Member Since: January 14, 2009

Country: Australia

  • Can I second everyone's comments who wanted more such kits?
    I would prefer the E96 series as I don't use carbon film in any of my designs (except as spacers or mounting posts or spare wire), and the cost of the metal film 1% resistors is bugger-all different to the 5% carbons. Plus, the 1/4 watt MF resistors handle well over 1/2 watts easily - so there's more room for mistakes/experimentation!
    You'd only need to provide the same kinds of useful values (4k7, 10k, 22k, 47k, 100k, etc), I can get my own 11.2k if I want...
    I'd also love to see :
    - MKT caps (0.15" and 0.2" pin spacing) from 1n5 to 0u47
    - Small body electros
    - Solid tants (much better than electros at bypassing)
    - Larger body electros up to 2200uF
    - SS trannies in through-hole and SOT packages (BC848, etc)
    - MOSFET packs for motors, battery switchover, etc
    - Surface mount LED packs (gull wing are best for starters)
    - Maybe a pack of 10 SMD MAX232's (Jaycar flog dozens of them)
    - a "Crystal Box" (being a box full of useful crystals)
    - 1W resistors
    and so on. Go on guys, go for it!

  • I'm seconding this, guys! I bought the SUP500 based on this article, but it looks like a couple of weeks after it arrived, you decided to stop carrying it. I only found out about it today. Grrr...
    I do like the look and feature set (and reliability!) of the Locosys module, so it looks like I'll be forking out some more dough RSN.
    Ah, the difficulties with bleeding edge technology!

  • If you wire 2 batteries in series, you double the voltage but have the same current. (The LiPo pack is made of 3 cells in parallel, that's why SF notes this pack has the same voltage as one cell, but 3 times the current capacity).
    In your case, you'll get anywhere between 7.4 and 7.8V (depending on the particular battery pack and the state of charge as it came from the factory) at 6A.
    I really wouldn't recommend trying this combination! Cameras are really fussy about their batteries!
    The camera uses sophisticated voltage sensing to figure out battery life, and the higher nominal voltage of this pack will screw up the measurements totally.
    If you're lucky, the camera will just display a faulty battery symbol - until it shuts down in the middle of a crucial photo because the batteries have fully discharged and cut out. This will also shorten the life of the cells - or kill 'em totally :(
    If you're unlucky, you'll let the smoke out of your camera!

  • Hmmm... although... a small mains transformer and a 555 and mosfet, plus the conductive thread would make an excellent and incredibly effective (and possibly permanently damaging) anti-bedwetting device!
    (You can tell I don't have kids :)
    Although it might work better for pets. Hmmm... ;) Commercial opportunity there?

  • Not for bedwetters though! (And no, that's not a problem I experience... yet...)

  • I realise this is an old post, but anyways...
    Is anyone from southern Australia flying rockets? Specifically, in the Melbourne area?
    As a wannabe rocket enthusiast from 'way back, it's incredibly difficult to import motors and components. It's difficult even finding local suppliers of airframe materials! You guys in the US have no idea how lucky you are!
    I achieved ~2200 feet (670+ metres) using a handmade aluminium 3" dia tube rocket (about 22 years ago). Since it's illegal to buy black powder (or any other kind of cool chemical) in Australia without a blasting licence, I made my own black powder and hand-packed it (700grams). I used a duralumin nozzle (a mate worked for Qantas as a machinist at the time), which I found the remains of about a year later...
    I actually tried packing a kilo of handmade white gunpowder in an earlier 2-stage trial, but I ground it way too coarse and ended up dodging flying aluminium and (after the grassfire was finally put out with a backpack) filling in a 7-foot-wide crater. I loved that part of living in the bush - no-one gave a damn.
    That's what made me want to learn engineering!

  • 350 gallons per hour? For a drinking robot? Cripes, you must be so thirsty! (And surely you'd call your robot 'Bender'?)
    Let's see... if you divide by 4.55 and carry the 2... That's a bit over 22 litres per minute.
    With beer at 4.8% alc/vol, you'd need to run this for about 25 seconds to get DUI!!!

  • Oh yeah - for everyone complaining about the price : a friend of mine bought 2 x 8" diameter non-motorised metal omni wheels (admittedly with bearings for each of the rollers) about 18 months ago, and they cost him US$1370.00 - plus shipping.
    So $70-ish bucks for 4 of these is a steal!

  • I was almost drooling as I first saw these nice babies, until I learned how they're designed to work.
    Unfortunately, Rocky (my rover, at http://www.tenuousminds.com) uses a single motor, through a reduction gearbox, through dual 2-wheel drive axles. That means these won't work on the current design. Sad face...
    For anyone interested in using these wheels, be aware that you need one motor per wheel in order to use their amazing directionality!
    That's not a huge deal for most typical 2-wheel-drive 'bots, but there's no way a single-motor 4x4 chassis can be easily modified to drive 'em. Since 4 small motors are much less efficient than one large one, I'm snookered power-wise too. Oh well - looks like I need to go back to ze drawinkboard!

  • On the subject of fibre optics and flexible lighting, has anyone tried EL (electroluminescent) cable? It's available in a bunch of colours, and would be almost bright enough to see in the daylight.
    While I haven't had a chance to play with any myself, the only downside (apart from the 400 volts or so needed to light the suckers up!) is that the cables I've seen are pretty heavy - on the order of 1-2mm or so. So you'd have to be fairly creative to not make it look like Tron/Tronette...
    And 400V would sure sort out the customers with poor sewing skills... (Only kidding! Only kidding! Darwin would kill me!)
    But there's no reason you couldn't attach the wire to the backside of the fabric, or slip some clear polyethylene tubing over the wire. It'd make for some really cool gloves!

No public wish lists :(