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  1. donkey

    Rechargeable batteries input

    this depends on a few things.the most important is type of battery. SLA batteries is what I assume you will use as these are the most common 12volt batteries. then you have to lookat their ah rating. I have a 7ah 12volt SLA battery. then look at your charger I use a simple 1amp battery...
  2. donkey

    LED reduction Resistor

    ok I like these threads cos I can answer them. simply put you got it right (someone will add to this if the resistor value is wrong though) but the simple truth is you need LED resistor and power source (car battery or whatever) now the problem is that you are using a 12volt battery. this is...
  3. donkey

    Simple infrared transmitter

    there are devices that use bluetooth to stream the media on the market already. IR is very.... weird for this sort of thing. you need direct line of site, it has to have very little in its path.
  4. donkey

    peltier devices

    ok there is alot of people that say these are good alotsaying they are not. but anyway I have a grand scheme of making a very small air con. I have some of the parts required and some on order. but I will try to get to the questions soon. first of all I got me a stock standard 80watts peltier...
  5. donkey

    get it right

    hey guys this is an observation again. just something I notice from time to time. I in no way wish to do anything more than point this out. So why do people have half an idea and try pushing an illadvised/ un thought out scheme constantly? I have in the last 2 weeks found it getting slowly...
  6. donkey

    Simple infrared transmitter

    it depends on the output you want. if sending simple on/off commands then you can buy one of the netfor dirt cheap. if you want one to transmit data (which I think is no good) then you will need something more specialised.
  7. donkey

    Can anyone advise which multimeter to buy

    atm I am looking at my $5 au multimeter and it hasn't missed a beat for the nooby stuff I do. when I get my hands on the new toys I may consider upgrading. as with all itemsthat you buy consider the following what you want it to do now, and how long you want it to last. right now a simple $5...
  8. donkey

    Raspberry Pi

    also the raspberry pi has a massive following. if you ever needhelp check out their websiteand forums,
  9. donkey

    Science Project BrainTeaser Question

    we had something like that in high school that was 13 years ago. I remember the guy that got the solution but for the life of me it took ages to remember the solution... I had to pm him on facebook lmao
  10. donkey

    Science Project BrainTeaser Question

    the idea is to bridge the 2 pins on one side using the paper clip
  11. donkey

    Science Project BrainTeaser Question

    oh wait you can take the whole second battery out and just use the one but the paper clips were too hard to draw so to describe just remove the second battery and plug the wires to the same pole on the first battery
  12. donkey

    Science Project BrainTeaser Question

    rough idea. using the 2 thumbtacks space slightly apart so they aren't always connected might help it but not too far apart so the paperclip can't make a connection just an edit.... paper clips are hard to freaking make in paint lol
  13. donkey

    Science Project BrainTeaser Question

    tugalug 2 batteries would make a difference. it is about dividing the power so that you can make it work. if you want to see it with 2 batteries I could make a diagram but if it has to be 1 battery than we may need to rig a dpdt centre off switch. you could do that by NOT connecting wire to...
  14. donkey

    Laser module question

    its just a fun thingI got nothing important but I wanted to play with it
  15. donkey

    Science Project BrainTeaser Question

    the explanation is very vague. but looking at the second picture showed it there are 2 switches 1 in each room. each switch can be off, turn on only the light in that room, or both rooms. so in room 1 the switch is off, room 1 light only or room 1 and 2 together in room 2 the switch is off...
  16. donkey

    Need a simplest wirless project

    hi avidestroyer and welcome. what is this device for? how manny channels? what range? encryption? data rate? if you want a simple wireless system http://compare.ebay.com.au/like/400306633172?ltyp=AllFixedPriceItemTypes it turns stuff on and off... have fun
  17. donkey

    Science Project BrainTeaser Question

    I am failing to see the issue here without giving you the answer it is pretty straight forward the scond picture shows what the switches are suppose to do... and it is simple enough I figure.
  18. donkey

    240vac Conversion

    I agree with both above posts. first and foremost playing with main power is DANGEROUS. even experienced electricians take every precautionpossible. being in yr 12 I would highly recommend DON'T. second the fan you have bought is the exact opposite of what your teacher has specified. I can...
  19. donkey

    Magnetic fields near cellphones

    most items designed by the original manufacturer take into consideration the phone specs. for example Ipad comes with a magnetic cover. now if that cover was to in some way damage their own product then they would have to remarket it or fix the hundreds of thousands of devices they broke. read...
  20. donkey

    Help with a Cell Phone project

    just wanted to point out this is an open forum where we share ideas. ideas like these would be good if shared. we don't mock we offer opinions and by pming you only get 1 view point.
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