Electrical Engineering V2 - Developers

I live in Denmark, Ebay isn't really a thing here, and just about anything I import, I'm obligated to pay the danish VAT(25%) on, so it's unlikely to be cheaper. Besides, I'd rather not spend more time than necessary on my current 1280x1024 display :v:

[QUOTE=Dr Magnusson;41125109]We don't have Ebay here, or at least it's not very big, and Farnell only ships to companies who can provide a Central Company Register-ID. It's a tax thing.[/QUOTE] [url]http://www.ebay.co.uk/[/url] After you've entered your search terms and pressed enter (or search) go to the left bar and change [B]Item location[/B] from [I]"on Ebay UK"[/I] [B]to[/B] [I]"European Union"[/I]. And then on the top, click the drop-down window labeled [B]sort[/B] and set it from [I]"Best match"[/I] to [I]"Price + P&P: lowest first"[/I] This will sort the products by their own price, and the postage charges to your country. Additionally, if you don't want any auctions, and just wanna view [I]"Buy it now"[/I] deals, click the [I]"Buy it now"[/I] button that's close to the [I]"All listings button"[/I] [editline]21st June 2013[/editline] [QUOTE=Dr Magnusson;41125191]I live in Denmark, Ebay isn't really a thing here, and just about anything I import, I'm obligated to pay the danish VAT(25%) on, so it's unlikely to be cheaper. Besides, I'd rather not spend more time than necessary on my current 1280x1024 display :v:[/QUOTE] Also you don't have to pay the 25% tax when you order from another EU country, or if your order is under 80 DKK total.

Oh wow, I never knew that. I just hadn't ever heard of anyone using Ebay here, nobody I know has ever bought or sold anything on there. Thanks for taking the time to inform me :)

[url]https://www.skat.dk/SKAT.aspx?oId=1615423[/url] Basically what you need to know.

[QUOTE=Chryseus;41124997]Same here I don't really have enough to take EE, also I can't imagine sitting through 2 years of stuff I already mostly know.[/QUOTE] It's worth it for the bits you don't know and access to equipment like clean rooms and the chance to do things like semiconductor fabrication that I wouldn't want to do for a job, but still find interesting. But obviously it's not all about degrees, this is just the path I picked and I'm glad I have something to show at the end of it.

[QUOTE=metallics;41124705]Not terribly thread related, but I just finished my Electronic Engineering masters degree with a 2.1 I feel like a proper engineer now.[/QUOTE] Congratulations! I'd love to go do an engineering undergrad degree, just got a BSc to my name. Going postgraduate?

[QUOTE=Fuxed;41125871]Congratulations! I'd love to go do an engineering undergrad degree, just got a BSc to my name. Going postgraduate?[/QUOTE] Thank you! I considered a phd as several were being offered in interesting areas by my department but Rolls-Royce (engines, not cars) offered me a rather nice graduate engineering job which was generally a better deal so I'm starting with them in September. Exciting times.

[QUOTE=metallics;41126232]Thank you! I considered a phd as several were being offered in interesting areas by my department but Rolls-Royce (engines, not cars) offered me a rather nice graduate engineering job which was generally a better deal so I'm starting with them in September. Exciting times.[/QUOTE] Very nice, Rolls are a good company, they take good care of their people; congratulations again! Perhaps we'll encounter each other via KTP!

[t]http://u.cubeupload.com/Chryseus/mZCcjq.jpg[/t] [t]http://u.cubeupload.com/Chryseus/74PBx3.jpg[/t] Dat porn :dance:

[QUOTE=Chryseus;41126773][t]http://u.cubeupload.com/Chryseus/74PBx3.jpg[/t][/QUOTE] We had the resistor part in physics last week, but what is that spiral thing for?

[QUOTE=Tamschi;41130389]We had the resistor part in physics last week, but what is that spiral thing for?[/QUOTE] That's a current shunt resistor, very low resistance and very precise value, although interesting enough this meter does not use it for the AC current, instead it goes through an auto-transformer which steps the voltage up allowing the use of smaller resistors in the shunt network, basically a poor mans amplifier (this is 100% passive aside from 6 diodes).

FFS, Having a hard time finding complimentary N and P channels mosfets than can carry a fuckload of current. I'll probably have to venture into "putting mosfets in parallel" territory.

Could you use a solid state relay instead?

[QUOTE=Van-man;41138791]FFS, Having a hard time finding complimentary N and P channels mosfets than can carry a fuckload of current. I'll probably have to venture into "putting mosfets in parallel" territory.[/QUOTE] Ew. Do you have to use MOSFETs?

[QUOTE=Van-man;41138791]FFS, Having a hard time finding complimentary N and P channels mosfets than can carry a fuckload of current. I'll probably have to venture into "putting mosfets in parallel" territory.[/QUOTE] If you're dealing with that much current, you might want to venture into IGBT territory.

How much is a fuckload ? Also what is the maximum voltage ?

O hey I didn't know we had a thread like this. [IMG]http://img.s-c.pw/IMG_2012.jpg[/IMG] I just got a new toy yesterday, since I can't keep going to my dad's whenever I need some different voltages. I'm still pretty new to advanced electronics (obviously I have the basics from IT and I'm pretty good at soldering, but I can't wire up new things that do anything fancy without help). Luckily, my dad is an engineer so I got the best resource for knowledge and help you could imagine. Also nice to be able to get any fancy measurements most hobbyists only can dream off, because even tho my dad no longer works in EE, he always was an enthusiast as well, and owns tons of equipment.

Heh, connecting a neon between "earth" (don't actually have earth in my room, blame old house) and my radiator. [img]http://i.imgur.com/2tl5kqBl.jpg[/img] [img]http://i.imgur.com/AQjv3mk.jpg[/img]

[QUOTE=Van-man;41138791]FFS, Having a hard time finding complimentary N and P channels mosfets than can carry a fuckload of current. I'll probably have to venture into "putting mosfets in parallel" territory.[/QUOTE] IGBTs, perhaps?

Would it be possible to use the arduino as a programmer for AVR chips? And I don't mean as an ISP programmer, I am wondering if it is possible for me to put a blank Atmega328p in the slot and program it with the IDE and then unplug it from the socket and power it by itself with a battery. Also sorry if this is a common thing, I would have googled this question if I knew what the process is called. [editline]22nd June 2013[/editline] I don't know if the Atmega328p has an built-in oscillator but ignore that for now, I just want to know if this is possible.

[QUOTE=toaster_2.0;41140946]Would it be possible to use the arduino as a programmer for AVR chips? And I don't mean as an ISP programmer, I am wondering if it is possible for me to put a blank Atmega328p in the slot and program it with the IDE and then unplug it from the socket and power it by itself with a battery. Also sorry if this is a common thing, I would have googled this question if I knew what the process is called. [editline]22nd June 2013[/editline] I don't know if the Atmega328p has an inter oscillator but ignore that for now, I just want to know if this is possible.[/QUOTE] [url]http://arduino.cc/en/Tutorial/ArduinoISP[/url] USBTinyISP clones are almost free on Ebay however.

[QUOTE=toaster_2.0;41140946]Would it be possible to use the arduino as a programmer for AVR chips? [B]And I don't mean as an ISP programmer[/B], I am wondering if it is possible for me to put a blank Atmega328p in the slot and program it with the IDE and then unplug it from the socket and power it by itself with a battery. Also sorry if this is a common thing, I would have googled this question if I knew what the process is called. [editline]22nd June 2013[/editline] I don't know if the Atmega328p has an inter oscillator but ignore that for now, I just want to know if this is possible.[/QUOTE] He said not as an ISP programmer.

Tip: Always check the beta of your bipolar transistors, mine appeared to be working just fine until I noticed is was giving a beta of 8 when it should have been closer to 150. :eng101: Excuse me while I go burn it!

[QUOTE=Chryseus;41143068]Tip: Always check the beta of your bipolar transistors, mine appeared to be working just fine until I noticed is was giving a beta of 8 when it should have been closer to 150. :eng101: Excuse me while I go burn it![/QUOTE] Turn it into a FET, a Fire Emitting Transistor

[QUOTE=Leestons;41142732]He said not as an ISP programmer.[/QUOTE] Do you mean "high voltage" programming (HVP) aka parallel programming then?

[QUOTE=ddrl46;41139930]Heh, connecting a neon between "earth" (don't actually have earth in my room, blame old house) and my radiator. [img]http://i.imgur.com/2tl5kqBl.jpg[/img] [img]http://i.imgur.com/AQjv3mk.jpg[/img][/QUOTE] You should REALLY get that looked at, it is obscenely dangerous to have such a fault in the wiring of a house.

[QUOTE=ddrl46;41143557]Do you mean "high voltage" programming (HVP) aka parallel programming then?[/QUOTE] No, I just want to know if it is possible to put a blank AVR chip in the socket on an Arduino and use the board to program it instead of doing it ISP style.

[QUOTE=toaster_2.0;41144182]No, I just want to know if it is possible to put a blank AVR chip in the socket on an Arduino and use the board to program it instead of doing it ISP style.[/QUOTE] If you mean in a simple manner without a "shield", then nope. Though if you have a spare arduino laying around, you can easily fab a ISP shield to burn the bootloader, or direct burn the compiled program to the chip, sans bootloader.

Hey guys, I want to build a battery-run 12 VDC to 110 VAC inverter for about 30W of power. Can I use MOSFETS to generate the 0, +6, +12 voltages to feed into transformer, or does something like that require BJT's? Do such things usually catch on fire or kill anyone?

[QUOTE=Nikita;41150155]Hey guys, I want to build a battery-run 12 VDC to 110 VAC inverter for about 30W of power. Can I use MOSFETS to generate the 0, +6, +12 voltages to feed into transformer, or does something like that require BJT's? Do such things usually catch on fire or kill anyone?[/QUOTE] Depends how you plan on using them and how much you want to spend. You can get mosfets that will happily handle 6-8A at 200v (which would be way more than adequate for you) but they're not cheap. You could get a BJT that handles the same current/voltage for a fraction of the cost, but it really depends on your switching requirements.