Electrical Engineering V3 - Developers

[QUOTE=war_man333;49342754]Nixie tubes look soooo much better than 7-segs.[/QUOTE] So are Vacuum Fluorescent Displays, but they both are more exotic to 'drive' than LED displays.

[QUOTE=DrDevil;49333853]Well... fuck. [t]https://my.mixtape.moe/jmwypl.jpg[/t][/QUOTE] I feel your pain. [editline]18th December 2015[/editline] [QUOTE=Yahnich;49336008]tfw i accidentally mirrored my pcb with assymmetrical components[/QUOTE] I feel your pain too.

[QUOTE=Fourier;49344353]I feel your pain. [editline]18th December 2015[/editline] I feel your pain too.[/QUOTE] Didn't we have someone in here have the same thing happen with a DIP package and they just soldered jumper wires to everything to make it work?

[QUOTE=Cakebatyr;49345404]Didn't we have someone in here have the same thing happen with a DIP package and they just soldered jumper wires to everything to make it work?[/QUOTE] [img]https://pbs.twimg.com/media/CUiuXy8UcAA8I9g.jpg[/img] :suicide:

[QUOTE=ddrl46;49345497][img]https://pbs.twimg.com/media/CUiuXy8UcAA8I9g.jpg[/img] :suicide:[/QUOTE] That's dirty. And time consuming, I mean, i just imagine getting just one of the wires wrong.

Cool beans, nabbed a 220v AC to 42v DC power supply from an Epson printer :v: I was hoping for a stepper but all I got was 2 motors and a rotary encoder ring and IR thinger for it.

[QUOTE=ddrl46;49345497][img]https://pbs.twimg.com/media/CUiuXy8UcAA8I9g.jpg[/img] :suicide:[/QUOTE] I remember seeing that when I looked up "dedication" in the dictionary. Seriously holy fuck.

Honestly I don't think anything is worth that much time and effort. I mean seriously just buy a new board at that point.

So going though all the images to find this soldering nightmare I found out that the fp_images.php page [I]does indeed show every image ever posted[/I] including the now-deleted dildo spambot we had in here at one point. I didn't see what I was looking for. I'm forced to assume it was my early days of browsing this series of threads and stumbling onto [url=https://facepunch.com/showthread.php?t=1250138&p=46123102&viewfull=1#post46123102]something[/url] [url=https://facepunch.com/showthread.php?t=1250138&p=44231408&viewfull=1#post44231408]Pentium[/url] did.

[QUOTE=Cakebatyr;49348313]So going though all the images to find this soldering nightmare I found out that the fp_images.php page [I]does indeed show every image ever posted[/I] including the now-deleted dildo spambot we had in here at one point. I didn't see what I was looking for. I'm forced to assume it was my early days of browsing this series of threads and stumbling onto [url=https://facepunch.com/showthread.php?t=1250138&p=46123102&viewfull=1#post46123102]something[/url] [url=https://facepunch.com/showthread.php?t=1250138&p=44231408&viewfull=1#post44231408]Pentium[/url] did.[/QUOTE] I think you were looking for this image posted back in the OP of Electronics and Embedded Programming V3 by MIPS: [img]http://i11.photobucket.com/albums/a166/ballsandy/100_2534.jpg[/img]

Look around for the photo of the cable I attached to a PLCC socket. Nixie test gear is the shit but these days you need to give it a good calibration before you should be trusting it for real work.

Found it. [IMG]http://i11.photobucket.com/albums/a166/ballsandy/Computer%20related/CGS_0487.jpg[/IMG]

I'm going to make a 3 phase wye output inverter. Before I start, I'd like to ask for some opinions on which topology would be easier to implement. Here's a 3 "independent" phase inverter using iso transformers to create the wye output: [t]http://i.imgur.com/sXAW8u2.jpg[/t] Then the advanced 4 leg inverter: [t]http://i.imgur.com/LG1FmDm.jpg[/t] The former would have to use advanced math (space vectors, blech), which I've tried to study and it's just confusing the piss out of me. Which one would you choose and why?

[QUOTE=Sombrero;49358097]I'm going to make a 3 phase wye output inverter. Before I start, I'd like to ask for some opinions on which topology would be easier to implement. Here's a 3 "independent" phase inverter using iso transformers to create the wye output: [t]http://i.imgur.com/sXAW8u2.jpg[/t] Then the advanced 4 leg inverter: [t]http://i.imgur.com/LG1FmDm.jpg[/t] The former would have to use advanced math (space vectors, blech), which I've tried to study and it's just confusing the piss out of me. Which one would you choose and why?[/QUOTE] Neither, you should just use a standard 3 phase bridge, that 4th one has no use. could you give us some information on why you need the 4th leg. for 3 phase you should never have an unbalanced load so the N is only to deal with small parasitic currents or 'mess'.

[QUOTE=nuttyboffin;49362319]Neither, you should just use a standard 3 phase bridge, that 4th one has no use. could you give us some information on why you need the 4th leg. for 3 phase you should never have an unbalanced load so the N is only to deal with small parasitic currents or 'mess'.[/QUOTE] If he's gonna make a inverter that feeds into a 3-phase CEE socket, then he NEEDS neutral. Especially since these types of adapters are common: [t]http://s16.postimg.org/s6ob04zn9/CEE_3phase_to_3_singlephase.jpg[/t] Each of those blue single phase outlets are using their own phase + the common neutral, and those adapters are common to find on construction sites and shops.

[QUOTE=Van-man;49362564]If he's gonna make a inverter that feeds into a 3-phase CEE socket, then he NEEDS neutral. Especially since these types of adapters are common: [t]http://s16.postimg.org/s6ob04zn9/CEE_3phase_to_3_singlephase.jpg[/t] Each of those blue single phase outlets are using their own phase + the common neutral, and those adapters are common to find on construction sites and shops.[/QUOTE] Anything on this power level, especially 3 phase you should buy a professional unit. You WILL spend more time and money developing and making one that works then buying an actual unit. It is a much larger undertaking then first thought. I have a book on the design of this kind of inverters. The actual maths and design work involved is phenomenal. [url]http://www.criticalpowersupplies.co.uk/suvtp15kh4b4s?gclid=CJXw1Kbj7ckCFQTlwgodsToLhw[/url] you can always buy a second hand one. Honestly buying a generator is cheaper. If you are just making this for a bit of fun, first have a go making a BLDC driver, then move to a Brushless AC motor driver. You're going to have to deal with load balancing and a million other things.

I know RTL-SDR is inaccurate, but. [t]https://i.imgur.com/C8Frfki.png[/t] It's slightly funny how bad the 433MHz "transmitters" on eBay are. I bought some ages ago, never played around with them.

[QUOTE=nuttyboffin;49363094]Anything on this power level, especially 3 phase you should buy a professional unit. You WILL spend more time and money developing and making one that works then buying an actual unit. It is a much larger undertaking then first thought. I have a book on the design of this kind of inverters. The actual maths and design work involved is phenomenal. [url]http://www.criticalpowersupplies.co.uk/suvtp15kh4b4s?gclid=CJXw1Kbj7ckCFQTlwgodsToLhw[/url] you can always buy a second hand one. Honestly buying a generator is cheaper. If you are just making this for a bit of fun, first have a go making a BLDC driver, then move to a Brushless AC motor driver. You're going to have to deal with load balancing and a million other things.[/QUOTE] yeah i agree. why do you need to convert 3-phase AC to DC anyway? For a welder? that's the only thing i can think of needing this and even 3-phase welders have their own AC to DC converters. playing around with this energy or power level is a great way to blow incredibly expensive power panels/fuses and also get yourself killed

[QUOTE=Penguiin;49363779]yeah i agree. why do you need to convert 3-phase AC to DC anyway? For a welder? that's the only thing i can think of needing this and even 3-phase welders have their own AC to DC converters. playing around with this energy or power level is a great way to blow incredibly expensive power panels/fuses and also get yourself killed[/QUOTE] He's going the other way around, wanting to create 3 phase AC from high voltage DC

[QUOTE=Van-man;49364041]He's going the other way around, wanting to create 3 phase AC from high voltage DC[/QUOTE] ohhh ok. that seems like an even more niche usage and would prolly cost a shit load of money. even 1 phase inverters that create a pure sine wave cost an arm and a leg for even just 1000W capacity. seems like a fun project if you have lot of disposable income or someone else paying for it though

[QUOTE=Penguiin;49364117]ohhh ok. that seems like an even more niche usage and would prolly cost a shit load of money. even 1 phase inverters that create a pure sine wave cost an arm and a leg for even just 1000W capacity. seems like a fun project if you have lot of disposable income or someone else paying for it though[/QUOTE] My guess is he wants to make a inverter that's powered by a battery bank, which in turn gets charged by a array by solar panels or household off-grid windmill. He'd still need a way to regulate the input voltage for the AC inverters that way though. But yeah, pure sine-wave inverters costs a fuckload and also ain't that effective. There's a reason modified sine-wave inverters exist and that's because they're cheaper and/or more efficient, depending on how it's implemented.

[QUOTE=Van-man;49364254]My guess is he wants to make a inverter that's powered by a battery bank, which in turn gets charged by a array by solar panels or household off-grid windmill. He'd still need a way to regulate the input voltage for the AC inverters that way though. But yeah, pure sine-wave inverters costs a fuckload and also ain't that effective. There's a reason modified sine-wave inverters exist and that's because they're cheaper and/or more efficient, depending on how it's implemented.[/QUOTE] Honestly if your looking to do things for an off grid home I would personally just replace the 230VAC in your house with the HVDC and 99% of things should run still as they all use rectifiers in them these days :P As long as you are smart about it, it should be fine.

[QUOTE=nuttyboffin;49364658]Honestly if your looking to do things for an off grid home I would personally just replace the 230VAC in your house with the HVDC and 99% of things should run still as they all use rectifiers in them these days :P As long as you are smart about it, it should be fine.[/QUOTE] Some switchmode power supplies DEPENDS on the AC waveform as some sort of clockrate, which is why they won't work with shitty inverters that uses half-assed modified sine-wave or even square wave. Or they have a "dumb" transformer as first steb on their input to provide double isolation, and guess how well a transformer works with DC. Same deal with mains powertools, no sine-wave, no worky. There's a reason you should either get a GOOD inverter no matter what in those cases, because otherwise you'd end up having to modify pretty much your equipment that uses AC motors or switchmode power supplies.

[video=youtube;VCK9l9gmyDk]https://www.youtube.com/watch?v=VCK9l9gmyDk[/video] This is a new one to me

I couldn't handle it, it's like a really strange cross of Offspring and Limp Biskit. But those deadlines tho.

I need a variable voltage regulator for my LEDs. I think I need it rated for 5 to 10A, I'm not entirely sure yet. Any suggestions? I have 3 LEDs in series that have a forward current of 700mA per LED. Does that mean the current draw of each series is 2.1A? I want to redo the LED light because using resistors to drop voltage makes it hard to sleep at night with the light on. I had to use 5w resistors in 5 series of LEDs and they get incredibly hot compared to the 10w resistors in the other series.

[QUOTE=false prophet;49371796]I need a variable voltage regulator for my LEDs. I think I need it rated for 5 to 10A, I'm not entirely sure yet. Any suggestions? I have 3 LEDs in series that have a forward current of 700mA per LED. Does that mean the current draw of each series is 2.1A? I want to redo the LED light because using resistors to drop voltage makes it hard to sleep at night with the light on. I had to use 5w resistors in 5 series of LEDs and they get incredibly hot compared to the 10w resistors in the other series.[/QUOTE] Series = current stays the same Parallel = voltage stays the same Also it's best practice to current-limit LED's.

[QUOTE=Yahnich;49372035]are you sure about 700mA? most LEDs have a 40-60mA upper limit[/QUOTE] You can get high-power LED's nowadays, Cree and Philips are the forerunners, but there's semi-good Chinese generic copies that are good enough for experimenting and home hobby projects.

[QUOTE=Yahnich;49372035]are you sure about 700mA? most LEDs have a 40-60mA upper limit;LEDs[/QUOTE] Most of the LEDs used for lighting purpose are 350/700mA

Yes, they're 700mA LEDs. I took the information provided above and came up with the circuit for 5 series pulling 3.5A. So I think I will need at least 2 voltage regulators, or 10 LM317 which I don't really want do to. Can anyone suggest a voltage regulator for 2v-12v which won't blow up at 3.5A, maybe 5A? I looked at LM338K but there seems to be a big issue with them not being as advertised, usually only 1A or something.