] ...but it let me connect a coaxial antenna line to the single wire FM antenna on the radio.[/QUOTE] Idgi. Wouldn't this normally give close to 0 energy transfer due to the magnetic fields running parallel to and the electric ones being vertical on the opposite wires? My (really uneducated) guess is that there's coupling on the parallel portions of the thing and the radio is just a lot more sensitive than what you'd need for a plain cable connection.

It didn't like me just connecting the coax directly to the antenna. It had to be wrapped around the coax before there was any noticeable improvement in the signal. RF engineering is a region of electronics that is a complete mystery to me.

Is the coax shield connected to ground?

Are there any IC's that would change I2C addresses? Say I need 5 of these chips on a single bus: [url]http://www.farnell.com/datasheets/1789323.pdf[/url] These chips can only be assigned to 4 different addresses, so i would like a chip that would change its address before the capsense chip. Here's an image to explain: [thumb]http://i.imgur.com/wC0v1Lj.png[/thumb]

[QUOTE=alexaz;44216156]Are there any IC's that would change I2C addresses? Say I need 5 of these chips on a single bus: [url]http://www.farnell.com/datasheets/1789323.pdf[/url] These chips can only be assigned to 4 different addresses, so i would like a chip that would change its address before the capsense chip. Here's an image to explain: [thumb]http://i.imgur.com/wC0v1Lj.png[/thumb][/QUOTE] Could probibly do it with a small microcontroller i would have thought. [editline]12th March 2014[/editline] Could this help? [url]http://forum.arduino.cc/index.php/topic,110115.0.html[/url]

Sooo anyone know where a person could get one-off PCB's fabricated? Or just a few of them. Or is it just better to just etch them yourself?

[QUOTE=No_Excuses;44218668]Sooo anyone know where a person could get one-off PCB's fabricated? Or just a few of them. Or is it just better to just etch them yourself?[/QUOTE] hackvana.com 30$ for 10pcs of 5cmx5cm including shipping.

[QUOTE=DrDevil;44218691]hackvana.com 30$ for 10pcs of 5cmx5cm including shipping.[/QUOTE] That's exactly what I'm looking for, thanks.

[QUOTE=No_Excuses;44218804]That's exactly what I'm looking for, thanks.[/QUOTE] ITEAD 5x5cm 10pcs for $9.90 [url]http://imall.iteadstudio.com/open-pcb/pcb-prototyping/im120418001.html[/url]

[QUOTE=alexaz;43424112]There are the WS2812 strips, take 5V, but are abit more expensive as they have the chip die inside the LED itself and are addressable ( you can control the color of each one with 1 wire ).[/QUOTE] I search the webs, and found there is another similar type of this strip called WS2812B, like [URL="http://www.ledlightinghut.com/144-led-m-ws2812-digital-intelligent-rgb-led-strip-light.html"]this one[/URL], do you know the difference between them?

Right, so after almost a year of work my paper tape reader ends in a complete fucking disaster. This morning I added a bunch of resistors and rigged it up to the logic analyzer. Fed it 5V and pulled a tape through. [IMG]http://i11.photobucket.com/albums/a166/ballsandy/Computer%20related/IMG_5420.jpg[/IMG] [IMG]http://i11.photobucket.com/albums/a166/ballsandy/Computer%20related/IMG_5422.jpg[/IMG] It worked, mind you it was occasionally dropping bits because I was feeding the logic analyzer an unclean clock signal but I went ahead and added the two CD4093's that would clean the signals up into proper TTL signalling. And then everything broke. Curiously I noticed that my LOW logic state was not cirrect and there was .1v sneaking in somewhere and causing the logic to remain FALSE because only one input was 0v. I reattached the logic analyzer and all hell had broken loose. Half of my phototransistors were not giving improper readings. The others were still working but eventually and with no changes to the wiring they all became unreliable where you get a nice 5V high which the logic analyzer pulls down to about 2 or so volts and fluxuates to the point bits are lost. [IMG]http://i11.photobucket.com/albums/a166/ballsandy/Computer%20related/IMG_5450.jpg[/IMG] Really fucking pissed off now. I can't afford to rebuild the optic block but either something with the circuit went funny or the damn 4093's blew up my phototransistors. There's no really fun way to reliably salvage this unless you could somehow find a way to define a LOW state as 1v or less and a HIGH state as 1.5v or more.

[QUOTE=Chryseus;44219147]ITEAD 5x5cm 10pcs for $9.90 [url]http://imall.iteadstudio.com/open-pcb/pcb-prototyping/im120418001.html[/url][/QUOTE] I'm curious as to what software you personally use to design PCBs

[QUOTE=No_Excuses;44221033]I'm curious as to what software you personally use to design PCBs[/QUOTE] Eagle is one of the best free packages you can get. If you want to dosh out money, there are many better packages.

I've heard good things about diptrace

[QUOTE=Leestons;44222137]I've heard good things about diptrace[/QUOTE] I don't care how good diptrace is, but they limit you by the pincount. Unless you pay the full 800 dollars you have a ridiculously low limit that will be reached easily with 2-3 tqfps and some passives.