Electrical Engineering V2 - Developers

Done some breadboarding and I'm satisfied enough with my circuitry that I've sent my gerbers to iTead and my parts order to CPC. Eeep :v: Going to try and do as much programming as I can on a 328 before it arrives, so that I can get things rolling faster once the board and parts arrive! Can't do that just at the mmoment though, I'm on my break at my job at the chicken factory...

Filter design is complete. [t]http://i.cubeupload.com/7kdDw5.png[/t] [t]http://i.cubeupload.com/it5I7i.png[/t] May not need the active notch filter but I'll leave it for now, gotta get some parts for testing. I've also decided against the 3V coin cell since it greatly complicates op-amp selection, most of the low power ones are also rather shit, two 3V lithium batteries such as 18650's would be the best choice at the moment. Not sure I should even add a DC connector since some idiot will probably hook it up to a shitty Chinese supply and kill themselves if I was to sell it, that also means no power from USB.

There. We have amps. [media]http://www.youtube.com/watch?v=ECVbmC3iTdA[/media]

New stuff..... £300 each new... 300v to 15V @ 500W DC-DC Converters, each PCB has 2 or 3 for a total of 60 odd of them [img]http://i.imgur.com/BNUMEGR.jpg[/img] Loads of Current transformers :) [img]http://i.imgur.com/ZaH2yan.png[/img] 600V 400A IGBTs, 2 to a module, 2 mod [img]http://i.imgur.com/11EaLms.png[/img] 600V 600A IGBT half bridges. (one is missing, on my desk) [img]http://i.imgur.com/L0o063Z.jpg[/img] Close up of 600V 600A IGBTs (Half-Bridge) [img]http://i.imgur.com/UDqtMc9.png[/img] 10kV Potential Transformer, have had 20kV out of it, with HV wire there too, good for 150kV i do believe. [img]http://i.imgur.com/LRwgvcZ.png[/img] I got all this visiting a friend down in Derby, we went to the scrap yard and i spotted this, he has a load as well as me but i brought most of it having more money on hand at the time. He also gave / traded the potential transformer and cable. Really awesome guy! had great fun down there and did 2 videos with him, gonna post them up here soon :) [editline]31st July 2014[/editline] Here is the datasheet for the 600V 600A IGBT module: [url]www.americas.fujielectric.com/sites/default/files/2MBI600U2E-060.pdf[/url] rather high speed and a low gate capacitance... awesome. [editline]31st July 2014[/editline] Got each PCB for 50p each..... Not bad! :)

[QUOTE=nuttyboffin;45554218]New stuff..... £300 each new... 300v to 15V @ 500W DC-DC Converters, each PCB has 2 or 3 for a total of 60 odd of them [img]http://i.imgur.com/BNUMEGR.jpg[/img] Loads of Current transformers :) [img]http://i.imgur.com/ZaH2yan.png[/img] 600V 400A IGBTs, 2 to a module, 2 mod [img]http://i.imgur.com/11EaLms.png[/img] 600V 600A IGBT half bridges. (one is missing, on my desk) [img]http://i.imgur.com/L0o063Z.jpg[/img] Close up of 600V 600A IGBTs (Half-Bridge) [img]http://i.imgur.com/UDqtMc9.png[/img] 10kV Potential Transformer, have had 20kV out of it, with HV wire there too, good for 150kV i do believe. [img]http://i.imgur.com/LRwgvcZ.png[/img] I got all this visiting a friend down in Derby, we went to the scrap yard and i spotted this, he has a load as well as me but i brought most of it having more money on hand at the time. He also gave / traded the potential transformer and cable. Really awesome guy! had great fun down there and did 2 videos with him, gonna post them up here soon :) [editline]31st July 2014[/editline] Here is the datasheet for the 600V 600A IGBT module: [url]www.americas.fujielectric.com/sites/default/files/2MBI600U2E-060.pdf[/url] rather high speed and a low gate capacitance... awesome. [editline]31st July 2014[/editline] Got each PCB for 50p each..... Not bad! :)[/QUOTE] good old Derbados

[QUOTE=metallics;45554715]good old Derbados[/QUOTE] Derbados?

You guys are near Derby? Wow, small world..

[QUOTE=Falcqn;45558463]You guys are near Derby? Wow, small world..[/QUOTE] You live in Derby?!

91 miles from Derby, kinda close I guess.

[QUOTE=r0b0tsquid;45558910]You live in Derby?![/QUOTE] Belper, actually. You're also from the 'shire?

I'm from the 'shire up north of yours (Lincolnshire), loads of Facepunch programmers seem to be from around the East Midlands, it's strange :v: [editline]blah[/editline] Whoah. You're just the opposite side of Nottingham.

Im actually in Dorset i just took the coach up and hitched a ride with my boss the way back, as he has contracts up there he has to visit (automation stuff)

I live in Alveston, work for rr and yeah derbados it's what all the cool kids call it. On a more on topic note I am trying to wrap my head around some engine control logic someone wrote a very long time ago and getting good nowhere.

Anyone interested in buying some of the IGBTs or DC-DC modules....? £25 per IGBT and £40 per DC-DC module, remember, each DC module is pretty much an entire PSU in a tiny case all you need to add is a rectifier to the input. they are £300 each new... not bad deal i think im selling them at.

[QUOTE=nuttyboffin;45561305]Im actually in Dorset i just took the coach up and hitched a ride with my boss the way back, as he has contracts up there he has to visit (automation stuff)[/QUOTE] leicester/now nottingham representing

Not quite Hull but uncomfortably close representing. On topic -Why are 555 timers so much fun.

It's that time of the year again, another workbench has been added! [url=http://i.imgur.com/nWzYoaF.jpg][img]http://i.imgur.com/nWzYoaFl.jpg[/img][/url] Let's get some more posting going, post your workbench!

I'm swimming in a sea of Fluke/HP equipment at the moment. Too tired to post. I'll try and get a pic up later.

[QUOTE=Leestons;45565222]Not quite Hull but uncomfortably close representing. On topic -Why are 555 timers so much fun.[/QUOTE] Because durability and flexibility. On that topic...I've found some 'rad-hard' [URL="http://www.x-relsemi.com/EN/Documentation/Datasheet/DS-00100-11-XTR650-HIGH-TEMPERATURE%20VERSATILE%20TIMER.pdf"]555s[/URL] which give me the idea for a LEO amsat. Anyone familiar with AmSats/Cubesats?

CPC parts order has arrived! YAY So it turns out: TQFP44 is much wider pitch than I expected! (good) 0603 capacitors are really really small (good thing I didn't go 0402, thanks for the advice Mr Jones). [editline]2nd August 2014[/editline] It actually arrived yesterday (? days are difficult right now) but I saw the package as I left for work and couldn't touch it. The factory is making me take a day off because I've apparently worked an illegal number of hours :v: so I will do a bit of fiddling tomorrow!

[img]https://pbs.twimg.com/media/Bt5NB0oCUAAeBw2.png:large[/img] Finished my first ever PCB layout. I don't think this is bad for a first attempt! Sent to manufacture with OSHPark.

Don't use right angles, it makes the electrons fall off at the corners!

[QUOTE=r0b0tsquid;45570204]Don't use right angles, it makes the electrons fall off at the corners![/QUOTE] what the fuck, are you actually serious I googled it, and it is actually true what the fuck 2x good to know

Isn't it better to have as much copper as possible too? so that you in essence trace with the gaps, as opposed to drawing the traces?

[QUOTE=Gulen;45571583]Isn't it better to have as much copper as possible too? so that you in essence trace with the gaps, as opposed to drawing the traces?[/QUOTE] Yes it is usually a good idea to fill empty spaces with a copper ground plane, this helps reduce noise, coupling between signals, reduce power supply noise, reduce the impact and emission of EMI / RFI and provide a lower impedance ground.

[QUOTE=Chryseus;45572246]Yes it is usually a good idea to fill empty spaces with a copper ground plane, this helps reduce noise, coupling between signals, reduce power supply noise, reduce the impact and emission of EMI / RFI and provide a lower impedance ground.[/QUOTE] It also can make your PCB cheaper with some manufacturers as they use less chemicals, it also saves the environment, plus it looks better :)

[QUOTE=Gulen;45571583]Isn't it better to have as much copper as possible too? so that you in essence trace with the gaps, as opposed to drawing the traces?[/QUOTE] Well yeah... you are paying to get the copper removed, not put on.

[QUOTE=Fourier;45571467]what the fuck, are you actually serious I googled it, and it is actually true what the fuck 2x good to know[/QUOTE] [url]http://www.bigcarrotdigital.com/corners-USA.pdf[/url] and [url]http://www.ultracad.com/articles/90deg.pdf[/url] are saying that it's not true.

[QUOTE=Asgard;45574636][url]http://www.bigcarrotdigital.com/corners-USA.pdf[/url] and [url]http://www.ultracad.com/articles/90deg.pdf[/url] are saying that it's not true.[/QUOTE] Your sources seem to suggest they are roughly the same in emc terms, great, assuming that is true, but 90 degree corners are still more likely to lift, use 45 degrees.

[QUOTE=Asgard;45574636][url]http://www.bigcarrotdigital.com/corners-USA.pdf[/url] and [url]http://www.ultracad.com/articles/90deg.pdf[/url] are saying that it's not true.[/QUOTE] Apparently it is relevant only in very high Ghz circuits with antenas.. damn, why didn't I pasted URL before I had it, too lazy to look it up.