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I have seen something similar on Tech TV. They used it to power PDA's and other handhelds. The charger looked like a mouse-pad but a few inches bigger.

They actually make latching push buttons to do just that. Push it once the switch closes push again and it opens.

Does anyone know of a website where I could find specs on computer components? And Retail Prices?<p>Imput(Keyboards,Mouse, Joysticks) Output(Monitor, Printer, Speakers) Processing(Petium3&4 vs AMD) Storage(Hard drives, Zip's, Floppy)<p>Thanks, James<p>[ November 05, 2002: Message edited by: unkn...

OK the board im doing is basicly 2 12v relays controlling a 120v a fan and xformer in sequence. The terminals for the relay socket are not round like component leads the're more like a spade terminal so what would be better having a big pad and 2 smaller holes side by side so that the terminl will f...

Right now I don't have a dremel. I've got a clarke metalworking drill press and it's less than a year old. If that doesn't work i could just use the college's equipment.<p>What really annoys me is that in the fabrication class i'm in they have done away with teaching how to etch your own board. Oh b...

Well actually i've got a drill press so breaking bits shouldn't be a problem but it only goes up to 3100rpm. What size "number bit" is used for standard lead size thru-hole compnents? If I cant find someone who'll sell me just a few bits localy i'll end up buying those from harborfreight. ...

Where can i find some brill bits that are the right size for drilling out PCBs. The smallest I could find was 1/16in. I thought of using dremel bits but there all some type of tile cutter or goofy router thing. No regular drill bits.<p>The best I could find was some reconditioned bits from a surplus...

Isn't that something like persistance of vision? The rate at which a series of frames appears to be one moving picture? I want to say it's something like 24 frames per second.

Thanks for the help guys, It turned out that the formula and answer i posted was right. This was just a small problem he told us to look at. Only a few people out of the class even bothered to do the problem besides me.

Thanks for the help, i figured it out.<p>(Feedback ) (-------- ) +1 = ( Imput ) <p>(9900 ) (---- ) +1 = (100 )<p>(99)+1 = <p>Gain of 100 What unit is gain measured in? I heard it was unitless. But can't it be measured in dB (decibles)?<p>[ September 25, 2002: Message edited by: unknown_entity ]</p>

For my electronics class we are supposed to design an amplifier with a gain of 100 using a single op-amp. It has to be non inverting and the output voltage must not drop below ground.In other words a positive output. I kind of have an idea of how it works. Like how varying the feed back changes the ...

<blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr>Originally posted by ravetildon: I don't need any of the things that turn off my power form going back to the grid in case the power goes off.<p> <hr></blockquote><p>Oh yeah sure you might not need ...

if it is in a little metal can it's probably a crystal. And you can get them from any decent retailer try digi-key.

What about power factor? Nobody mentioned that yet, well sort of. <p>*In a pure capacitive circuit current leads voltage by 90deg.<p>*In a pure inductive circuit current lags voltage by 90deg.<p>*In a pure resistive circuit current and voltage are in phase.<p> That's why on large inductive loads you...

inductors store voltage in a magnetic field and as soon as the applied voltage is removed that field collapses rapidly creating a high voltage spike between the two ends of the coil.<p>Caps are kind of like a battery in that the voltage will remain there after power is removed And they can be charge...