Electrical Engineering V3 - Developers

[QUOTE=LoneWolf_Recon;47416198]Odd, that works in LTSpice. However I'd try swapping out that 1kohm with a lower value resistor as your mosfet has no gate current going to it (Thus the transistor in the 4N25 can fully saturate) and thus allowing your mosfet gate to fully saturate. First test your mosfet to make sure it isn't dead, probably just by removing the 1kohm/4N25 and directly connecting the gate to 12V (with the 10kohm still connected to pull down/remove static). My suspicion may be the 4N25, but why have the 5V square wave source when you could just have that sourcing the LED directly?[/QUOTE] Figured out the problem. The power supply had short protection and was being a bitch. It was seeing the 4ohm load as a short. I changed the 1k resistor with a 120ohm one too.

[QUOTE=Chryseus;47424474]The problem was due to OH going high impedance rather than pulling low, thus it was powered through the output PNP (not shown), R5 and R4 so it continued to operate. Simple fix: [t]http://i.imgur.com/3gJbaG3.png[/t] Woops forgot a resistor. [t]http://i.imgur.com/EiVh4Bc.png[/t][/QUOTE] Chryseus got it. I owe you a beer for having to put up with my retardation again. :v:

why are the screw holes on an Arduino (Uno) not in line with eachother was it [I]really[/I] that hard to place them in a rectangular setup like for example the raspberry has.

After I get my sleep schedule into a working state this week, I'm going to try and draw up an Uno in KiCad. I've been meaning to design my own Uno for a while, except replace the stock USB header with microUSB, remove the stupid gaps on the IO pins, and figure out some sort of standard configuration for the screw holes. If I have space, I want a 2x5 male pin row that plugs into ground, I2C and hardware SPI, so I can just plug my logic analyzer straight into the board. I've never used KiCad so I figured that should be simple enough to learn it with. Oh and instead of the extra microcontroller, I'm going to use CH340G for serial-UART, it's cheap, readily available, and easy to solder.

[QUOTE=scratch (nl);47437893]why are the screw holes on an Arduino (Uno) not in line with eachother was it [I]really[/I] that hard to place them in a rectangular setup like for example the raspberry has.[/QUOTE] They were an afterthough. Same reason there's a odd spacing between two of the pin rows, so you can't make a shield with regular protoboard, although that's also a design flaw they never bothered to correct. Also only the A+ B+ and B2 rPI's have mounting holes in a rectangular pattern, the previous models didn't, and the first revision of the A and B sold to the public didn't have any mounting holes at all.

The B had two holes in it. Not exactly helpful though.

[QUOTE=Cakebatyr;47438934]The B had two holes in it. Not exactly helpful though.[/QUOTE] Not the very first batch sold to the public. [t]http://s8.postimg.org/ypf2m6r8l/20130927_095953.jpg[/t] Those were a limited production run, so they're rare.

I have one of the original Pi's and it doesn't have any holes, luckily I have it in a case so it doesn't really matter. I fully understand what you mean about the Uno though.

Shame there's not a hole template for Uno's in DipTrace (The measurements were annoying on my last shield), but there's a [URL="http://www.open-electronics.org/how-to-make-an-arduino-shield-with-eagle-cad-tutorial/"]tutorial/template avail for Eagle.[/URL]

[QUOTE=Van-man;47439256]Not the very first batch sold to the public. [t]http://s8.postimg.org/ypf2m6r8l/20130927_095953.jpg[/t] Those were a limited production run, so they're rare.[/QUOTE] So wait the 1st production run model B PIs don't have that? I have three of those laying around. Are they rare as in "worth something" or just neat to own?

[QUOTE=Mega1mpact;47442437]So wait the 1st production run model B PIs don't have that? I have three of those laying around. Are they rare as in "worth something" or just neat to own?[/QUOTE] The latter.

Speaking of raspi's, I still haven't received the two I ordered on pi day.

[QUOTE=Cakebatyr;47445589]Speaking of raspi's, I still haven't received the two I ordered on pi day.[/QUOTE] B2's? There's a insane demand for them now that they finally have a decent cpu and enough RAM for light desktop usage.

I got mine in a few days, looks like the vendor I bought them from has some more in stock too. [url]http://www.jimms.fi/tuote/832-6274[/url] There's demand, but supplies depend on where you buy them from.

Aaaaaaand here we go. [IMG]http://i11.photobucket.com/albums/a166/ballsandy/Computer%20related/IMG_8802.jpg[/IMG] [IMG]http://i11.photobucket.com/albums/a166/ballsandy/Computer%20related/IMG_8772.jpg[/IMG] [IMG]http://i11.photobucket.com/albums/a166/ballsandy/Computer%20related/IMG_8815.jpg[/IMG] [IMG]http://i11.photobucket.com/albums/a166/ballsandy/Computer%20related/IMG_8818.jpg[/IMG] [IMG]http://i11.photobucket.com/albums/a166/ballsandy/Computer%20related/IMG_8821.jpg[/IMG] [IMG]http://i11.photobucket.com/albums/a166/ballsandy/Computer%20related/IMG_8822.jpg[/IMG] [IMG]http://i11.photobucket.com/albums/a166/ballsandy/Computer%20related/IMG_8807.jpg[/IMG] [IMG]http://i11.photobucket.com/albums/a166/ballsandy/Computer%20related/IMG_8827.jpg[/IMG] Aside form the phone dialer STILL missing a resistor and capacitor and the microcontroller not yet being programmed it's finished and behaving well in testing.

Where can I get a potentiometer and capacitors that doesn't take a month to get to me? I have a project for school that I'm doing soon.

[QUOTE=Doritos_Man;47446774]Where can I get a potentiometer and capacitors that doesn't take a month to get to me? I have a project for school that I'm doing soon.[/QUOTE] Digikey

[QUOTE=Van-man;47445927]B2's? There's a insane demand for them now that they finally have a decent cpu and enough RAM for light desktop usage.[/QUOTE] Just Bs, $25 per on Sparkfun that day. Still useful: turn one into a TNC-Pi, one into a print server for an un-networked all-in-one.

[QUOTE=pentium;47446558]Aaaaaaand here we go. Aside form the phone dialer STILL missing a resistor and capacitor and the microcontroller not yet being programmed it's finished and behaving well in testing.[/QUOTE] What on earth are you building!?

[QUOTE=Mega1mpact;47448813]What on earth are you building!?[/QUOTE] [url=https://www.youtube.com/watch?v=HK2enP8IVhM]Remember than one scene from The Matrix?[/url]

[QUOTE=Mega1mpact;47448813]What on earth are you building!?[/QUOTE] [del][url=http://facepunch.com/showthread.php?t=1250138&p=43433374&viewfull=1#post43433374]A thing, complete with drama.[/url][/del] A device to contact 1977.

You Vancouver and coastal folks better be in Kelowna tomorrow. [url=http://www.sphere.bc.ca/test/index.html]Sphere Research[/url] is having another one of those freebie events. I'm going to go see if I can cash out the week with another nice haul of shit.

Sadly I'm working. If you happen across anything that could add to my repository of test equipment (which currently includes: $15 multimeter), such as a 'scope that would be cool.

So after the cost of gas and eight hours of driving spread over two days, we have this: [IMG]http://i11.photobucket.com/albums/a166/ballsandy/IMG_8832.jpg[/IMG] [IMG]http://i11.photobucket.com/albums/a166/ballsandy/IMG_8833.jpg[/IMG] [code] Pacific Measurement 1038 frame and Network Analyzer plugins Quantum Data 903 Video Generator Rackmounted ten channel geiger counter (military surplus) HP 3710A IF/BB Transmitter Empty rackmount case (I'll be moving a bitcoin miner into this former piece of NASA/JPL asset tagged property) HP 5532A Counter (nixies!) HP 3060A power supply Sorenson 10-12.5v power supply HP 3083A "Industrial Touch" terminal Tektronix NU900M Display (NuColor!) HP 8900B Peak Power Calibrator HP 436A Power Meter HP 3467A logging multimeter HP 5150A thermal printer BK 520B transistor tester Chrono488 GPIB chronograph Tektronix 2445B Oscilloscope HP 8620C sweep oscillator Phoenix Telecom analyzer (RS-232 stuff) Digomat 7601 Microhmmeter (it's 240v and all in german but it's got nixies in it) Aritsu MS96A Optical Spectrum Analyzer Standard Reference Labs TransCell-III/SC (10.0000v calibration source) Compaq Portable 386 HP 8731B PIN modulator HP 8732B PIN modulator JBT Vibrating Reed AC Frequency Meter Texas Instruments TMS320C5X DSP development kit (it's never been used..... ._.) SkyTrac VHF/GPS aircraft tracking device InterTek 900 Transistor tester Material Control Inc. Energy Monitor (with inductive amphenol clips) DataTran portable RS-232 toolbag Aircraft altimeter Random fiber optic cable 30kv high voltage probe 75 200v 1200uf capacitors 100 16v 1600uf capacitors 300 diodes 1000 LED's Three coaxial cables with N-type plugs Video transmitter set Soem other random crap. Like seriously, y'all are missing out. :v:

Goddamn, even the carpet is retro :v:

That Transistor tester is right outta 1979. Metal trim with Avocado and fake wood panelling. [IMG]http://i11.photobucket.com/albums/a166/ballsandy/IMG_8835.jpg[/IMG] This has more bling than my car. :v:

I'm on the other side of the bloody oceaaaaaaaaaaaaaaaaan I want some

Time to start donating all the equipment to the EE thread's secret volcano base think tank. :v:

Master plan is that equipment I end up not needing or is beyond what I can repair is loaned out to the Kamloops and Vancouver hackspaces for them to mess with. Condition is I get the gear back when they need to get rid of it so I can find another home for it for free as to avoid them trying to flip it. Anyways, spent an hour talking and fiddling with ddrl regarding the issues with the 2245B. Found out almost immediately it's not a 2245B but an earlier version that someone put the newer front on. Second was that the CPU was functioning but the display was totally misbehaving. Eventually I was feeling around the back to see if the fan was running and boom, the screen locked in and after adjusting the focus and position it was perfect. [img]http://i11.photobucket.com/albums/a166/ballsandy/IMG_8856.jpg[/img]

[QUOTE=pentium;47459422]That Transistor tester is right outta 1979. Metal trim with Avocado and fake wood panelling. [IMG]http://i11.photobucket.com/albums/a166/ballsandy/IMG_8835.jpg[/IMG] This has more bling than my car. :v:[/QUOTE] But can it cook?