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  1. donkey

    Adjustable speed motor

    if its for a clock then the simplest idea is to get a normal motor and gear down the speed, in most cases this increases torque as well. power requirements is still not added here
  2. donkey

    Double grounds and Double positives

    just to add to coca cola there are times when a design is way to big too connect all the positives together so you can find a few places that have grnd or pos listed. if the voltages are the same and it does not refer to one being digital or analogue you can infer these can be hooked up to the...
  3. donkey

    Adjustable speed motor

    all motors can be adjusted in speed. using pwm. if you give us power requirements then we could possibly show you a circuit. oh and welcome to the forums
  4. donkey

    battery sizes

    saw this link and thought I would share it for the hobbyists out there http://en.wikipedia.org/wiki/List_of_battery_sizes hopefully it will help you find out the common name for batteries when you try ordering them
  5. donkey

    Repairing a battery contact

    ok is it sr44 batteries it uses? and if so you can buy holders for them. the soldering is up to you
  6. donkey

    wireless microphone problem

    you could also buy a very simple phone make a device that attaches to it then have that bluetooth or wifi to your other phone. wifi will get you heaps of room to transmit data and sound plus a few movies lol. the added bonus of this is you could get a higher end phone like an iphone 4g and use...
  7. donkey

    frequency

    the reason i set it to emergency is the device will trigger if someone tries turning it off as well either by destruction or by other means. and emergency is security
  8. donkey

    frequency

    its not eaves droppers or meddlers that concern me. what conerns me is the way I have it planned is a stream of data every, say, 30 seconds, until the device is "activated" then it switches to a constant stream at a different frequency or packet of data. the fail safes will include low battery...
  9. donkey

    frequency

    I knew there are limitations, and I am NOT doing anything right now, but my project will require little intererence to work properly. size is an issue too as well as power consumption, the idea is nearly ready but I wanted to know in advance roughly how much room I would need if I were to go...
  10. donkey

    frequency

    ok this is of the original topic, but seriously optus has just been no good to me. last year after 4 months of telling them i was losing data and them telling me speed was fine and me hitting my head trying to tell them the difference between data loss and speed we found out the local hub was...
  11. donkey

    frequency

    mongrel, first of all hi am in briz. second i saw those transmitter reciever packs but i think its over kill, and when I have an operational product working will show you all the idea as well as try an figure out the next few steps. and davenn just my luck, yet another optus worker that...
  12. donkey

    wireless microphone problem

    blue tooth is a great idea for this project then as bluetooth transmits data. there is very little existing, if anything, that transmits data over FM a quick review seems the limit of bluetooth v1.2 was a speed of 721kbps. that is a hell of alot faster than i realised and should stream nicely...
  13. donkey

    frequency

    the big issue i have is the project in mind needs to be "secure" I just need as little interference as possible and the only transmitter/reciever or transcievers I find use these frequencies. I also heard from the local tele guy (optus here in australia) the new 4G rollout will be on the 433mhz...
  14. donkey

    Plz help me

    as everyone else has posted, more details are needed. I am assuming you got a sealed lead acid battery, if that is the case you NEED to keep it as close to fully charged at all times as possible as sulphication may start. to check if battery is working get an automotive probe ( it looks like...
  15. donkey

    frequency

    ok so far I understand that these frequencies are standard because they are open to public. but hyperthetically I was wanting to have a 3ghz transmitter reciever, besides getting the rights to this frequency would I need a specialised chipset or could I somehow manipulate a 5.8ghz set to...
  16. donkey

    frequency

    I am seeing ALOT of transmitters using 433mhz 2.4ghz and 5.8 ghz. I also see alot of existing products using these same frequencies. is there a reason why these specific frequencies are used? I have yet to hear of, for example, a 3.295ghz transmitter and reciever. Is this because it has been...
  17. donkey

    wireless microphone problem

    you can find other recording equipment if you look for it, but seriously the FM band has the great bonus of not being OVER used. wi fi works on 2.4ghz or 5.8ghz and alot of devices are now using these bands so interference is an issue, being a medical device I am guessing that is something you...
  18. donkey

    arduino

    not a lot. been looking at it and will be grabbing the experimenters kit soon. if all works out well will get back to you. how is cairns my old friend?
  19. donkey

    PC lighting

    http://www.superdroidrobots.com/images/TE-044-000.jpg something like one of them? typically used on the door of washing machines and dryers. give us a country and we could possibly give you a supplier
  20. donkey

    Dead LED's

    there is an easy way to test the power supply, if it works then assume at least one led is blown. the only way i can think of to test the leds is grab a battery pack, resistor, and test each one individually.
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