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  #21 (permalink)  
Old 17th February, 2005, 03:00 PM
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I'm working on an application using the 18F4550, which is USB 2 Full Speed capable. Yes, I need the USB support.
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  #22 (permalink)  
Old 17th February, 2005, 03:11 PM
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WOW lol thats a bit too high end for me. is it like part of a mass storage system or something? I always thought that PICs were very low end kind of chips, at least mine was. How much is a USB2.0 capable chip?
In the process of programming and reprogramming my PICs, i killed 2 of them. You really really have to put them in the programmer's socket the correct way round. Theres a hard way to learn this and i found it. Trick is to put a dab of white out on one end of the chip and put a dab on the socket too
my chips were $15 each for the first two and $25 for the last one. worth every cent for the power and flexibility they offer. Im thinking of what i can do with these things now, seeing i still have the programmer etc for it. Just dealing with inputs and outputs, there are so many purposes for these things.
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  #23 (permalink)  
Old 17th February, 2005, 05:38 PM
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None of the PICs are really low end devices - even the small 8 pin PICMicro devices are pretty powerful!
The USB2 spec for Full Speed is actually only 12Mbit/sec. Devices that run at High Speed get the full bandwidth for USB2. Confusing!

As for how much - they cost me less than AU$15 each, so they're pretty inexpensive. There's plenty of PICMicro devices to choose from if you don't need USB. The only problem is that the 18F4550 devices don't have a lot of support from programming devices yet. Even the PICStart Plus doesn't support 'em!

The midrange PICMicro devices can be programmed with a pretty simple programmer though, so they might be ideal for a project.
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  #24 (permalink)  
Old 18th February, 2005, 07:28 AM
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Cheers for the help! Ill see how much cash im gonna have spare and weigh up which is gonna be best
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Old 18th February, 2005, 09:30 AM
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If you get something cool running, dont forger to take pictures during and after the installation ok?
that goes for peltier and for phase change.
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  #26 (permalink)  
Old 18th February, 2005, 10:19 AM
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Smile

will do. cheers guys
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  #27 (permalink)  
Old 4th March, 2005, 01:23 PM
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I got a pelt off ebay, 300w for about £10.

I havent used it in the system yet but I did build a PSU using a guide from overclockers.com, total cost for building a PSU capable of 25-30A (the pelt is rated at 20A) was about £60

I tested the pelt with a switech MCX462 and a Phat delta fan and just a cold plate on the chilly side, I can tell you this much, that heatsink got very hot in the 10 mins it was on and defrosted the cold plate.

Glad I've got some water cooling in this new rig, I'm gonna try it with that.

I'll organise the pictures once I set it up in a week or so when I get some time to myself.
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  #28 (permalink)  
Old 4th March, 2005, 02:38 PM
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Yeah, I'm not surprised. The 300W peltier's I've seen the specification for will kick out about 700-800W worth of heat when they're run at their rated QMAX. Aircooled heatsinks just can't handle that level of power. Some water cooled systems will also struggle, so make sure you choose decent parts!

Edit: Checked out what I think you might have bought. It's rated at 26A at 15.4V, which equates to 400W of power. Add on the 320W it can pump, and you need to handle 720W of heat.
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  #29 (permalink)  
Old 4th March, 2005, 05:03 PM
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Yeah, it was supposed to be a 200w one but the guy sent the wrong one, I can vary the PSU's output as the trnasformer has 10v, 13v and 24v tappings so I might run try it at 10v.

It's just something to play around with TBH.
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  #30 (permalink)  
Old 22nd March, 2005, 08:04 PM
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Although this ax7 has held well i cant wait to get some money together for a watercooling setup, theres just too many music festivals about, sigh, one day!

Good luck with the 300w peltier, at least you know you have the headroom pelt side of things. What radiator you using to cool such a beast?
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  #31 (permalink)  
Old 22nd March, 2005, 08:14 PM
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I have the standard dual 120mm RAD that comes with the H20-220 kit, Also got a spare 130mmx1300mx20mm radiator I could mount on the rear of the case for a bit of extra cooling.

I prob wont use the pelt in the PC TBH, 2.8Ghz at 35c-45c is fine for me till A64 time.
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