/diy/ - Do It Yourself

thought you boston area /diy/ldoes might be interested.

>>194904
could work. but tbh i really didn't want to have to work very hard on this. i had the stuff lying around and wanted to smash them together Transformers style and get something cool.

and iirc dc-dc converters that put out the amperage i'd need are expensive.

>>194887
awesome, thanks!
>pic related

although this does kill my idea :|
i don't have 4 12v batteries lying around...

>>194880
here's the whole thing.

i am pretty sure this edit to the power supply will work. however i'm fuzzy on what to do with the red line.

>>194878
well shit.

here is the schematic for the power supply. will post full if asked.

so i found a schematic for my amp. and i see that it has 23 and 12vdc.

can this resurrect my batter idea at all?

>>194870
thanks for the idea, but i'm not looking to buy something. i have a shitty old amp and a deep cycle battery and i want to blast grunge music when i'm outside.

>>194865
well shoot. and no it's a transistor amp.

>>194859
ok. is there a way to find out exactly without plugging it in and testing it with a meter?

>>194830
so do you think it'll probably be 5vdc?

before i start ripping apart my old amp, anyone know how likely it is that the power supply puts out 12vdc?

>>194809
we are /diy/ldoes

anyone ever wired a deep cycle battery to a guitar amp?
if not, what is the loudest portable system you've made?

>buyfags take note
what is the loudest speker/boombox system i can plug into with a 3.5mm jack that i can buy?

>>192853
then go for it. i'm trying to couch what i'm saying, because i don't really know a lot about DSP stuff.

> research > my advice

also i'm always lurking/idling on the /diy/ irc channel so feel free to drop by and ping ideas off me.

>>192846
your PC does not have an xbee in it. you'll need to plug one in.

also your insistence that the xbee standard suits your throughput needs is suspect. i don't believe you actually have done the research to know what kind of throughput you can get with xbees.
i wil tell you right now that you're probably over estimate the throughput of an xbee. these devices, and the communication standard they implement are designed for reliable communication, not fast communication.

further: even if the xbee platform had the throughput you needed, my guess is that the micro on the arduino (atmel 328) doesn't have the mips to push all the data you want, as fast as you want it.

plus the sample rate/quality of an arduno will be small because of its limited ram. you'd need the audio samples to be buffered on your SD card.

before you start investing your hard earned scrilla on things. i suggest you think some more of the architecture of this project, and what kind of data will need to be handled/passed around.

>>192839
>voice input/output
too much data i/o for arduino. you should look into a more powerful platform. maybe invest in a rasberry pi (if they're even out yet) or some other ARM processor.

nevermind. ignore everything i just said. i didn't think you were serious when you said wi-fi.

if you want tcp packets you'll need to get an ethernet shield and plug the arduino into your router with a wire. as far as i know they don't make wifi arduinos.

>>192787
>been there, done that
adafruit makes a usb-uart adapter that you plug an xbee into.

there are a few xbee libraries for use on the host machine. i've only gotten one of them to work:http://code.google.com/p/xbee-api/
the bad news is it's a bloated pile of shit and written in java. however it's fully functional.

there's another one floating around that's in python and a third one in c. neither of which i've been able to get working. however i dev in linux, so you might have better success on windows(assuming you use windows because you gave no real information in your post).

there is also an xbee library for use on the arduino itself, which works really well. http://code.google.com/p/xbee-arduino/

alternatively, if you don't use much memory on the arduino, you could install the ROS (robot operating system) on your host machine and the arduino and use that to abstract away the communication. however it eats up most of a standard arduino's ram.

>>191587
bumping because i have those shoes and they are so fucking comfy

>>192001
dirty thief.
http://www.schneier.com/blog/archives/2010/08/cloning_retail.html
2 seconds on google.

>>191036
you could cut out everything but the H bridge.

or bit bang the ic.

>>190664
just helping out.