[QUOTE=chipset;40404684]You can never have too many.
Also, please take a [url="http://25.media.tumblr.com/tumblr_lxiq57hQKW1r6p97to1_500.jpg"]"I can't I hold all these pcb's?"[/url] pic.[/QUOTE]
It actually was really hard to hold all those PCBs in one hand
Were they not buried under a mountain of dust at my parent's house I'd show you my PCB collection.
Hell I have one at work that I still need to bring home, full of motor speed control boards, old thermostat boards, furnace control boards, ice machine boards, etc.
[QUOTE=Zero-Point;40415231]Were they not buried under a mountain of dust at my parent's house I'd show you my PCB collection.
Hell I have one at work that I still need to bring home, full of motor speed control boards, old thermostat boards, furnace control boards, ice machine boards, etc.[/QUOTE]
Those are actually boards I made, not scrapboards. I just had to go through several revision because QFN packages are a bitch.
Trading cryptocurrencies is the most stressful thing I've ever done.
Funny thing is since I don't have any real volume to trade all my profits/losses are in the order of single dollars per trade so it's not really a big deal.
Mining is what's making me the real dough, $160 a month at current rates, more if the value keeps rising.
[QUOTE=chipset;40415825]Trading cryptocurrencies is the most stressful thing I've ever done.
Funny thing is since I don't have any real volume to trade all my profits/losses are in the order of single dollars per trade so it's not really a big deal.
Mining is what's making me the real dough, $160 a month at current rates, more if the value keeps rising.[/QUOTE]
wot?
[QUOTE=chipset;40415879][url]http://en.wikipedia.org/wiki/Bitcoin[/url][/QUOTE]
How is that relevant to anything electronics?
Unless you've been designing your own ASIC
[QUOTE=Van-man;40415888]How is that relevant to anything electronics?
Unless you've been designing your own ASIC[/QUOTE]
Yes how dare I bring up something only tangentially related to electronics in a thread that gets 2 posts/day on a good day.
I'm gonna stop posting here now.
I need a way to step up 12 volts from a battery to 24 volts at 1.5 amps. I was thinking of a square wave and a little transformer at a 1:2 ratio. Would this work well or i need to look for something else? Also, this is for an audio amplifier.
I have a 130 x 67 x 40 project box.
What to do?
[QUOTE=alexaz;40418135]I need a way to step up 12 volts from a battery to 24 volts at 1.5 amps. I was thinking of a square wave and a little transformer at a 1:2 ratio. Would this work well or i need to look for something else? Also, this is for an audio amplifier.[/QUOTE]
The best way would be to use a boost converter, you can buy these in IC form or DIY your own.
A transformer would also work but I don't often see power transformers with a 1:2 ratio, that shit is more for signal coupling and isolation.
[QUOTE=chipset;40415913]Yes how dare I bring up something only tangentially related to electronics in a thread that gets 2 posts/day on a good day.
I'm gonna stop posting here now.[/QUOTE]
I actually want to get a Xilinx Spartan-6 LX9 dev board to fuck around with making my own miner on. That'd be really fun.
[QUOTE=Chryseus;40418158]I have a 130 x 67 x 40 project box.
What to do?
The best way would be to use a boost converter, you can buy these in IC form or DIY your own.
A transformer would also work but I don't often see power transformers with a 1:2 ratio, that shit is more for signal coupling and isolation.[/QUOTE]
Wouldn't it be easy to wind your own transformer? Atleast in school i was teached that transformers is as easy as wrapping a piece wire around a ferrite core and you got a perfect transformer.
As for the boost converter i couldn't find anything that would fit my requirements. Most of theese chips have a 5v max in and low output currents. The only thing i could see fitting here is MC34063, but i don't understand whether the max switch current of this chip is the same as the Ipeak for the inductor and diode ( which under my requirements its well over the 1.5 amps, its 5.5 amps ).
Finally, would this fit?
[url]http://www.ladyada.net/library/diyboostcalc.html[/url]
It says its mostly used for powering constant loads, so i'm worried that the amplifier isn't too "constant load".
[QUOTE=alexaz;40418287]Wouldn't it be easy to wind your own transformer? Atleast in school i was teached that transformers is as easy as wrapping a piece wire around a ferrite core and you got a perfect transformer.
As for the boost converter i couldn't find anything that would fit my requirements. Most of theese chips have a 5v max in and low output currents. The only thing i could see fitting here is MC34063, but i don't understand whether the max switch current of this chip is the same as the Ipeak for the inductor and diode ( which under my requirements its well over the 1.5 amps, its 5.5 amps ).
Finally, would this fit?
[url]http://www.ladyada.net/library/diyboostcalc.html[/url]
It says its mostly used for powering constant loads, so i'm worried that the amplifier isn't too "constant load".[/QUOTE]
Winding your own transformer is possible.
Most boost converter ICs can operate with an external transistor to pass much greater currents, Linear do a bunch of good boost converters.
Also yes designing your own would work, peak current is peak, inductors are rated for RMS current so something rated for 1 to 2 amps should do the job.
You'd be best however to put a standard linear regulator on the end to reduce variation in load voltage since that simple design does not utilise feedback.
Here is a better design of my own that can maintain regulation (excuse the mess)
[img]http://i.imgur.com/gvixP.png[/img]
V4 is a square wave of about 10kHz (you might want to play with it), Q1 and Q2 should be a mosfet instead with low RDS(on) for optimal performance, V3 is the set voltage, R1 and R3 set the feedback ratio (adjust as needed), R2 in practice is your load.
FFS, can't find Eagle libraries for any common & cheap high frequency ESD clamp IC's, nor for Displayport receptacles.
[QUOTE=Van-man;40419151]FFS, can't find Eagle libraries for any common & cheap high frequency ESD clamp IC's, nor for Displayport receptacles.[/QUOTE]
Welcome to PCB design.
You usually have to make your own.
[QUOTE=Van-man;40419151]FFS, can't find Eagle libraries for any common & cheap high frequency ESD clamp IC's, nor for Displayport receptacles.[/QUOTE]
Making your own stuff goes really fast once you get the hang of it.
So, I got to dumpster dive at the place my mom works, they had an absolutely massive amount of electronics, I should probably have brought a trailer with me. :V:
This is the loot for now:
[T]http://i.imgur.com/FOjQpPi.jpg[/T]
Lots of transformers, a 500VA one too (the massive grey one), lots of power supplies. The black one is an 800W 24V one. And 3 perfectly working lab PSU's in the background, two of then are 0-30V 1A, +- 12/15V and 2x 5V, all individually isolated grounds. and a fixed output one. Lots of heat-sinks too! :D (and about 30-40 computers just sitting there, brought one of those home too).
I think there were like 30-40 of the 800W psu's. Oh, and lots of laser tubes. Brought home a few of those too.
Edit: Just weighed the grey 500VA transformer, it weighs 6kg.
[QUOTE=DrLuckyLuke;40419348]Making your own stuff goes really fast once you get the hang of it.[/QUOTE]
I used to use Eagle, but now i use Diptrace just because the part creation is incredibly much faster. You guys should try it.
Also i built this boost converter just because i had the parts laying around.
[url]http://www.ladyada.net/library/diyboostcalc.html[/url]
Not sure if anything i did was wrong, but fuck, with no load the FET was wasting ~10 watts of power. How could i limit the current?
EDIT: Nevermind tho, i'll get some new mosfets tomorrow ( guess what happened lol ) and try the Chryseus' design.
[QUOTE=alexaz;40420613]I used to use Eagle, but now i use Diptrace just because the part creation is incredibly much faster. You guys should try it.
Also i built this boost converter just because i had the parts laying around.
[url]http://www.ladyada.net/library/diyboostcalc.html[/url]
Not sure if anything i did was wrong, but fuck, with no load the FET was wasting ~10 watts of power. How could i limit the current?
EDIT: Nevermind tho, i'll get some new mosfets tomorrow ( guess what happened lol ) and try the Chryseus' design.[/QUOTE]
Doesn't have middle mouse button panning, 1/10, wouldn't use
(seriously though, the library selection thing looks really crappy)
[QUOTE=DrLuckyLuke;40420674]Doesn't have middle mouse button panning, 1/10, wouldn't use
(seriously though, the library selection thing looks really crappy)[/QUOTE]
Wat? It does have middle mouse panning. I agree tho on the library selection thing. Its absolute shit and the component search is slow as fuck, but i'd rather have those problems than the slow ass and frustrating part creation in eagle.
[url]http://dangerousprototypes.com/2012/03/07/how-to-make-parts-in-cadsoft-eagle[/url]
Guess friday is gonna be fun eagle frustration day.
[QUOTE=Van-man;40421958][url]http://dangerousprototypes.com/2012/03/07/how-to-make-parts-in-cadsoft-eagle[/url]
Guess friday is gonna be fun eagle frustration day.[/QUOTE]
Why? Making parts is straight forward.
I got an arduino today.
[img]http://i.imgur.com/tNFdzl3.png[/img]
It needlessly uses a breadboard with an alteration of the blink script to only operate when the arduino is on, thus powering the 9 slot.
Redundancy :v:
For the first time in months I've messed around with my Raspberry Pi. I had some ds18b20 temperature sensors that I was going to use for a project that I never got around to doing, so I decided to try getting them talking to each other. I was a dumbass and thought the pinout I found was somehow the view from the top, so I wired the sensor up backwards... I was curious why the Pi was giving me a ton of errors when booting up, so I had the bright idea to touch one of the sensors. Four hours later, the mark is still there...
Though once I realized my mistake, I fixed it and luckily the Pi and sensor seem to work!
[IMG]http://puu.sh/2HcBg.jpg[/IMG]
I figured out the basics of bash and modified a scr that spits out the data from the sensors:
[code]
#!/bin/bash
while :
do
temp1=`cat /sys/bus/w1/devices/28-000002dc0390/w1_slave | tail -n 1 | cut -d= -f2`
temp1C=$(echo "scale=3; $temp1/1000" | bc -l)
temp2=`cat /sys/bus/w1/devices/28-000002dc0671/w1_slave | tail -n 1 | cut -d= -f2`
temp2C=$(echo "scale=3; $temp2/1000" | bc -l)
echo `date +"%y-%m-%d %T"`' Temp1: '$temp1C ' Temp2: ' $temp2C
done
[/code]
Which gave me this as the output:
[IMG]http://puu.sh/2HcAs.png[/IMG]
I get some errors occasionally, which I can replicate by pulling out the sensor from the breadboard.
[url]http://puu.sh/2HcYZ.png[/url]
Though it seems like that's just the value it gives me when it either doesn't find the 1wire device I'm asking for and/or when the CRC fails.
[code]
pi@raspberrypi ~ $ cat /sys/bus/w1/devices/28-000002dc0671/w1_slave
ff ff ff ff ff ff ff ff ff : crc=c9 NO
7f 01 4b 46 7f ff 01 10 33 t=-62
[/code]
Last night I on eBay and bought a five pack of pin headers for my Pi, so I can hook things up to it without my junk-box connectors.
I also bought this: [url]http://www.ebay.ca/itm/170819064718#ht_2740wt_1097[/url] , two 2.4GHz wireless trancievers. I'm interested in getting my Teensy and Pi talking together wirelessly and it looks like this is going to be easiest way. For a few bucks, it's worth trying out, I guess.
How do you guys get power onto a board? Barrel jacks, pin headers, wire-to-board connectors, terminal blocks or just solder the power leads right to the board?
[QUOTE=alexaz;40433608]How do you guys get power onto a board? Barrel jacks, pin headers, wire-to-board connectors, terminal blocks or just solder the power leads right to the board?[/QUOTE]
It depends what I'm doing, usually I just use some croc clips to connect the power, for something finished I'll go for PCB mount terminal blocks unless it's something which I'd use quite often, in that case a DC power jack with an internal regulator or if possible a mains transformer.
For something your building for yourself which method you use really does not matter.
So I thought working with a 100pin TQFP chip was going to be hell, then I found [URL="http://www.ebay.com/itm/1x-TQFP-44-100pin-0-5mm-QFP-32-100pin-0-65mm-DIP-Adapter-Convertor-/170908058568?_trksid=p2050601.m2372&_trkparms=aid%3D111000%26algo%3DREC.CURRENT%26ao%3D1%26asc%3D250%26meid%3D7245590943356262465%26pid%3D100085%26prg%3D1112%26rk%3D4%26sd%3D271169033598%26%26clkid%3D7245596708253304639&_qi=RTM1303755"]these[/URL]:
[IMG]http://i.ebayimg.com/t/1x-TQFP-44-100pin-0-5mm-QFP-32-100pin-0-65mm-To-DIP-Adapter-Convertor-/00/s/NjAwWDYwMA==/$(KGrHqYOKiQE5+Kcd()LBOqtoO!Q,g~~60_3.JPG[/IMG]
Gotta love simple ideas.
Posted in WAYWO by mistake. :|
Got my Arduino a few days ago, refamiliarizing myself with multi-threading and device communication, I turned my board into a crude [del]oscilloscope[/del] sinewavey thing.
[img]http://i.imgur.com/OFlbwX4.png[/img]
Yay! Now to get my colour sensor hooked up to this thing.
I'm just learning. I followed [url=http://playground.arduino.cc/Interfacing/CPPWindows]this lovely tutorial[/url] to make a UI button to blink an arduino light.
[QUOTE=Cakebatyr;40438106]Got my Arduino a few days ago, refamiliarizing myself with multi-threading and device communication, I turned my board into a crude [del]oscilloscope[/del] sinewavey thing.
[img]http://i.imgur.com/OFlbwX4.png[/img]
Yay! Now to get my colour sensor hooked up to this thing.[/QUOTE]
Are you planning to make a chromatograph?
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