Electrical Engineering V2 - Developers

[thumb]http://i.cubeupload.com/ygMfHX.png[/thumb] I was bored.

All this talk about xray tubes reminded me I still have that tube and transformer assembly sitting on a shelf. [IMG]http://i11.photobucket.com/albums/a166/ballsandy/P2202526.jpg[/IMG] I'm curious now because back then I didn't have a regulated 240 supply, variac and a more sensitive geiger counter. I wonder if I can get it to strike....

[QUOTE=pentium;45367987]All this talk about xray tubes reminded me I still have that tube and transformer assembly sitting on a shelf. [IMG]http://i11.photobucket.com/albums/a166/ballsandy/P2202526.jpg[/IMG] I'm curious now because back then I didn't have a regulated 240 supply, variac and a more sensitive geiger counter. I wonder if I can get it to strike....[/QUOTE] I would imagine somthing like that would need to be under oil and under a vaccum to get all those bubbles of air out of the windings. ones that small also work best at a higher frequency, say.... 20kHz

[QUOTE=nuttyboffin;45368624]I would imagine somthing like that would need to be under oil and under a vaccum to get all those bubbles of air out of the windings. ones that small also work best at a higher frequency, say.... 20kHz[/QUOTE] but wat if it iradiate metal waves it will disipate enough nergy

Are any of you using benchtop power supplies when you're experimenting?

[QUOTE=mrmr;45375087]Are any of you using benchtop power supplies when you're experimenting?[/QUOTE] sure am! :) My SMX7220, 0-70V/0-20A SMPS My two Agilent 6632B that are 0-20V/0-5A and my 'bench top' (usually on the floor) Variac for 0-260V @ 20A (can do 40A)

[QUOTE=nuttyboffin;45375111]sure am! :) My SMX7220, 0-70V/0-20A SMPS My two Agilent 6632B that are 0-20V/0-5A and my 'bench top' (usually on the floor) Variac for 0-260V @ 20A (can do 40A)[/QUOTE] That's some nice looking equipment. At the moment I just have a range of fixed voltage PSUs but I'm interested in getting something like this where I can adjust the voltage easily.

[QUOTE=mrmr;45375383]That's some nice looking equipment. At the moment I just have a range of fixed voltage PSUs but I'm interested in getting something like this where I can adjust the voltage easily.[/QUOTE] [url]http://www.conrad-electronic.co.uk/ce/en/product/513812/[/url] I highly recommend this, got two on my bench and they work great.

[QUOTE=Chryseus;45367370][thumb]http://i.cubeupload.com/ygMfHX.png[/thumb] I was bored.[/QUOTE] Spent 5 minutes trying to figure out what the voltages are on the source/drain those MOSFETS, then remembered I have to solve the BJTs first... [img]http://i.somethingawful.com/forumsystem/emoticons/emot-effort.gif[/img] Care to upload the simulation file?

[QUOTE=Angus725;45375749]Spent 5 minutes trying to figure out what the voltages are on the source/drain those MOSFETS, then remembered I have to solve the BJTs first... [img]http://i.somethingawful.com/forumsystem/emoticons/emot-effort.gif[/img] Care to upload the simulation file?[/QUOTE] Here you go. [url]https://www.dropbox.com/s/x5kilw30rvygyrb/Charger.asc[/url]

[QUOTE=Chryseus;45375700][url]http://www.conrad-electronic.co.uk/ce/en/product/513812/[/url] I highly recommend this, got two on my bench and they work great.[/QUOTE] Actually I had just found this [URL="http://www.ebay.co.uk/itm/New-HQ-Variable-Regulated-PS305D-30V-5A-DC-Lab-Power-Supply-240V-/400396805866?pt=UK_BOI_Electrical_Test_Measurement_Equipment_ET&hash=item5d398266ea"]one[/URL], which seems promising. Do you think it would be okay?

[QUOTE=mrmr;45376393]Actually I had just found this [URL="http://www.ebay.co.uk/itm/New-HQ-Variable-Regulated-PS305D-30V-5A-DC-Lab-Power-Supply-240V-/400396805866?pt=UK_BOI_Electrical_Test_Measurement_Equipment_ET&hash=item5d398266ea"]one[/URL], which seems promising. Do you think it would be okay?[/QUOTE] You're paying 20 pounds extra for buying from conrad.

You're suggesting that it'd be better to spend the extra money and buy it from Conrad?

[QUOTE=mrmr;45376393]Actually I had just found this [URL="http://www.ebay.co.uk/itm/New-HQ-Variable-Regulated-PS305D-30V-5A-DC-Lab-Power-Supply-240V-/400396805866?pt=UK_BOI_Electrical_Test_Measurement_Equipment_ET&hash=item5d398266ea"]one[/URL], which seems promising. Do you think it would be okay?[/QUOTE] Funnily enough that Basetech supply was on 10% off yesterday, I have one of those and it's very well built, doesn't give a shit if you leave it on all day at full load either. I'm not sure about that supply you linked, I think it's similair to the one DrDevil has but I'm not really a fan of that style of power supply case. The knobs on mine are all off center and pull off way too easily but I probably have a bad one knowing my luck.

I have a QJE QJ3003E, which costs ~60€ on ebay. [t]http://ecx.images-amazon.com/images/I/51L%2BsPcmIoL.jpg[/t] It certainly does the job on the lower end, although the output capacity is a little bit high in my opinion. On the other hand it has no weird glitches or voltage spikes when turning off, which the basetech supply you linked has if I remember correctly. I bought mine from a german dealer on ebay, together with a 2 year warranty. The only thing that REALLY bugs me about it, is the fact that it has no carry handle. But it should be easy enough to add your own handle.

They're all more or less the same, just differences in build quality which is why I like Basetech, big ass heatsink and no fan. It has a minor turn on spike which could be an issue with sensitive stuff, but that probably can be fixed.

[QUOTE=Chryseus;45377795]They're all more or less the same, just differences in build quality which is why I like Basetech, big ass heatsink and no fan. It has a minor turn on spike which could be an issue with sensitive stuff, but that probably can be fixed.[/QUOTE] I think it's a very bad trait though, as it can easily catch you off guard and fry your circuit. [editline]13th July 2014[/editline] On the other hand, if you work with stuff that sensitive you'd probably be doing well to spend a little more money on a PSU.

And then you waste hours on why your stuff refuses to work as everything seems to have been done correctly

Alright, neat. Thanks for your posts. I'm going to keep looking around as I gotta wait till next payday before I can buy one anyway. Will let you know what I get.

[QUOTE=Chryseus;45377795]They're all more or less the same, just differences in build quality which is why I like Basetech, big ass heatsink and no fan. It has a minor turn on spike which could be an issue with sensitive stuff, but that probably can be fixed.[/QUOTE] It spikes on turn off, not turn on. Well at least you have the option to enable / disable the output unlike that other supply. Also, it could probably be fixed since the schematics are readily available: [url]http://www.produktinfo.conrad.com/datenblaetter/500000-524999/513812-sp-01-en-BASETECH_BT_305_LABOR_NETZTEIL.pdf[/url].

Question, I am getting one of these soon : [URL]http://www.dx.com/p/mtdz007-rf-2-channel-wireless-remote-control-relay-switch-module-green-brown-black-12v-153868#.U8N6D_l_tps[/URL] I was thinking could I open up the remote and somehow drive the 2 buttons with a microcontroller ? Any idea's on that ? Edit : Changed the order to some general purpose rf kit.

[QUOTE=Chryseus;45375827]Here you go. [url]https://www.dropbox.com/s/x5kilw30rvygyrb/Charger.asc[/url][/QUOTE] Should probably have sent you this. [img]http://puu.sh/aaIt0/a65d88403f.png[/img]

[QUOTE=Angus725;45384939]Should probably have sent you this. [img]http://puu.sh/aaIt0/a65d88403f.png[/img][/QUOTE] [URL="http://www.linear.com/designtools/software/"]LTSpice[/URL] is glorious and free.

To be honest unless I'm doing something special I'd rather use LTSpice over any paid software, in my experience most of the paid stuff is bloated, slow or lacking community support, none of that can be said for LTSpice.

Had a course that had labs that required MultiSIM (and gave us a free copy of the student edition).

hmm, how would you guys feel about a steam group for (electrical) engineers? I am thinking of one not just for Facepunch alone, but to get all kinds of people which have a hobby in making their own stuff. There probably already is a group for that, but in the slight chance there isn't I could go and make one maybe.

I don't see the point in one personally.

[QUOTE=scratch (nl);45394964]hmm, how would you guys feel about a steam group for (electrical) engineers? I am thinking of one not just for Facepunch alone, but to get all kinds of people which have a hobby in making their own stuff. There probably already is a group for that, but in the slight chance there isn't I could go and make one maybe.[/QUOTE] Would be interesting to have, although not sure how active it would be.

Spent half an hour prying the digital display from my old clock. Everything went well until I ruined the LEDs by passing 3.3V into each plug without putting any resistance between the source and the pins. Or at least that's what I think went wrong, they all got procedurally darker until they stopped glowing at all. Does anyone have any experience with doing this sort of thing? Because I would really like to know what I did wrong so I don't mess up next time.

It sounds like you didn't limit the current and they went pop