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Recent content by chopsuwe

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    Imaging HDD with Acronis...what did I do wrong? Should I go Ghost?

    The new Vista/Win7 boot loader gives this error when there is something wrong with it. If you have an older copy of Acronis it will not be aware of the new boot manager and will not get it right on the restore. Windows gets confused if there is more than one boot manager present. If you...
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    Airtight case

    Thanks for the link to the NEMA cases I thought there must be something like that available. I think we will have another look at the conformal coating and dielectric grease idea for the time being. A toughbook could be an option but 6x teh price. The whole city is built in a geothermal...
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    USB controlled servos

    Parallax micros are pretty common so I'd be surprised if someone hasn't already written a driver for Linux for it. At a guess servos for a radio controlled car would work fine.
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    Airtight case

    We have a client in a city with a large amount of geothermal activity. The workstations we have installed are only lasting 4 months before all the hydrogen sulphide in the atmosphere corrodes any exposed copper on the boards. The charcoal filters in the building's air conditioning can only so so...
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    Lighthead conversion

    I've done a similar job adding a camera to a theodolite for a directional drilling rig. Two strings of three leds will provide enough light. The more leds you can fit in the better, of course, because cameras like light. The original halogens will be around 20 watts.
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    Genmay preview

    Not to mention that the rest of us who live outside the US don't know what Memorial Day is let alone when it is. I swear you need to be psychic or just plain lucky to hit one of these days, especially for those of us who don't come here every day. :( So when is the next one? :confused:
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    nyquist theorm and sampling ?

    Because when the DA plays join the dots to recreate the original signal it uses straight lines. Straight lines are made from harmonics (multiples of the original frequency). Filtering gets rid of the higer frequencies and leaves you with smooth curves. Moving to a higher sampling rate doesn't...
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    Is electronics a hobby?

    Shhh don't give him any ideas or the whole lot'll stuck in the paid section. I hope it doesn't get moved because by the time I've mpaid all the fees to get the money to the states it's around $40! Meh it's probably better I got out anyway.
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    Genmay preview

    Is Genmay ever going to be opened up for viewing so we can see if it is worth joining? I know the fee $5 isn't much in the States but when you have to add in currency conversion and international transfer fees just to get the money into Paypal it comes to almost $40! That's about 3 hours pay...
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    15 mins battery charger

    There are some side effects of fast chaging. It is very easy to over charge them. An exta 15 mins on a 14 hour charge isn't much, but in a 15 min charge it is doubling it. Most of the superfast chargers have a built in cut off so it won't be a problem. Some cheaper batteries don't like being...
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    How hard would it be to make a circuit that decreases resistance by temperature?

    There is an easier circuit using one transistor and a few other bits. Have a look at the first circuit in this thread http://hardforum.com/showthread.php?t=1025895 Remove the led and R2 and put your fan in there instead. Make R1 about 1.5k ohm. Use a good size transistor rated at about 25W...
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    How do you shape plexiglass...acrylic...Lexan...???

    The best method I have come across for doing straight bends it to place the plexi on top of two boards of about 1/4 - 1/2" thick. Leave a gap between the boards about 1/2" wide. heat the plexi form underneath. This results in a fairly narrow strip of soft plexi so it has no choice but to bend...
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    Newbie-ish question - How do I find the h21E?

    That is supposed to be hFE. With a gain that low you should be able to throw just about any transistor in there. I would suggest a BC548 or 2N3904 as they are cheap and as common as dirt. What is the circuit for anyway?
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    Converting Cold Cathodes to USB?

    It is possible. You need to watch the current draw as USB is limited to 500mA. Either get a 5V inverter or modify a 12V one. To mod you need to remove half the turns on the primary (normally three turns of thick wire on the outside of the transformer) This turns it into a 6V transformer...
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    soldering....

    Get 60 tin / 40 lead fluxed electronics solder.
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