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  1. donkey

    Project Ideas

    could I start with your level of experience? and secondly Welcome to the forums thirdly have you seen anything that has caught your eyes so far? like the big bang theory where they put milk in a speaker... or remote controlled cars from across the internet? the Ideas are endless, the level of...
  2. donkey

    generating heat from AA battery

    if you can give us more detail as to what you're making we could brainstorm a little and maybe steer you in the right direction
  3. donkey

    -250mA

    going of the VIR triangle, having a positive voltage and a negative current means a negative resistance.... I have not heard of one of these. you could have a negative voltage though with a positive resistance giving a negative current. I don't see how to solve this without a FULL explanation...
  4. donkey

    problem solving

    add to the test question, multimeter, osciliiscope. add to the when question was there anything noticable like fire/smoke, a loud bang, a soft bang. the house lights went out due to a short and for the pictures.... blurry gives blurry answers. we can guess, but if the picture is really bad our...
  5. donkey

    problem solving

    I was thinking of showing people the best way of aaking for help in repair/troubleshooting was asking them the following questions. what is the device? where are pictures/ schematics? who made the device/schematics? why do you think its not working? when did it stop working? how have you...
  6. donkey

    Portable Mobile Phone charger

    if I can help I have found there are already a heap of portable chargers for mobile phones. I know its not as fun as making your own. the iphone seems to have a heap of solar panel ones, there is the dynamo ones and then a simple battery pack that plugs into the phone charging part.
  7. donkey

    solar

    thanks shark. I wasn't intending on using a 7ah battery I just wanted an example battery as i am still debating what I am running I am trying to figure out battery size, and panel size, just wanted the ratio's handy
  8. donkey

    solar

    wait my maths seems different to yours.... mine is watts/12volts = amp hours 120 watts/ 12 volts =10 ah so over 2 hours its 20 ah ... you say 10 ah.... how did you get that for 2 hours?
  9. donkey

    problem solving

    I was trying to figure out a flowchart for people to try before contacting us http://www.triz-journal.com/archives/1998/06/c/Image3.gif this one seemed nice but then i found.... http://cct370-w07.wikispaces.com/file/view/ProblemSolvingFlowchart.gif/30524546/ProblemSolvingFlowchart.gif I...
  10. donkey

    solar

    i got watt thingy sorted, but what about battery. they are rated in amp hours panels are in watts. if I supply 120 watts to a battery for 2 hours (hypothetically a flat 7amp hour battery, although going below 75% is not my intention) how "full" would the battery be? this is the part that is...
  11. donkey

    EMP Project!

    I was more thinking about large amount of energy, tin shed, good conductor with cement base.... may cause a real shocking experience.
  12. donkey

    EMP Project!

    why do people try starting with such dangerous projects with next to know experience? I have seen from a few similiar threads like this that no one who knows how to do this is willing to help for a few big reasons, 1 it has the ability to damage items in a LARGE area which makes it dangerous...
  13. donkey

    solar

    ok so what size battery would 120w panels charge over the course of a day and then what size would they charge over 5 days? am hoping someone can give me the formula so I can figure it out for myself from now on
  14. donkey

    solar

    ok I got a line on some el cheapo solar stuff, but now I got a few little questions to make it cheap I am getting the panels, no glass protection or casing. so I will make these myself. the question becomes what voltage should I aim for? alot of places I see go up to 18volts... is that too...
  15. donkey

    Need help (Atmega328)

    prctise on easy stuff first. breadboard stuff, then practise your soldering technique. and maybe pcb making. feel free to ask questions but start at the beginning and work up to micro controllers, or buy something like picduino/arduino and just use them to experiment on for now, they have screw...
  16. donkey

    input from 3 different power sources and battery backup

    http://www.ebay.com.au/itm/B02-Solar-Regulator-Charge-Controller-Charger-12V-24V-30A-Solar-Power-Panel-AU-/260952502691?pt=AU_Solar&hash=item3cc1fb31a3 I do NOT endorse this guy as I have NO knowledge of him. however scroll down to bout half way and he shows a diagram that shows how to charge a...
  17. donkey

    Sensor help?

    there are times when people overthink things. simple is the key, take the US space race for example 30million spent on a pen to write in space... USSR took a pencil. as for how to count thats a simple counting circuit, the "trigger" has to be the right thing though
  18. donkey

    no title

    ever seen something that you just thought WHY????? http://www.instructables.com/id/Flamethrowing-Jack-O-Lantern/ seriously.... why??? I know the answer was because he could... but seriously... why???
  19. donkey

    asking for a help

    http://www.instructables.com/id/Secret-Knock-Detecting-Door-Lock/ this is a start. it is activated by a secret knock..... as for voice recognition thats software... if you're good at programming go for it. the easiest way to do it I figure is get a speech recognition software to output only...
  20. donkey

    asking for a help

    there are hundreds of ideas in my head. start of with what you like or something that interests you. get an idea and tell us where to begin. what form of engineering you in? maybe something tailored to that would be good.
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