Electrical Engineering V2

[DrLuke]

[QUOTE=chipset;42587473]It's actually fine to drink, it's a lot more toxic than ethanol, but the body can metabolize it without making you blind or anything. The effects are quite similar to ethanol but from what I've read, due to the increased toxicity the line between intoxicated and dead is way smaller than in ethanol, so it's not really safe to drink for intoxication purposes. I may be wrong but some cursory googling tells me that the LD50 of isopropanol is about 300ml for a 90kg human while for ethanol it's 500ml. Or if you will, isopropanol is about twice as toxic.[/QUOTE]

Yes, but you have to keep in mind about what happens to the Propanol AFTER you have swallowed it. The end product of Propanol-metabolism is Acetone, and if you ever used Acetone before, [B]you don't want that inside your body[/B]. While Acetone directly isn't toxic, wikipedia cites an LD50 of [B]1.159 g/kg[/B], which isn't really much if you think about it.

[Sergesosio]

Out of interest. What kind of stuff are you guys making?

i'm interesting in electrical engineering, but have no idea what to make. I'd like something that is not to ambitious for a first.

[woidoi]

[QUOTE=DrDevil;42590467]Yes, but you have to keep in mind about what happens to the Propanol AFTER you have swallowed it. The end product of Propanol-metabolism is Acetone, and if you ever used Acetone before, [B]you don't want that inside your body[/B]. While Acetone directly isn't toxic, wikipedia cites an LD50 of [B]1.159 g/kg[/B], which isn't really much if you think about it.[/QUOTE]

I remember finding out that a bottle of stuff I have has a value of like 0.3 g/kg, so as you might imagine I was quite surprised :v:

[editline]21st October 2013[/editline]

oh look at that it has an LD50 of 1,173 g/kg, I guess acetone is a real bitch then. The MAC value of it is 0.01 mg/m3 though, while that of aceton is 750mg/m3

[editline]21st October 2013[/editline]

[QUOTE=Sergesosio;42593136]Out of interest. What kind of stuff are you guys making?

i'm interesting in electrical engineering, but have no idea what to make. I'd like something that is not to ambitious for a first.[/QUOTE]

I plan to add lights to some creepy mask we have hanging on a wall over here, and they'll be activated and flicker when someone gets close to them. It's a very small project, but the way I'll be doing it requires me to use an Arduino as a programmer for a PIC (ATTINY 85), and I'm busy making a shield to make it myself easier to program it (as I originally had to use a bunch of loose cables to a breadboard, and now I only have to stick the PIC into a socket and upload what I want)

[Ddrl46]

[QUOTE=scratch (nl);42593268]I remember finding out that a bottle of stuff I have has a value of like 0.3 g/kg, so as you might imagine I was quite surprised :v:

[editline]21st October 2013[/editline]

oh look at that it has an LD50 of 1,173 g/kg, I guess acetone is a real bitch then. The MAC value of it is 0.01 mg/m3 though, while that of aceton is 750mg/m3

[editline]21st October 2013[/editline]

I plan to add lights to some creepy mask we have hanging on a wall over here, and they'll be activated and flicker when someone gets close to them. It's a very small project, but the way I'll be doing it requires me to use an Arduino as a programmer for a PIC (ATTINY 85), and I'm busy making a shield to make it myself easier to program it (as I originally had to use a bunch of loose cables to a breadboard, and now I only have to stick the PIC into a socket and upload what I want)[/QUOTE]

I think you meant AVR instead of PIC unless Microchip decided to start making Atmel microcontrollers.

[Chipset]

[QUOTE=DrDevil;42590467]Yes, but you have to keep in mind about what happens to the Propanol AFTER you have swallowed it. The end product of Propanol-metabolism is Acetone, and if you ever used Acetone before, [B]you don't want that inside your body[/B]. While Acetone directly isn't toxic, wikipedia cites an LD50 of [B]1.159 g/kg[/B], which isn't really much if you think about it.[/QUOTE]

As I said it's a lot more toxic than ethanol, but it doesn't cause permanent damage like methanol does so it is theoretically safe to drink the same way as ethanol, just in smaller quantities.

[editline]21st October 2013[/editline]

[QUOTE=Sergesosio;42593136]Out of interest. What kind of stuff are you guys making?

i'm interesting in electrical engineering, but have no idea what to make. I'd like something that is not to ambitious for a first.[/QUOTE]

Some of my earliest projects were related to lighting. Just dicking around with some LEDs can teach you a lot about power consumption, current limiting, optics and some of the physics about light and how you measure it with things like lumen, candela, lux and color temperature.
Plus I eventually got around to putting up a bunch of LED strips to illuminate my workbench, which is a very practical payoff.

[Leestons]

[QUOTE=Sergesosio;42593136]Out of interest. What kind of stuff are you guys making?

i'm interesting in electrical engineering, but have no idea what to make. I'd like something that is not to ambitious for a first.[/QUOTE]

I'm making a tone generator at the moment.

[S31-Syntax]

[QUOTE=Sergesosio;42593136]Out of interest. What kind of stuff are you guys making?
i'm interesting in electrical engineering, but have no idea what to make. I'd like something that is not to ambitious for a first.[/QUOTE]
I'm making an in-dash audio media player.
Every time my current car radio fucks up I'm reminded why its getting replaced. That simple fact is why I will finish this project.

If you're not that great at soldering but you'd like to get better, go find a simple blinky-LED type kit from an electronics hobby store.

If you want something that'll be of some use other than blinking, get this thing
[URL]https://www.sparkfun.com/products/10930[/URL]

$25, includes all required components, follow the directions and solder that shit together and get a fully functioning digital clock out of it that you can say you built.
[editline]21st October 2013[/editline]
[QUOTE=ddrl46;42586315]
It'll need some cleaning and I have to replace the 2500V DC binding post at the top left but the meter itself works fine.
I will certainly not be ruining it like this person did: [URL]http://kevinrye.net/files/vintage_avo_meter_restoration.php[/URL].[/QUOTE]
Holy Jesus, my father would have fucking gutted me and used me as a ferric chloride disposal tank.

[Lily]

[QUOTE=ddrl46;42586315]It'll need some cleaning and I have to replace the 2500V DC binding post at the top left but the meter itself works fine.
I will certainly not be ruining it like this person did: [url]http://kevinrye.net/files/vintage_avo_meter_restoration.php[/url].[/QUOTE]

That entire site is a bowl of cringe

But hey it has a contact form, at least you can tell him to fuck himself with the sharpest cactus in direct vicinity

[Zero-Point]

[QUOTE=pentium;42590106]Oh god....

Stop. Put down your Arduino.
Go outside and run out onto the freeway. Never return to electronics you fucking hipster.

What is it with Mac people? They always INSIST that everything they own look, feel and [i]smell[/i] immaculate.

Edited: Fuck this. I'm sending him an email to mock him.[/QUOTE]

"I'm a total geek when it comes to anything electronics"
1) In this sentence it should be "electronic" you fucking waste of sperm.
2) "Tinkering", "building", and/or "modifying" electronic devices means actually doing shit that WORKS, not gutting vintage gadgets in an attempt to further shove your hipster glasses so far up the bridge of your nose as to give yourself a well-deserved lobotomy.

[Lily]

Also oh god, the "3D Art" section of his site
What the fuck

He even collects "vintage" apple computers

[S31-Syntax]

Fucking hell that guys "mini digital clock"

Funny it looks damn near identical to the clock kit I posted above me, while also having less functionality and only being marginally smaller.

[Leestons]

Trying to get my arduino to play "music". It's just unrecognisable beeps right now. I think I need to adjust my delay or something.

[Metallics]

[QUOTE=Sergesosio;42593136]Out of interest. What kind of stuff are you guys making?

i'm interesting in electrical engineering, but have no idea what to make. I'd like something that is not to ambitious for a first.[/QUOTE]

If you fancy something a bit more electromechanical/electrical machines you could get some small cheap 5v motors and make something of them, you can learn a lot about power and power conditioning through driving motors.

[Tamschi]

[QUOTE=Tobba;42595078]That entire site is a bowl of cringe

But hey it has a contact form, at least you can tell him to fuck himself with the sharpest cactus in direct vicinity[/QUOTE]

He's hotlinking scripts from [URL="http://alexgorbatchev.com/"]http://alexgorbatchev.com/[/URL].

[del]That alone probably makes him an idiot in more than one way.[/del]

It's a free service, so it's just a bit dumb I suppose :v:

[MIPS]

[QUOTE=Tobba;42595148]Also oh god, the "3D Art" section of his site
What the fuck

He even collects "vintage" apple computers[/QUOTE]

[img]http://kevinrye.net/collections/files/stacks_image_1233.jpg[/img]
Wow, I was spot on. He's even taken the time to reserve a whole room for macs and framed every poster he could get his hands on.

Also, jesus christ that website is absurdly slow to load. I'm going to go kick some puppies now.

[Zero-Point]

[QUOTE=MIPS;42597831][img]http://kevinrye.net/collections/files/stacks_image_1233.jpg[/img]
Wow, I was spot on. He's even taken the time to reserve a whole room for macs and framed every poster he could get his hands on.

Also, jesus christ that website is absurdly slow to load. I'm going to go kick some puppies now.[/QUOTE]

HA! He doesn't even have the Apple II double disk-drive, what a loser! I hate Apple and even I have one of those! Let us all laugh at his misfortune!

[woidoi]

I created spawn of cthulhu or something bad

[t]https://dl.dropboxusercontent.com/u/43645231/photos/electro/2013-10-21%2023.35.08.jpg[/t]

[Agent766]

[QUOTE=scratch (nl);42600042]I created spawn of cthulhu or something bad

[t]https://dl.dropboxusercontent.com/u/43645231/photos/electro/2013-10-21%2023.35.08.jpg[/t][/QUOTE]

You should've seen the breadboards in my digital logic class. I wish I had pictures of them.

[Teppik]

[QUOTE=scratch (nl);42600042]I created spawn of cthulhu or something bad

[t]https://dl.dropboxusercontent.com/u/43645231/photos/electro/2013-10-21%2023.35.08.jpg[/t][/QUOTE]
That's [URL="https://www.adafruit.com/blog/2013/03/15/nandputer-functionally-complete-and-absolutely-necessary/"]nothing[/URL].

[Samg381]

Hey everybody, I'm not quite sure is this is the place, but I'll go ahead:
[URL="http://facepunch.com/showthread.php?t=1316515"]I'm working on a replica Daft Punk helmet for halloween.[/URL] For the visor on GB's helmet, I want to make the LED display. I picked up an LED Belt Buckle, but it's way too tiny and the battery life sucks.

From [URL="http://www.youtube.com/watch?v=EE5LadAU1zA"]this video[/URL], I can see this gentleman is using an LED sheet that is custom made and programmable.

Would there be any place where I may purchase one of these? If not are there any tutorials? Electrical Engineering is familiar to me, I have made some relatively simple devices in the past, however I am not too skilled.

Thanks in advance.

[DrLuke]

I doubt you will be able to buy anything premade for a reasonable price. You should make it yourself, if can program you already are a quarter way there.

[DrLuke]

LED-lighting soon

[t]http://i.imgur.com/Z6WgvEg.jpg[/t]

[t]http://i.imgur.com/XXd2B1i.jpg[/t]

[Chryseus]

Finally had some luck with toner transfer:

[thumb]http://u.cubeupload.com/Chryseus/kudjlA.png[/thumb]
[thumb]http://u.cubeupload.com/Chryseus/CtT6x8.png[/thumb]
[thumb]http://u.cubeupload.com/Chryseus/3ajPkU.png[/thumb]
Traces are 1.5mm.

Really going to need a drill stand though or switch fully to smd, drilling those holes by hand was a real pain.

[S31-Syntax]

So I was taking a closer look at my non-functional VFD after finally concluding it was not software side... and I found 2 sets of 3 pins that are bridged, but they don't look like they should be bridged. I'm gonna contact the manufacturer and see if they can shed some light on that.

[editline]22nd October 2013[/editline]

[QUOTE=Chryseus;42607594]Finally had some luck with toner transfer:
Really going to need a drill stand though or switch fully to smd, drilling those holes by hand was a real pain.[/QUOTE]
What my father did for the toner transfer method is use cheap photo paper, not the expensive stuff, and then run it through a laminator. He tried baking it in an electric toaster oven but it burst into flames.

After lamination he soaks it in water until the paper can be rubbed off, leaving the covered traces. Then he etches it in ferric chloride and afterwards sands off the remaining toner. I think he accomplished .5mm traces with .2mm gaps with that.

[Chryseus]

I used a free Argos catalogue as a source of paper, works quite well although there is some minor print transfer so it might not do for very small stuff, I put some paper over the top of the transfer and gave it a good iron for about a minute then soaked it in hot water before rubbing the paper off, followed by an etch in ferric chloride.
As for cleaning I just used some cheap kitchen cream cleaner and fine grade wire wool, with a final wipe with IPA to make sure it's grease free.
I might get a laminator at some point but for now the iron is good enough.

[Angus725]

module Part3 (
input CLOCK_50,

output [3:0]LEDG,
output [17:0]LEDR
);

// pattern output
parameter pattern = 18'b001001001001001001; 	

// clock freq reducer
wire reducedClock;
clockReducer CR1(CLOCK_50, reducedClock);		

// initializer block
reg startLoad;					
reg timeToShift;
integer i;

initial
begin
startLoad <= 1'b0;
timeToShift <= 1'b0;

i = -1;
end

// debug LEDs
assign LEDG[0]=~timeToShift;
assign LEDG[1]=~reducedClock;

//glorious 18 bit shift register
ShiftLR_Register_18bit(reducedClock, pattern, startLoad, timeToShift, toLEDs);

//shift direction changer
always@(posedge reducedClock)
begin
	startLoad <= 1'b1;

	if (i==14 && timeToShift == 1) //16
		begin
		i<=0;
		timeToShift <= 1'b0;
		end
	else if (i==14 && timeToShift == 0) //16
		begin
		i<=0;
		timeToShift <= 1'b1;
		end
	else
		i<=i+1;
end

//output LEDs
wire [17:0]toLEDs;
assign LEDR=toLEDs;

endmodule

/*****************reduces input by the number K == ?********************/

module clockReducer (input old, output letItOut);
integer k;
reg new;
assign letItOut=new;

always@(posedge old)
begin
	if (k == 2000000 && new == 0)//50000000
		begin
		k<=0;
		new<=1'b1;
		end
		
	else if (k == 2000000 && new == 1)//50000000
		begin
		k<=0;
		new<=1'b0;
		end
	
	else
		begin
		k<=k+1;
		end
end

endmodule

/*************18 bit shift register**************************/
module ShiftLR_Register_18bit (
input clock,
input [17:0]patterninput,
input loadSignal,
input shiftDirection,

output [17:0]registerValue);

wire RotateLeft, ParallelLoadn;
wire [17:0]D;
wire ticktock;

assign RotateLeft = shiftDirection;
assign parallelLoadn = loadSignal;
assign D[17:0] = patterninput[17:0];
assign ticktock = clock;

wire [17:0]FlipToFlop;

//em flip flops
DFFPack DFFP0 (D[0],  parallelLoadn, RotateLeft, FlipToFlop[17],	FlipToFlop[1], 	ticktock, FlipToFlop[0]);
DFFPack DFFP1 (D[1],  parallelLoadn, RotateLeft, FlipToFlop[0], 	FlipToFlop[2], 	ticktock, FlipToFlop[1]);
DFFPack DFFP2 (D[2],  parallelLoadn, RotateLeft, FlipToFlop[1], 	FlipToFlop[3], 	ticktock, FlipToFlop[2]);
DFFPack DFFP3 (D[3],  parallelLoadn, RotateLeft, FlipToFlop[2], 	FlipToFlop[4], 	ticktock, FlipToFlop[3]);

DFFPack DFFP4 (D[4],  parallelLoadn, RotateLeft, FlipToFlop[3], 	FlipToFlop[5], 	ticktock, FlipToFlop[4]);
DFFPack DFFP5 (D[5],  parallelLoadn, RotateLeft, FlipToFlop[4], 	FlipToFlop[6], 	ticktock, FlipToFlop[5]);
DFFPack DFFP6 (D[6],  parallelLoadn, RotateLeft, FlipToFlop[5], 	FlipToFlop[7], 	ticktock, FlipToFlop[6]);
DFFPack DFFP7 (D[7],  parallelLoadn, RotateLeft, FlipToFlop[6], 	FlipToFlop[8], 	ticktock, FlipToFlop[7]);

DFFPack DFFP8 (D[8],  parallelLoadn, RotateLeft, FlipToFlop[7], 	FlipToFlop[9], 	ticktock, FlipToFlop[8]);
DFFPack DFFP9 (D[9],  parallelLoadn, RotateLeft, FlipToFlop[8], 	FlipToFlop[10], 	ticktock, FlipToFlop[9]);
DFFPack DFFP10(D[10], parallelLoadn, RotateLeft, FlipToFlop[9], 	FlipToFlop[11], 	ticktock, FlipToFlop[10]);
DFFPack DFFP11(D[11], parallelLoadn, RotateLeft, FlipToFlop[10], 	FlipToFlop[12], 	ticktock, FlipToFlop[11]);

DFFPack DFFP12(D[12], parallelLoadn, RotateLeft, FlipToFlop[11], 	FlipToFlop[13], 	ticktock, FlipToFlop[12]);
DFFPack DFFP13(D[13], parallelLoadn, RotateLeft, FlipToFlop[12], 	FlipToFlop[14], 	ticktock, FlipToFlop[13]);
DFFPack DFFP14(D[14], parallelLoadn, RotateLeft, FlipToFlop[13], 	FlipToFlop[15], 	ticktock, FlipToFlop[14]);
DFFPack DFFP15(D[15], parallelLoadn, RotateLeft, FlipToFlop[14], 	FlipToFlop[16], 	ticktock, FlipToFlop[15]);

DFFPack DFFP16(D[16], parallelLoadn, RotateLeft, FlipToFlop[15], 	FlipToFlop[17], 	ticktock, FlipToFlop[16]);
DFFPack DFFP17(D[17], parallelLoadn, RotateLeft, FlipToFlop[16], 	FlipToFlop[0], 	ticktock, FlipToFlop[17]);


assign registerValue[17:0] = FlipToFlop[17:0];

endmodule


module DFFPack (input D, loadn, loadleft, L, R, CLK, output Q); //DFF packed with 2 multiplexers

wire betweenMux, MuxToDFF;
mux_1bit_2to1 M1 (D, betweenMux, loadn, MuxToDFF);
mux_1bit_2to1 M2 (L, R, loadleft, betweenMux);
DFlipFlop DFF1(MuxToDFF, CLK, Q);

endmodule


module DFlipFlop (input D, clk, output Q); // D flip flop
	reg R;
	always@ (posedge clk)
		R<=D;
	assign Q=R;
endmodule

module mux_1bit_2to1(X,Y,s,M); //3-bit wide 2-to-1 MUX
   input 	X,Y; 
   input 	s;
   output	M; 

   assign M = ({~s} & X) | ({s} & Y);

endmodule

Results:

[video=youtube;[url]http://www.youtube.com/watch?v=J7svVeVEuxM]http://www.youtube.com/watch?v=J7svVeVEuxM[/url][/video]

[Mr. Epicness]

[QUOTE=scratch (nl);42600042]I created spawn of cthulhu or something bad

[t]https://dl.dropboxusercontent.com/u/43645231/photos/electro/2013-10-21%2023.35.08.jpg[/t][/QUOTE]
I've done worse when I used a veroboard for the first time.

[No_Excuses]

So I installed an amp in my car because the stock system was garbage and 2 out of 4 speakers were dead. The magnet was busted off of one and the other was just shorted so I decided to replace the whole system.

I soon came to the conclusion that aftermarket head units look like ass and would look even worse in my car in particular (05 Dodge Magnum) so I wanted to use the stock head unit as it has an auxiliary in and that's really all I want.

After taking it apart, I found out that the stock head unit uses this quad channel IC amplifier package which I was able to find the datasheet for. Using the datasheet I found the PCB traces for each of the line level inputs that I'd be able to run to the amplifier I installed.

Because the head unit uses a a single rail supply, aka the car's battery, all the line-level signals have a DC offset on them of about 1.6V. That, and the peak output of the audio signal itself was about 300mV. I decided I needed a buffer between the stock head unit and my amp, so I built this little buffer. It has a gain of 2.5 and runs off the head unit's filtered supply.

Simulated:
[thumb]http://i.imgur.com/CYs3kAQ.jpg[/thumb]

Built:
[thumb]http://i.imgur.com/p58uGx4.png[/thumb]
[thumb]http://i.imgur.com/v9aS98R.png[/thumb]

Testing:
[thumb]http://i.imgur.com/FIqEiF4.jpg[/thumb]

About to be installed: (You can see my beautifully hacked-in RCA jacks I installed...)
[thumb]http://i.imgur.com/N6r1SfS.jpg?1[/thumb]

And embarrassingly this was like my 3rd board...having a single ended supply on an op-amp threw me for a loop with unexpected real-world results. Buut I learned a lot doing it.

[Agent766]

Would anyone happen to know about 3DSs? It'd be really cool to figure out how to make my own capture card rather than spending tons of money on one.

[Angus725]

[QUOTE=No_Excuses;42624129]
Simulated:
[thumb]http://i.imgur.com/CYs3kAQ.jpg[/thumb]

[/QUOTE]

First thing that came to mind...

Damn your simulations, I have to do that all by hand right now...All of it.

2nd thing:

you can have a AC input into an OP-AMP?