Electrical Engineering V2 - Developers

Hello, one question! Is it possible to do high frequency joule thief with RF transistor? And because I am idiot when it comes to electronics (I can't really calculate shit because I don't know electronic laws), does anyone know good guide for joule thiefs?

[QUOTE=HeatPipe;44746336]Hello, one question! Is it possible to do high frequency joule thief with RF transistor? And because I am idiot when it comes to electronics (I can't really calculate shit because I don't know electronic laws), does anyone know good guide for joule thiefs?[/QUOTE] I don't see why not, but bear in mind that Joule Thief circuits have inductive kickback, so a robust bjt is required (With a Vce >= 5 x Vcc, for general rule of thumb). Also bear in mind that Joule Thief frequency effectiveness is equivalent to a PWM drive, thus keep it in the 20-100kHz frequency range. Poke around on google for [URL="http://en.wikipedia.org/wiki/Blocking_oscillator"]Blocking Oscillators[/URL] (What a Joule Thief is), but here's some good articles: [URL="http://dainaccio.wordpress.com/2012/09/25/led-boost-converter-aka-joule-thief-analysis/"]Some theory & build calculations[/URL] [URL="http://www.instructables.com/id/The-any-value-Joule-Thief-Single-AA-high-power-w/"]Instructable - More calculations & build[/URL]

Ok thanks! :D [editline]7th May 2014[/editline] Just found out that my soldering tin is eating my soldering tip... what the hell?!

Did you buy plumbers solder ? or cheap Chinese stuff.

Yeah.... What solder are you using?

Sounds like you are using acid core solder meant for plumbing.

So I made a working RPM Gauge. Yay! [url=https://dl.dropboxusercontent.com/u/30829668/Phone%20photos/VID_20140507_174108.mp4]link[/url] A note for anyone who might ever do this: X-Sim is a terrible, terrible piece of software.

That's cool, I want to do something like that now

[QUOTE=Chryseus;44747850]Did you buy plumbers solder ? or cheap Chinese stuff.[/QUOTE] Dunno, my dad gave it. Will ask him tomorrow what the heck is that stuff

[QUOTE=No_Excuses;44745071]How much current you pulling through it and what do you have for a heatsink? Any pics?[/QUOTE] I'm running 6 amps through it, and have a 40x40mm heatsink shared between the 7805 voltage reg and the IRL540N MOSFET?

[QUOTE=MatheusMCardoso;44739604]This discussion reminds me of [img]http://i.imgur.com/r7dpco5.jpg[/img] big image for shock value.[/QUOTE] Hey cool, that's mine! This thing now has a fully-fledged C-like cross compiler and an operating system that can load programs from flash. I was going to post it soon but I thought that side was more programming than EE! I've also finished my 190 page writeup and 35 page manual oh my god why was A level computing ever a good idea :v: [editline]7th May 2014[/editline] It's got another board now: [t]http://i.imgur.com/gFKEjEv.jpg[/t] Ignore the random bit of orange wire, it wasn't in use at the time, I just needed to snap a couple of photos for my writeup. [editline]7th May 2014[/editline] Also the massive long black one :v: I need to put a few jumpers into it to program the ROM, it's cool, with 8 wires for the data bus + 4 control wires I can take over the data and address buses and program the EEPROM. I can then also take over all the I/O registers and use them to reprogram the flash device, all without having to unwire anything or take the chips out, from the comfort of a serial console on my desktop!

I have some unleaded, fairly thick solder that I got at Canadian Tire that ate the shit out of my crappy Weller tips. The Multicore brand solder that bought recently is so much easier to use. Solder makes a huge difference with how well your soldering turns out, who would have thought?

[QUOTE=r0b0tsquid;44749466]Hey cool, that's mine! This thing now has a fully-fledged C-like cross compiler and an operating system that can load programs from flash. I was going to post it soon but I thought that side was more programming than EE! I've also finished my 190 page writeup and 35 page manual oh my god why was A level computing ever a good idea :v: [editline]7th May 2014[/editline] It's got another board now: [t]http://i.imgur.com/gFKEjEv.jpg[/t] Ignore the random bit of orange wire, it wasn't in use at the time, I just needed to snap a couple of photos for my writeup. [editline]7th May 2014[/editline] Also the massive long black one :v: I need to put a few jumpers into it to program the ROM, it's cool, with 8 wires for the data bus + 4 control wires I can take over the data and address buses and program the EEPROM. I can then also take over all the I/O registers and use them to reprogram the flash device, all without having to unwire anything or take the chips out, from the comfort of a serial console on my desktop![/QUOTE] You should share the writeup

[QUOTE=Map in a box;44750109]You should share the writeup[/QUOTE] It's only about the compiler really, only very little about the processor! I'm thinking I ought to wait until results day before posting it? I don't know how these things work, don't want to get done by the exam board for plagiarising my own work off of the internet :v: The processor's documented in a fair bit of detail [url=https://github.com/Wren6991/NorForkConditionally/tree/master/processor]here[/url] if you fancy a quick read in the meantime.

[QUOTE=r0b0tsquid;44750206]It's only about the compiler really, only very little about the processor! I'm thinking I ought to wait until results day before posting it? I don't know how these things work, don't want to get done by the exam board for plagiarising my own work off of the internet :v: The processor's documented in a fair bit of detail [url=https://github.com/Wren6991/NorForkConditionally/tree/master/processor]here[/url] if you fancy a quick read in the meantime.[/QUOTE] Bonus points if they notice :v: just put it on your repo [editline]7th May 2014[/editline] But nah it's fine, just update the repo after you get your results. Interesting design choices btw :v:

[QUOTE=paindoc;44749421]I'm running 6 amps through it, and have a 40x40mm heatsink shared between the 7805 voltage reg and the IRL540N MOSFET?[/QUOTE] Sounds like it's on the small size for both devices.

[QUOTE=No_Excuses;44751764]Sounds like it's on the small size for both devices.[/QUOTE] balls, we're shit out of luck and my presentation is on monday. welp

[QUOTE=paindoc;44751789]balls, we're shit out of luck and my presentation is on monday. welp[/QUOTE] Can't slap a fan on it or change it at all? What is it exactly you're making?

[QUOTE=No_Excuses;44751956]Can't slap a fan on it or change it at all? What is it exactly you're making?[/QUOTE] [t]http://i.imgur.com/eeI7pjx.png[/t] Peltier cooling system. Fan sucks in ambient air from left outputs through holes in top of enclosure into drink cabinet. Bottom fan keeps other heatsink cool so peltier can keep cooling. If I stick a mosfet on one of the heatsinks it is either unlikely to stay much cooler (hot side) or destroy our cooling (cold side) [editline]8th May 2014[/editline] HS being heatsink here, 40x40mm aluminum heatsinks

[QUOTE=sambooo;44748284]So I made a working RPM Gauge. Yay! [url=https://dl.dropboxusercontent.com/u/30829668/Phone%20photos/VID_20140507_174108.mp4]link[/url] A note for anyone who might ever do this: X-Sim is a terrible, terrible piece of software.[/QUOTE] Hey, I made one of those too. [video=youtube;OZFeq_nSK7s]http://www.youtube.com/watch?v=OZFeq_nSK7s[/video] Used a raspberry pi though, so I guess it's easier? Also jesus fuck my desk was a mess when I made that video.

[QUOTE=paindoc;44752038][t]http://i.imgur.com/eeI7pjx.png[/t] Peltier cooling system. Fan sucks in ambient air from left outputs through holes in top of enclosure into drink cabinet. Bottom fan keeps other heatsink cool so peltier can keep cooling. If I stick a mosfet on one of the heatsinks it is either unlikely to stay much cooler (hot side) or destroy our cooling (cold side) [editline]8th May 2014[/editline] HS being heatsink here, 40x40mm aluminum heatsinks[/QUOTE] So where is the fet and regulator mounted currently? I'd keep them on their own heatsink away from the peltier setup. You're right in thinking that the pelitier will either overheat them, or just cancel out the cooling effects. Also how much power is the regular dissipating?

[QUOTE=nutcake;44752723]Hey, I made one of those too. [...] Used a raspberry pi though, so I guess it's easier? Also jesus fuck my desk was a mess when I made that video.[/QUOTE] How does that interfacing work out? Third party software to send out commands? Or are you taking advantage of force feedback?

seeing how we're talking about peltiers, I got mine two days ago [t]https://dl.dropboxusercontent.com/u/43645231/photos/electro/2014-05-08 17.30.54.jpg[/t] big ass heatsink does help I assume as this thing cools like a motherfucker. I didn't do the thermal paste so well though as the outer corners aren't covered, and it's hard to get the plate off due to suction forces :v: [editline]8th May 2014[/editline] and that's on 9 V. can't wait to try it on 12

[QUOTE=r0b0tsquid;44750206]It's only about the compiler really, only very little about the processor! I'm thinking I ought to wait until results day before posting it? I don't know how these things work, don't want to get done by the exam board for plagiarising my own work off of the internet :v: The processor's documented in a fair bit of detail [url=https://github.com/Wren6991/NorForkConditionally/tree/master/processor]here[/url] if you fancy a quick read in the meantime.[/QUOTE] Never really understood the appeal of building a computer via breadboard. Wouldn't it require more time to wire the chips correctly than the working out the more intellectually challenging abstraction to a high level programming language? Background: made a RISC CPU on FPGA, generally didn't like assembly (although HDL programming was interesting).

[QUOTE=Angus725;44755190]Never really understood the appeal of building a computer via breadboard. Wouldn't it require more time to wire the chips correctly than the working out the more intellectually challenging abstraction to a high level programming language? Background: made a RISC CPU on FPGA, generally didn't like assembly (although HDL programming was interesting).[/QUOTE] Generally it would take more time in construction than in language implementation (Atleast in my limited 4-Bit experience), but IMO its more fun to interact with the individual interconnects between logic gates from a physical standpoint, although implementation on a FPGA does sound interesting.

[QUOTE=LoneWolf_Recon;44754248]How does that interfacing work out? Third party software to send out commands? Or are you taking advantage of force feedback?[/QUOTE] No, I just read the values from the game memory with C#, spam them over UDP and use Python on the Pi to catch and interpret them. It's a real dirty way to do it and I have to manually enter the new memory address of the RPM value every time I restart the game but it works and that makes me happy. :v:

[QUOTE=nutcake;44755795]No, I just read the values from the game memory with C#, spam them over UDP and use Python on the Pi to catch and interpret them. It's a real dirty way to do it and I have to manually enter the new memory address of the RPM value every time I restart the game but it works and that makes me happy. :v:[/QUOTE] And how exactly did you find that memory address? Windows Hex Viewer?

[QUOTE=LoneWolf_Recon;44755910]And how exactly did you find that memory address? Windows Hex Viewer?[/QUOTE] lots of trial and error with cheat engine.

[QUOTE=nutcake;44755952]lots of trial and error with cheat engine.[/QUOTE] You could make a tool that uses signature scanning to find the proper location. Add me on steam if interested.

After some Google digging, this might be of use (Couldn't find a Linux equivalent): [URL]http://www.ollydbg.de/[/URL] [URL="http://www.codeproject.com/Articles/670373/Csharp-Read-Write-another-Process-Memory"]C# Implementation[/URL]