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  1. donkey

    Help on leds

    they are brands, and are used for mag lites etc. ok we know 5mm what colour? and how many?
  2. donkey

    There goes the neighborhood

    yeah hand crank items have a bad rep, but they come in useful if you get one with the right battery backup and gear ratio. the one that has interested me is so hard to find but was seen on tv a few years ago. you and a wind up spring like in clocks, as it unwound over several hours it produced...
  3. donkey

    Wireless Remote

    ok a few things here, define range. define the current setup, define what you want the remote to do. If you have a setup that can take an input but is not "remote" then a simple circuit instead of a keyboard could act as a reciever allowing you to create keyboard. if the range is 100metres...
  4. donkey

    Boot iPhone 4 without battery

    or a powered USB hub
  5. donkey

    Wi-Fi instead of NFC

    ok from my experience with smartphones I am telling you now I will never ever ever ever put my credit card details on something that can be easily stolen. also if someone else gets my phone they could clone it and then multiple users could use multiple phones but only one person will be charged...
  6. donkey

    Readily Available Energy

    lol at raven. its a great concept I say. anyway as for cc's comment is the home owner can put said item into their house to create heat. the only issue I had was turning the dang thing off, and protecting the glass. its a great concept but as with all things it needs a few people smarter than...
  7. donkey

    Help on leds

    and last but not least series or parrallel is another issue again, how many are you driving? if its less than 4 either won't matter. but if its more than 4 than you need strings for best effect. right now all we got is 5 super bright LED's from a 9volt battery. in that case try the CREE range...
  8. donkey

    Readily Available Energy

    there are so many different ways to make nergy, but the weirdest part is we still burn things to make heat which is used to turn a turbine to create electricity... to create heat....... that still perplexes me. I have a good friend (who thinks himself a mad scientist... i don't think he is a...
  9. donkey

    There goes the neighborhood

    on the other side if you want to save money on batteries I have seen hand crank items http://www.jaycar.com.au/productView.asp?ID=ST3352 this one I like cos its at 5v, has radio and flashlight too. carrying one item to replace a few and no extra batteries. ticks a few boxes for my survival...
  10. donkey

    Help on leds

    typically when buying LED's you have to look for a few things, brightness is one sie is another colour, or bicolour or tricolour and do you want flashing? if you mix a few LED's together you could simulate flames like they do in the electronic candles.
  11. donkey

    There goes the neighborhood

    hi and welcome. I am curious as to what you will build here. I am a north qld boy (australia) and get really shocked to see how many people don't have back up plans for things like storms. If you want help or just a few bad ideas that I have come up with over the last few years for disaster...
  12. donkey

    Anti shoplifting equipment

    being a security officer I can tell you straight of its a few factors to take into consideration. first of all is the cost.... do you really want to spend $1000 to protect a pack of gum? second of all time, if you do put something on the said gum will the time it takes actually be worth it...
  13. donkey

    AM Radio Interference

    the fact that its AM might make my answer a little less likely. but is there a DJ or jukebox that is not wired to the house speakers? they could be using a transmitter for this. even a wireless microphone.
  14. donkey

    Battry Backup Time

    if its straight ah and amps then life of battery =ah/a but you should at most use half that number and allow a further 10% for innefficiencies for watts amps = watts divide voltage then calculate as above. once again do not drain below 50% and add 10% for inefficiencies
  15. donkey

    Battry Backup Time

    in that case it would be 7 BUT no device I know of has an AH rating, they either have amps or watts. so finding an AH rating on a battery is common on a device its not. I am noobish and I always assume that amps rating is amps used in an hour but I may be corrected there. as for the...
  16. donkey

    Ethernet camera less wires = want

    could you not use a standard camera for surveillance with an rca jack, this would only use 2 wires for signal. then you could use battery inside the bot
  17. donkey

    I want to make a FM radio transmitter, help me

    richard as a favour to me can you tell me how the wholse setup works? we had another post ages ago in relation to this and I am very interested. also thanks for the name change
  18. donkey

    I want to make a FM radio transmitter, help me

    the big issue is that even if we give you a very specific schematic to follow, a wrong resistor or cap could possibly turn your little device into something similiar to a radio frequency jammer/blanket. anything that involves long distance tansmissions is usually best left to professionals...
  19. donkey

    Ethernet camera less wires = want

    why not use the network cable (cat 5 or cat 6) to send just the data. inside the robot use a microcontroller to recieve said line and send signals to the items. having said that you would need a powerful micro OR something like a raspberry pi for the video feed, as I haven't seen that many good...
  20. donkey

    Ethernet camera less wires = want

    why would you want to do that? are you adding more cameras using one chord? what you are trying is possible, but a network switch might be cheaper just let us know the full story before you go hacking into chords or even worse into the camera
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