Electrical Engineering V2

[Chryseus]

Was looking around for some decent passive filter design software and came across this:
[url]http://www.omicron-lab.com/quickfil.html[/url]
Only slight problem is it's designed to run in MS-DOS which means it won't work on 64 bit Windows, pretty much the best software I've found and it's free.

[DrLuke]

[QUOTE=Chryseus;44613062]Was looking around for some decent passive filter design software and came across this:
[url]http://www.omicron-lab.com/quickfil.html[/url]
Only slight problem is it's designed to run in MS-DOS which means it won't work on 64 bit Windows, pretty much the best software I've found and it's free.[/QUOTE]

Maybe you can use DOSBox to run it?

[LoneWolf_Recon]

[QUOTE=DrDevil;44613303]Maybe you can use DOSBox to run it?[/QUOTE]

Just tried it, it can't be run in DOS mode...We'll need MIPS for this one

[Fuxed]

[QUOTE=LoneWolf_Recon;44613332]Just tried it, it can't be run in DOS mode...We'll need MIPS for this one[/QUOTE]

Might be worth trying with FreeDOS, I'll give it a go tonight.

[DrLuke]

In any case a virtual machine should work.
Or if you're running linux, maybe wine can help.

[Chryseus]

It works fine on my shitty Windows XP laptop.
It looks like it was designed for early Windows version like 95 / 98

[Angus725]

[QUOTE=ArgvCompany;44596395]I want to try to build my own simplistic 8-bit CPU. I'm not too worried about the "electronic details", but rather about the sequential logic. For example, how would one decide what operations to support in the ALU? How do I generally decide my instruction set for an educational CPU? What kind of memory model can I use? I think I should use registers, but I'm not sure how they are separate from other kinds of memory per se.[/QUOTE]

One of the several pages you may find useful:
[url]http://www.eecg.toronto.edu/~moshovos/ECE243-07/l20-multicycle.html[/url]

You'll find the rest of the pages here:
[url]http://www.eecg.toronto.edu/~moshovos/ECE243-07/[/url]

What's not shown is the Finite State Machine that controls the CPU. Also note that this is a Von Neumann architecture.

(I'm taking this course right now, almost done with it, just a final exam left)

[Zero-Point]

Just finished ordering $80-90 worth of shit for this reflow oven project. (bought 4 SSRs because why the fuck not? :v:)
It's amazing how fucking cheap Arduinos can be on eBay, they had Nanos for $2-3! Would've grabbed some of them but lolChina. Not that I'm super patriotic or anything, just didn't feel like waiting 3 months for them to arrive.

[alexaz]

If someone isn't following Hackaday or hasn't seen this, you must see this. This shit is beyond cool.
[video=youtube;uL6e3co4Qqc]http://www.youtube.com/watch?v=uL6e3co4Qqc[/video]

[Fuxed]

[QUOTE=alexaz;44626391]If someone isn't following Hackaday or hasn't seen this, you must see this. This shit is beyond cool.
[video=youtube;uL6e3co4Qqc]http://www.youtube.com/watch?v=uL6e3co4Qqc[/video][/QUOTE]

I see you and raise the ghetto version.

[video=youtube;7_Wh6i8Hb6c]http://www.youtube.com/watch?v=7_Wh6i8Hb6c[/video]

[TCWilliamson]

[QUOTE=Fuxed;44626675]I see you and raise the ghetto version.

[video=youtube;7_Wh6i8Hb6c]http://www.youtube.com/watch?v=7_Wh6i8Hb6c[/video][/QUOTE]

I think the DARPA version shown in the video is working as a set of lines running in X and a set of lines running in Y. Its kind of like a 2D 'Liniar' motor, as opposed to the traditional 1D Liniar motor.

I think it would be quite easy to make somthing up like this at home really. The big isse is actually driving the damned thing. (how to drive 500-1000 IOs pulsed at specific points around 2 Amps or so.

oooh~ Look what i found:
[url]http://machinedesign.com/news/novel-dual-axis-linear-motor-gives-xy-base-fast-moves[/url]

[DrLuke]

[QUOTE=nuttyboffin;44627156]how to drive 500-1000 IOs pulsed at specific points around 2 Amps or so.
[/QUOTE]

It's easy if you're DARPA and ergo can spin your own ICs.

[TCWilliamson]

[QUOTE=DrDevil;44627313]It's easy if you're DARPA and ergo can spin your own ICs.[/QUOTE]

While they can do that, i don't believe they would have in this case... not enough needed. I would imagine they are just using some run of the mill IC out there.

[Zero-Point]

Maybe it's not even a lot of IOs, it may just be multiple "rungs" with PWM to vary the strength of the magnetic field affecting the magnets, like micro-stepping.

[RoflKawpter]

So, I found this old IBM Personal System/2 Model 50Z (along with the Model M) at a neighbours house who let me keep it as long as I wiped the HDD, so decided to open it and see what's inside!

[thumb]https://dl.dropboxusercontent.com/u/23344247/Public%20Photos/2014-04-23%2019.28.13.jpg[/thumb]
[thumb]https://dl.dropboxusercontent.com/u/23344247/Public%20Photos/2014-04-23%2019.29.41.jpg[/thumb]
[thumb]https://dl.dropboxusercontent.com/u/23344247/Public%20Photos/2014-04-23%2019.30.04.jpg[/thumb]

Hey MIIIIIIIIIIIIIPS (or anyone who knows things about old computer parts), anything here that might be worth anything of any value?

Not sure if it boots, cause I don't have a monitor I can use (Bloody port's older than VGA!!)

[Zero-Point]

Pics of the graphics port? Google searches show that it has a VGA connection.

[RoflKawpter]

[QUOTE=Zero-Point;44628326]Pics of the graphics port? Google searches show that it has a VGA connection.[/QUOTE]

There's two VGA'ish ports on this thing.

[thumb]https://dl.dropboxusercontent.com/u/23344247/Public%20Photos/2014-04-23%2019.52.45.jpg[/thumb]
[thumb]https://dl.dropboxusercontent.com/u/23344247/Public%20Photos/2014-04-23%2019.52.17.jpg[/thumb]

I believe from my limited knowledge of old computer parts that one of them is a serial port? The other one looks like VGA but it has a pinhole missing...

[Zero-Point]

Bottom one is most likely a serial port, top one is the one you want. Not sure what to do about that missing hole though. There DO appear to be VGA cables that accommodate that missing pin, however.

*edit* Quick search shows that as just a ground connection, so not a real issue that it's missing.

Also, if that thing works you might get a decent amount of DOSH out of it. That Model M keyboard alone is highly sought after last I heard.

[pentium]

The computer is VGA internally. The cards are 3270 emulation and token ring along with a Microchannel hard disk.

The missing pin on the VGA port is normal. There used to be a time when that was normal but they added it back in because they needed an extra DDC pin.

[paindoc]

Alright so tried switching back to a MOSFET today.

It didn't work :/

Using a BUZ91A MOSFET to drive a 12v 6A peltier still, controlling it through an arduino mega 2560 using the circuit shown here;

[t]http://bildr.org/blog/wp-content/uploads/2012/03/rfp30n06le-arduino-solenoid-400x218.png[/t]

Running this code;

#define MOSFET 3

void setup(){
  pinMode(MOSFET, OUTPUT);  
}

void loop(){

 analogWrite(MOSFET, 127);

  
}

}

I have tried running it at 5, 55, 127, 200, and 255 and it consistently output 1.27A- however, when it had a LV7805 voltage regulator hooked up to it as well (outputting 5V to the arduino) it gave consistent 2.2A. Am I just missing something here? i am completely out of ideas

[Zero-Point]

[QUOTE=paindoc;44629601]Alright so tried switching back to a MOSFET today.

It didn't work :/

Using a BUZ91A MOSFET to drive a 12v 6A peltier still, controlling it through an arduino mega 2560 using the circuit shown here;

[t]http://bildr.org/blog/wp-content/uploads/2012/03/rfp30n06le-arduino-solenoid-400x218.png[/t]

Running this code;

#define MOSFET 3

void setup(){
  pinMode(MOSFET, OUTPUT);  
}

void loop(){

 analogWrite(MOSFET, 127);

  
}

}

I have tried running it at 5, 55, 127, 200, and 255 and it consistently output 1.27A- however, when it had a LV7805 voltage regulator hooked up to it as well (outputting 5V to the arduino) it gave consistent 2.2A. Am I just missing something here? i am completely out of ideas[/QUOTE]

This might help you.
[url]http://www.electronics-tutorials.ws/transistor/tran_7.html[/url]

What voltage were you using to control it initially?

[paindoc]

[QUOTE=Zero-Point;44629667]This might help you.
[url]http://www.electronics-tutorials.ws/transistor/tran_7.html[/url]

What voltage were you using to control it initially?[/QUOTE]

Input from the PSU should be 12v flat but we were getting a lower voltage on the output, what exactly escapes me

[alexaz]

[QUOTE=paindoc;44629708]Input from the PSU should be 12v flat but we were getting a lower voltage on the output, what exactly escapes me[/QUOTE]

Are you saying that the voltage of the PSU isn't 12 V when the peltier is on? In that case it sounds like your power supply can't supply more than 1.27A.

[Zero-Point]

Not sure if you guys have seen this yet, but:
[media]http://www.youtube.com/watch?v=CocjUyqD100[/media]

Just imagine how much easier certain shit will be!

[pentium]

I have a stepper motor setup here with gremlins.
The motor rotates fine when the device is both powered and unpowered and half the time under computer control it will step properly however the other half the time you can instruct it to move and it will emit an angry buzz so you try to turn it by hand and the shaft seems locked in place like a channel is stuck on. Does sound like a bad driver or a rogue signal coming into the driver?

[DrLuke]

Have you tried probing both the input and output with an oscilloscope?

[pentium]

Not yet. Steppers are not in my region of knowledge.

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[LoneWolf_Recon]

Um...what?

[DrLuke]

[QUOTE=LoneWolf_Recon;44634082]Um...what?[/QUOTE]

It's a spambot from china