Self charging cell phone battery
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From: William Sommerwerck on 16 Apr 2010 06:33 > I suppose you don't want to hear about my gasoline engine- > powered hard disk drive? Does it meet EPA specs? >>> The original pager was Motorola H04ANC (all germanium). >> Really? Perhaps for the RF transistors, but not the rest of the device. > I'm fairly sure the H03ANC pager was all germanium xsistors. I don't > have a manual for it to check. I think (not sure) that the next > model, the Pageboy I, was all germanium, but I'll have to check the > manual. > http://en.wikipedia.org/wiki/Motorola_Pageboy > I know the associated walkie talkie, the HT200, was all germanium, > because I worked on enough of them. I should also have a manual for > the HT200. I could be wrong, but my memory is that germanium transistors were "dead and gone" by the early 70s. Certainly they'd disappeared in audio equipment. Germanium devices had higher carrier mobility, so at that time (I believe) they offered better performance at VHF and higher frequencies. (This pager was UHF.) Is there really such a thing as a rechargeable mercury battery? > I still have one or two tube type walkie talkies from that era. > Pencil tubes are fun. > http://home.netcom.com/~wa2ise/radios/penciltubes.html One of my uncles had an earphone-only "very-large-pocket" radio that used two of these.
From: Jeff Liebermann on 16 Apr 2010 11:16 On Fri, 16 Apr 2010 03:33:52 -0700, "William Sommerwerck" <grizzledgeezer(a)comcast.net> wrote: >> I suppose you don't want to hear about my gasoline engine- >> powered hard disk drive? > >Does it meet EPA specs? Nope. It was a Seagate ST225 20MB disk drive. (That's megabyte, not gigabyte). It had a large flywheel spinning at the bottom. I attached a rubber pully and model airplane engine to the drive. The problem was that the laptops of the day had trouble making it through a typical airplane flight. This would extend the operating time of the laptop. Smoke and noise was not considered a problem on commercial airplane flights at the time as this was before smoking was banned on commercial flights. >>>> The original pager was Motorola H04ANC (all germanium). > >>> Really? Perhaps for the RF transistors, but not the rest of the device. > >> I'm fairly sure the H03ANC pager was all germanium xsistors. I need to dig through a few file cabinet drawers to find the manuals. Give me a day or so. I'm fairly sure these were all germanium. >I could be wrong, but my memory is that germanium transistors were "dead and >gone" by the early 70s. Certainly they'd disappeared in audio equipment. I'm not sure. There were plenty of logic devices using 2N404 xsistors well into the late 1970's. Also germanium audio output and power supply switchers used in 2way radios. While everything I designed in the 1970's used silicon, many of the radios I worked on during the late 1960's and early 1970's were a conglomeration of tubes, germanium, and silicon. For example, the Motorola Motrac series had one model with a silicon receiver, germanium audio and HV PS switcher, and tubes in the driver and RF power output stage. >Germanium devices had higher carrier mobility, so at that time (I believe) >they offered better performance at VHF and higher frequencies. (This pager >was UHF.) The big advantage of germanium for portable equipment was that it would operate at a lower voltage than silicon. For switching power supplies (i.e. free running multivibrator with no regulation or protection), the lower saturation voltage of germanium meant less loss and less heating. >Is there really such a thing as a rechargeable mercury battery? Nope. I think the author got confused as the Pageboy I would take either battery, but only the NiCad version was rechargeable. More later. -- Jeff Liebermann jeffl(a)cruzio.com 150 Felker St #D http://www.LearnByDestroying.com Santa Cruz CA 95060 http://802.11junk.com Skype: JeffLiebermann AE6KS 831-336-2558
From: William Sommerwerck on 16 Apr 2010 13:57 > The big advantage of germanium for portable equipment > was that it would operate at a lower voltage than silicon. > For switching power supplies (i.e. free running multivibrator > with no regulation or protection), the lower saturation voltage > of germanium meant less loss and less heating. Didn't some of those pagers run on a single AA cell? You're right -- even with a switching supply, that would have been difficult with silicon devices. At least, if you wanted to get reasonable battery life.
From: jeff_wisnia on 16 Apr 2010 17:51 sparky wrote: > On Apr 14, 2:09 pm, "William Sommerwerck" <grizzledgee...(a)comcast.net> > wrote: > >>This general idea is hardly new. There have been patents for gadgets you >>attach to your leg, and body movements generate electricity to charge a >>battery. >> >>The problem with this patent is that it uses a piezo device. Unfortunately, >>they don't generate very much energy. You'd certainly be able to "top off" >>the battery, but I don't think you'd be able to bring it back from a heavy >>discharge very quickly. Maybe the former is all they care about. > > > > > Quite similar to the self winding mechanical wrist watches. > > > Certainly nothing new ! Seiko makes "Kinetic" quartz watches now: http://www.japanese-watches.com/seiko_kinetic.htm I wonder if the "tiny technological marvel" mentioned as the energy storage device is a supercap or a rechargable battery? Jeff -- Jeffry Wisnia (W1BSV + Brass Rat '57 EE) The speed of light is 1.8*10e12 furlongs per fortnight.
From: Michael A. Terrell on 16 Apr 2010 20:08
Jeff Liebermann wrote: > > I suppose you don't want to hear about my gasoline engine powered hard > disk drive? Only if it was fully blown, and could back up a floppy in under two nanoseconds. :) -- Lead free solder is Belgium's version of 'Hold my beer and watch this!' |