1. Post #201
    www.bff-hab.de
    Dennab
    February 2009
    7,832 Posts
    EEVBlog
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  2. Post #202
    Gold Member
    Tw34k's Avatar
    January 2012
    693 Posts
    I saw that coming. His video on hacking the rigol did influence me on buying it I must admit.

    The right word is budget.
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  3. Post #203
    Gold Member
    VistaPOWA's Avatar
    October 2008
    8,370 Posts
    The first thing I'll do when I get $350 of spare money (read: never) is to buy a Rigol scope. It just looks so sexy.
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  4. Post #204
    chipset's Avatar
    November 2010
    2,263 Posts
    So I have this Telequipment serviscope minor, it's crappy brittish oscilloscope from the 60's dad got from a school he worked at. It had a blown fuse so fixing it took minutes. It's rather pointless for actual usage as it was designed for school use and to be used with preconfigured experiments, which means the dials have no markings so there's no way to know what the hell you're looking at.
    However as an antique it's quite awesome, it has a total of 6 vaccum tubes inside:
    brimar ef134 x2
    brimar ez80
    mazda 6bw7
    mullard eb91
    mullard ecc81 12at7
    And also it has a wonderful PCB with those ye olde swirvy traces as oposed to the angular ones of today.
    It's quite beautiful but all it's doing is collecting dust and I feel I'm not the right person to appreciate something like this. Does anyone know what I could get if I sold it?
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  5. Post #205
    www.bff-hab.de
    Dennab
    February 2009
    7,832 Posts
    you could get some known frequencies and find out the time/divs.
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  6. Post #206
    Gold Member
    Chryseus's Avatar
    February 2009
    2,447 Posts
    Just took apart my old crappy Lexmark inkjet printer
    Loot:

    30V 500mA supply (switchmode)
    Two AC motors of unknown rating, probably 15-30V
    One stepper motor
    Two very nice large inductors on ferrite core
    A bunch of caps, diodes, transistors, etc
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  7. Post #207
    Gold Member
    Disarray's Avatar
    October 2006
    1,156 Posts
    Hey all, at university we have been given a group design project which involves an Arduino. We have also been given a small kit of components but i am having trouble identifying what this is:



    If anyone could help that would be great.

    Thanks.
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  8. Post #208
    Gold Member
    Chryseus's Avatar
    February 2009
    2,447 Posts
    Did you think of putting the part number in google ?
    1st result http://www.zymcu.com/datasheet/device/4n35.pdf
    *sigh*
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  9. Post #209
    Gold Member
    Disarray's Avatar
    October 2006
    1,156 Posts
    I did but I couldn't find anything about it. Apparently I am blind though. Thanks.
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  10. Post #210
    www.bff-hab.de
    Dennab
    February 2009
    7,832 Posts
    I ordered wire and got a bag of candy.
    Well, the slow shipping shall be forgiven.

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  11. Post #211
    Gold Member
    Chryseus's Avatar
    February 2009
    2,447 Posts
    I never get any candy ;-(
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  12. Post #212
    www.bff-hab.de
    Dennab
    February 2009
    7,832 Posts
    I never get any candy ;-(
    Well, you only get candy when you order in the bad evil nazi germany
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  13. Post #213
    Gold Member
    Bambo.'s Avatar
    April 2011
    487 Posts
    I really want to get into electronics however i'm really unsure where to start, i have a firm knowledge of some electronics such as logic gates, bistable latches, adders and lots of the simple things however i'd love to create these ideas in real life rather than things like Minecraft and logic simulators online.

    I'm also pretty well versed in programming C and C++.

    Any suggestions?
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  14. Post #214
    Gold Member
    Van-man's Avatar
    August 2009
    15,159 Posts
    Hey all, at university we have been given a group design project which involves an Arduino. We have also been given a small kit of components but i am having trouble identifying what this is:



    If anyone could help that would be great.

    Thanks.
    I find it funny that a friend of mine asked for help with using THAT EXACT type of chip with a arduino to control some somewhat beefy relays.
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  15. Post #215
    www.bff-hab.de
    Dennab
    February 2009
    7,832 Posts

    Made me chuckle
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  16. Post #216
    Gold Member
    Chryseus's Avatar
    February 2009
    2,447 Posts
    I really want to get into electronics however i'm really unsure where to start, i have a firm knowledge of some electronics such as logic gates, bistable latches, adders and lots of the simple things however i'd love to create these ideas in real life rather than things like Minecraft and logic simulators online.

    I'm also pretty well versed in programming C and C++.

    Any suggestions?
    First buy a breadboard, jumpers, multimeter and a good selection of components from somewhere reasonably priced. (I.E Bitsbox, RS, Farnell, Ebay, DealExtreme)
    Once you have that done you can start experimenting (blowing shit up) , don't forget to read every book or bit of information you can get your hands on, make sure you know Ohm's Law, Joule's Law and basic resistive circuits before doing anything or you'll be seeing lots of smoke.
    Lastly buy an Arduino so you can hop on the bandwagon.
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  17. Post #217
    Gold Member
    0lenny0's Avatar
    March 2010
    412 Posts
    First buy a breadboard, jumpers, multimeter and a good selection of components from somewhere reasonably priced. (I.E Bitsbox, RS, Farnell, Ebay, DealExtreme)
    Once you have that done you can start experimenting (blowing shit up) , don't forget to read every book or bit of information you can get your hands on, make sure you know Ohm's Law, Joule's Law and basic resistive circuits before doing anything or you'll be seeing lots of smoke.
    Lastly buy an Arduino so you can hop on the bandwagon.
    I know those (and more) laws from school and i still see allot of smoke.
    I do admit that i am kinda clumsy. I am surprised that after all my accidents i still experiment.
    Today i got a screwdriver with full force in my thumb.. twice! Or my all time favorite, hitting the iron with my hands.
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  18. Post #218
    www.bff-hab.de
    Dennab
    February 2009
    7,832 Posts


    My first selfwound toroid coil ever. I think it looks pretty neat.
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  19. Post #219
    RISC MASTER RACE.
    MIPS's Avatar
    August 2010
    7,101 Posts
    Found a 12-bit A/D converter chip that had been tossed because someone had cut all the gold leads off it.
    I added new leads.


    Not sure what I could use this for.
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  20. Post #220
    Gold Member
    Lapsus's Avatar
    June 2006
    1,077 Posts
    Having a peek at the FPGA's demo code for VGA output to see what I should be aiming for output-wise, going to have another crack at it once I've gotten some sleep.

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  21. Post #221
    Gold Member
    Lapsus's Avatar
    June 2006
    1,077 Posts


    Code:
    module newvga(CLOCK_50, LEDG, VGA_CLK, VGA_HS, VGA_VS, VGA_BLANK, VGA_SYNC, VGA_R, VGA_G, VGA_B);
    
    	input CLOCK_50; // 50MHz Clock
    
    	output [8:0]LEDG; // indicators woo
    	
    	output VGA_CLK;    // DACs latch on posedge
    	output VGA_HS;     // Horizontal Sync -----+ 
    	output VGA_VS;     // Vertical Sync -------| Active Low
    	output VGA_BLANK;  // Blanking ------------+
    	output VGA_SYNC;   // Unused
    	output [9:0]VGA_R; // 
    	output [9:0]VGA_G; // Output DACs, 10 bit, 0-2047
    	output [9:0]VGA_B; // 
    	
    	// Clock Setup
    	reg [1:0]ClockDiv;
    	reg Clock_25;
    	
    	always @(posedge CLOCK_50) begin
    		ClockDiv = ClockDiv + 1;
    	end
    	
    	assign Clock_25 = ClockDiv[0]; // 50MHz / 2 = 25MHz, close enough to the 25.175 MHz in the spec
    
    	reg [10:0]Horiz_Count;
    	reg [10:0]Vert_Count;
    	
    	reg Hsync;
    	reg Vsync;
    	reg [9:0]Red;
    	reg [9:0]Green;
    	reg [9:0]Blue;
    	
    	assign LEDG[0] = Clock_25; // These aren't all that useful, it's too fast to see the blinking.
    	assign LEDG[1] = Hsync;		//
    	assign LEDG[2] = Vsync;		//
    	
    	assign VGA_CLK = Clock_25;
    	assign VGA_HS = !Hsync;		// Chip inputs are active low, so invert them.
    	assign VGA_VS = !Vsync;
    	assign VGA_BLANK = !Hsync | !Vsync; // When we're doing sync, blank!
    	assign VGA_SYNC = 1'b1; // Unused
    	assign VGA_R = Red;
    	assign VGA_G = Green;
    	assign VGA_B = Blue;
    	
    	/* Timings! http://tinyvga.com/vga-timing/640x480@60Hz
    		
    		Horizontal:
    		Visible 		640
    		Front Porch 16
    		Sync 			96
    		Back Porch 	48
    		Total 		800
    		
    		Vertical:
    		Visible		480
    		Front Porch	10
    		Sync			2
    		Back Porch	33
    		Total			525
    	*/
    	
    	always @(posedge VGA_CLK) begin
    		if (Horiz_Count < 801) begin
    			Horiz_Count = Horiz_Count + 1;
    			if (Horiz_Count == 17) begin
    				Hsync = 1;
    			end
    			if (Horiz_Count == 112) begin
    				Hsync = 0;
    			end
    		end else begin
    			Horiz_Count = 0;
    			if (Vert_Count < 526) begin
    				Vert_Count = Vert_Count + 1;
    				Green = Vert_Count;
    				if (Vert_Count == 11) begin
    					Vsync = 1;
    				end
    				if (Vert_Count == 13) begin
    					Vsync = 0;
    				end
    			end else begin
    				Vert_Count = 0;
    			end
    		end	
    	
    		if (Horiz_Count[6] == 1) begin
    			Red = 10'b1111111111;
    		end else begin
    			Red = 10'b0000000000;
    		end
    		
    		if (Horiz_Count[7] == 1) begin
    			Green = 10'b1111111111;
    		end else begin
    			Green = 10'b0000000000;
    		end
    		
    		if (Horiz_Count[8] == 1) begin
    			Blue = 10'b1111111111;
    		end else begin
    			Blue = 10'b0000000000;
    		end
    	end
    	
    endmodule
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  22. Post #222
    Gold Member
    ruarai's Avatar
    December 2009
    1,376 Posts
    I finally understand half of the shit I didnt, thanks to this: http://www.falstad.com/circuit/
    Though i'd post it since its pretty in-depth
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  23. Post #223
    Gold Member
    Chryseus's Avatar
    February 2009
    2,447 Posts
    I finally understand half of the shit I didnt, thanks to this: http://www.falstad.com/circuit/
    Though i'd post it since its pretty in-depth
    Just don't expect it to be too accurate, like all simulators the real circuits tend to behave rather differently, even worse java circuit sim does not support proper device models.
    It's fine for simple circuits where your trying to gain an understanding of how they work but you should not rely on it.
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  24. Post #224
    www.bff-hab.de
    Dennab
    February 2009
    7,832 Posts
    They're idealized models, i.e. perfect components. Real components usually behave very differently, i.e unidealized.
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  25. Post #225
    SubbyV-2's Avatar
    January 2011
    273 Posts
    They're idealized models, i.e. perfect components. Real components usually behave very differently, i.e unidealized.
    Say that to the mosfet model, Chryseus and I use analog switches instead.
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  26. Post #226
    Gold Member
    Kirth's Avatar
    July 2009
    429 Posts
    I ordered wire and got a bag of candy.
    Well, the slow shipping shall be forgiven.

    Even gummy bears sound oppressive in German.
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  27. Post #227
    www.bff-hab.de
    Dennab
    February 2009
    7,832 Posts
    Say that to the mosfet model, Chryseus and I use analog switches instead.
    Well, the resistance wouldn't be that different.
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  28. Post #228

    September 2010
    458 Posts
    Does anyone know how the AVRs compare to the MSP430?
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  29. Post #229
    www.bff-hab.de
    Dennab
    February 2009
    7,832 Posts
    Does anyone know how the AVRs compare to the MSP430?
    AVRs can be faster, MSP430s consume way less power
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  30. Post #230
    SubbyV-2's Avatar
    January 2011
    273 Posts
    Well, the resistance wouldn't be that different.
    You can change it on analog switches
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  31. Post #231
    Gold Member
    Chryseus's Avatar
    February 2009
    2,447 Posts
    MSP430 series is generally cheaper.
    Also free samples from Ti.
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  32. Post #232
    RISC MASTER RACE.
    MIPS's Avatar
    August 2010
    7,101 Posts
    Resistor Networks piss me off to no end.
    It's not hard to describe how they work. A simple diagram as seen in any datasheet is helpful.



    However the world is not perfect and I'm stuck trying to read shit like this:


    I'm having an incredible amount of trouble understanding what the fuck they are trying to show me here other than it's a resistor network DIP and only a few pins are actually numbered.
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  33. Post #233
    www.bff-hab.de
    Dennab
    February 2009
    7,832 Posts
    Seems like it's a couple of voltage dividers to bias some input signal.
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  34. Post #234
    Gold Member

    March 2005
    3,028 Posts
    I'm having an incredible amount of trouble understanding what the fuck they are trying to show me here other than it's a resistor network DIP and only a few pins are actually numbered.
    Looks like they're trying to bias to ~3V.
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  35. Post #235
    RISC MASTER RACE.
    MIPS's Avatar
    August 2010
    7,101 Posts
    Looks like they're trying to bias to ~3V.
    That is indeed what it's trying to do because the disk drives I have use a 3V signalling rate.
    Problem is that aside from pin 8 being ground I can't really determine what the other pins are doing.
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  36. Post #236
    www.bff-hab.de
    Dennab
    February 2009
    7,832 Posts
    Pin 6 seems to be +5V, pins 1-7 and 9 being the outputs with a not-gate on pin 9 and another one on pin 1 as an extra output.
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  37. Post #237
    Gold Member
    Chryseus's Avatar
    February 2009
    2,447 Posts
    The resistors are just being used as 3V pull ups.
    That schematic is relatively simple compared to some I've seen.
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  38. Post #238
    RISC MASTER RACE.
    MIPS's Avatar
    August 2010
    7,101 Posts
    Pin 6 seems to be +5V, pins 1-7 and 9 being the outputs with a not-gate on pin 9 and another one on pin 1 as an extra output.
    Pin 6 however is noted twice. Once for +5V, the other time for a pin that goes to another chip which which does NOT want that +5v.
    Pins 10-16 are still missing and a DMM says that they are active.
    I really need the datasheet for this thing. Can anyone get better search results for a 1311003(-01?) 16 pin DIP resistor network? Google says people know of it but they don't offer a datasheet and the part number on the schematic only gives me the DEC part number and I lack the microfiche with the part tables on it.
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  39. Post #239
    www.bff-hab.de
    Dennab
    February 2009
    7,832 Posts
    Cool, the Raspberry Pi is out, but the first batch is already sold out.
    You can order them on RS and Farnell, but Farnell has been effectively DDOS'd and RS seems to only sell to companies.
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  40. Post #240
    Gold Member
    VistaPOWA's Avatar
    October 2008
    8,370 Posts
    Ordered 100 RGB LEDs for about $8, got them tomorrow.

    I noticed that it has only 2 pins. Oh well, it must be using specific voltages for specific colours, I thought.

    I was wrong. I put it in a circuit, and I have noticed it scrolls through the colours. I thought it must be PWM or something.

    Then, leaving it on for a minute I noticed something. It did blink patterns, just like some christmas light would do, then I noticed there is SMD stuff inside. My fear that I threw $8 out of the window was right.

    These are fucking christmas lights.
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