Something to beware of; One friend's P2 system, which he used a Peltier type cooler on, became OVER cooled, so much so that he had condensation dripping onto the socket. In under 3 months time, the socket became corroded enough that the momboard & CPU quit speaking to each other. As the same store had sold him all 3 parts (CPU, cooler, and Momboard), he got a free replacement set. He wasn't happy though. Laughing here: Thought that occured to me, is that doing this on a PIC would probably freeze the PIC quite thoroughly, even if WAY overclocked! (Talk about thermal shock...) The icicles could pop the PIC out of it's socket, in a few heat/cool cycles! Dunno if SPI or I2C are needed on such a cooling unit, but a basic dumb (or PIC-based) THERMOSTAT might be a very good idea, or just use passive cooling. (A 16-pin DIL heatsink, or for really overclocking things, a 386 or 486 heatsink, silicon grease in the center, superglue in the corners, would work rather well; Tap the heatsink sharply, and the superglue will shear nicely, so it's even removeable. I use that for 486DX2/66 upgrades to DX33 laptops. I haven't tried removing such grease from /JW parts, mind you! That'd be tough... ) Mark dlions@acs.itd.uts.edu.au wrote: > > Yes, great fun if you are a hobbyist. I needed some extra speed for my > first project and was able to clock a 16C84 /04 at 16MHz. Strangely > enough, it took about 5 mins to warm up, before it would run reliably. > I thought it was the other way around (i.e. heat makes it fail). This was > the only time i ever felt a PIC get warm (apart from plugging them in > backwards!), but it only felt fractionally above room temperature. > > Someone said on this list before that they are factory tested to 2xrated. > Like Mark Willis said, it can be done, but since its out of spec nothing > is guaranteed anymore. > > My 300A only goes to 375 (with 2.4V, peltier, 80mm fan etc). Anyone want > to start an overclocking guide for PICs? How about marketing a range of > vapour-dispostion active cooling attachments with 5V supply and SPI > interface? > > On Fri, 2 Jul 1999, Aaron Martin wrote: > > > Does anyone know if you can "overclock" a PIC? (I remember in the olden > > days where we would push 386-33's to 384-40s and 486-66s to 486-83s)...and > > Even today, Celeron 300a can be pushed to 450mhz. Can we do this with the > > PICs? > > -- Aaron > >