>-----Original Message-----
>From: piclist-bounces@mit.edu [mailto:piclist-bounces@mit.edu] 
>Sent: 31 January 2006 17:11
>To: Microcontroller discussion list - Public.
>Subject: Re: [OT] Mechanical Strength of a Bolt
>
>

>Gotta love these one off pro bono lashups.
>Where are the 7812s. Aaagh. No 7812's. OK LM317. Which pin is adjust. 
>OK. What's the recommended output to adj resistor. 240. 240?. 240! 
>Don't they know about E12 series. Or E6. Or E1 for that matter. Hmm. 
>100's a bit low. 1ks a bit high. OK ok 270 then. Lessee - 
>(12-1.25)/1.25*270 = . Where's the calculator. A real man could do 
>that in his head. And a real engineeer... . But an unslept engineer's 
>been known to do silly things, even on something so simple. OK then. 
>Use C. No not C, C.COM. Good old DOS. 2322. 2200? 2200/270*1.25+1.25 = 
>? C. 11.43. Bit low. Not that it matters really. Just to drive a 12v 
>CCFL. Could add a series diode. nasty. Still. 2700s gotta be too high 
>though. c 2700/270 - OK - even I can do that on no sleep * 1.25 + 1.25 
>= 13.75. Yep. A bit low is better. Could use parallel resistors. Nah. 
>Not worth the hassle here.  Now. Caps. Do I REALLY have to decouple 
>the reference divider? What a pain. Noise is hardly an issue here. Is 
>it? What about protection diodes. Nah - no real energy to feed back. 
>Another 317 for 5v? But then I'd have to calculate the divider again 
>:-). OK - LM340s we have. There IS a place for LM340s after all. But 
>not a very big one. Caps? Pretty unimportant AFAIR. Better check the 
>book just in case. Boo? Yep book. 1982 National. Not even NatSemi back 
>then. Even quicker than looking on the PC. Is the 317 really that old? 
>Apparently. Where was I. Oh yes, caps. Just feeding some switches. Not 
>critical. But an oscillating switch feed would be 'interesting'. OK. 
>That's the caps sepcd. Looks like time for a coffee. Shame caffeince 
>doesn't affect me at all. Just as well :-). It's the ritual I guess. 
>Even if it's decaf. Maybe some Uncle Toby's porridge. No - a bit early 
>yet. Back to work ...

I reckon Russell is developing some kind of brain/PS2 interface so he just thinks stuff into his email client...

Mike

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