NimH AAA to 5V, suggestions?
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From: Michael A. Terrell on 11 Aug 2010 22:59 "krw(a)att.bizzzzzzzzzzzz" wrote: > > On Sun, 08 Aug 2010 21:32:23 GMT, Jan Panteltje <pNaonStpealmtje(a)yahoo.com> > wrote: > > >On a sunny day (Sun, 8 Aug 2010 14:13:41 -0700 (PDT)) it happened > >dagmargoodboat(a)yahoo.com wrote in > ><c584879b-1976-4d86-ada7-e4cdb40f354d(a)f6g2000yqa.googlegroups.com>: > > > >>On Aug 8, 1:18 pm, Jan Panteltje <pNaonStpealm...(a)yahoo.com> wrote: > >>> dagmargoodb...(a)yahoo.com wrote in > >> > >> > >>> >Wondering what other designers do, I started picking up AA cells > >>> >people toss on the road. They're usually 1.3v, only 20% used for an > >>> >alkaline cell.(*) That's a sin. If we're going to condone toss-awa= > >>ys > >>> >we ought to at least use them fully, don't you agree? Keeps them off > >>> >the road, out of the waste stream, and the user enjoys the longer run > >>> >time too. Win-win. > >>> > >?? Do not alkaline sort of go back up after you remove the load? > ??? Zi effect? > ??? May read 1.3 but could well read 1 V in a camera for example with a lot o= > ??f current charging the flash > ??? capacitor. > ?? > ??Roadside batteries come mostly from joggers and MP3 addicts. > ??Apparently joggers run on AA cells. > ? > ?They wont get far that way :-) > > They keep going, and going, and going... You're confusing joggers, with dimbulb. :(
From: krw on 12 Aug 2010 00:10 On Wed, 11 Aug 2010 22:59:30 -0400, "Michael A. Terrell" <mike.terrell(a)earthlink.net> wrote: > >"krw(a)att.bizzzzzzzzzzzz" wrote: >> >> On Sun, 08 Aug 2010 21:32:23 GMT, Jan Panteltje <pNaonStpealmtje(a)yahoo.com> >> wrote: >> >> >On a sunny day (Sun, 8 Aug 2010 14:13:41 -0700 (PDT)) it happened >> >dagmargoodboat(a)yahoo.com wrote in >> ><c584879b-1976-4d86-ada7-e4cdb40f354d(a)f6g2000yqa.googlegroups.com>: >> > >> >>On Aug 8, 1:18 pm, Jan Panteltje <pNaonStpealm...(a)yahoo.com> wrote: >> >>> dagmargoodb...(a)yahoo.com wrote in >> >> >> >> >> >>> >Wondering what other designers do, I started picking up AA cells >> >>> >people toss on the road. They're usually 1.3v, only 20% used for an >> >>> >alkaline cell.(*) That's a sin. If we're going to condone toss-awa= >> >>ys >> >>> >we ought to at least use them fully, don't you agree? Keeps them off >> >>> >the road, out of the waste stream, and the user enjoys the longer run >> >>> >time too. Win-win. >> >>> >> >?? Do not alkaline sort of go back up after you remove the load? >> ??? Zi effect? >> ??? May read 1.3 but could well read 1 V in a camera for example with a lot o= >> ??f current charging the flash >> ??? capacitor. >> ?? >> ??Roadside batteries come mostly from joggers and MP3 addicts. >> ??Apparently joggers run on AA cells. >> ? >> ?They wont get far that way :-) >> >> They keep going, and going, and going... > > > You're confusing joggers, with dimbulb. :( You couldn't get any light out of DimBulb with all the EverReadys on the planet.
From: Michael A. Terrell on 12 Aug 2010 03:15 "krw(a)att.bizzzzzzzzzzzz" wrote: > > On Wed, 11 Aug 2010 22:59:30 -0400, "Michael A. Terrell" > <mike.terrell(a)earthlink.net> wrote: > > > > >"krw(a)att.bizzzzzzzzzzzz" wrote: > >> > >> On Sun, 08 Aug 2010 21:32:23 GMT, Jan Panteltje <pNaonStpealmtje(a)yahoo.com> > >> wrote: > >> > >> >On a sunny day (Sun, 8 Aug 2010 14:13:41 -0700 (PDT)) it happened > >> >dagmargoodboat(a)yahoo.com wrote in > >> ><c584879b-1976-4d86-ada7-e4cdb40f354d(a)f6g2000yqa.googlegroups.com>: > >> > > >> >>On Aug 8, 1:18 pm, Jan Panteltje <pNaonStpealm...(a)yahoo.com> wrote: > >> >>> dagmargoodb...(a)yahoo.com wrote in > >> >> > >> >> > >> >>> >Wondering what other designers do, I started picking up AA cells > >> >>> >people toss on the road. They're usually 1.3v, only 20% used for an > >> >>> >alkaline cell.(*) That's a sin. If we're going to condone toss-awa= > >> >>ys > >> >>> >we ought to at least use them fully, don't you agree? Keeps them off > >> >>> >the road, out of the waste stream, and the user enjoys the longer run > >> >>> >time too. Win-win. > >> >>> > >> >?? Do not alkaline sort of go back up after you remove the load? > >> ??? Zi effect? > >> ??? May read 1.3 but could well read 1 V in a camera for example with a lot o= > >> ??f current charging the flash > >> ??? capacitor. > >> ?? > >> ??Roadside batteries come mostly from joggers and MP3 addicts. > >> ??Apparently joggers run on AA cells. > >> ? > >> ?They wont get far that way :-) > >> > >> They keep going, and going, and going... > > > > > > You're confusing joggers, with dimbulb. :( > > You couldn't get any light out of DimBulb with all the EverReadys on the > planet. He runs on NeverReadys.
From: mike on 12 Aug 2010 03:50 Jan Panteltje wrote: > I was looking for some 9V rechargeable blocks to power my sign_led display, > http://panteltje.com/panteltje/pic/sign_pic/ > to make it portable (put it in the car side window for example). > Those are expensive, I had one but cannot find it. > So I decided to build a small converter 1.2 to 5 V DC, > singe AA cell about 2.2Ah should give about 10 hours.. > ______________|\|_________ +5 > | |/| | > ---------------------------|-- Schottky | > | | | 5.6_______ || ( | 5t | > | | [ ] | 2t )|| (___| | > | | |--- ---- || ( 2t __ __ | > | | | | || | | | | | | > 1.2 V - === | | | --- ----- === > AA --- --- | | c NPN Si --- > NiMH | |22u | ------ b |150u > | | | e BC547 | > | | === | | > | | --- | | > | | |1u | | > ------------------------------------------------------- > Orignal Hand drawn ASCII > That works OK, does not get hot, but maybe it can be done better. > Input current is about 220mA, output about 30mA > Waveform at the collector is a nice assymetrical square wave, but it is a bit a 'soft' > output, loading it lowers the voltage a lot, high Zi. > Also for the ferrite core I grabbed some old small filter core. > no idea what stuff it is made of. > I do use the battery voltage in series to improve efficiency, > > I know there are little chips for 1.2 to 5V or 3.3V, > what is a good jellybean one? > Preferably one I can see with the naked eye and can buy in Europe :-) > I set off on a similar quest to power a PIC project in a "remote" location. While rummaging through the discount junk toys at Grocery Outlet, I stumbled across a $5 ipod charger. It's a double size usb stick with a 750mah lithium battery that charges from usb and puts out 5V regulated up to 750ma. Got a battery level button/light. Now, I don't have to build a charger or a regulator or, the most difficult part, a box to put it in...no nothing. Plug and play. Certainly not worth the original list price, but if you can find one on closeout, they're easier than most anything you can do. Doesn't have a switch, but if you don't load it, it stays charged for weeks.
From: David Eather on 12 Aug 2010 05:07
On 12/08/2010 5:50 PM, mike wrote: > Jan Panteltje wrote: >> I was looking for some 9V rechargeable blocks to power my sign_led >> display, >> http://panteltje.com/panteltje/pic/sign_pic/ >> to make it portable (put it in the car side window for example). >> Those are expensive, I had one but cannot find it. >> So I decided to build a small converter 1.2 to 5 V DC, >> singe AA cell about 2.2Ah should give about 10 hours.. >> ______________|\|_________ +5 | |/| | >> ---------------------------|-- Schottky | >> | | | 5.6_______ || ( | 5t | >> | | [ ] | 2t )|| (___| | >> | | |--- ---- || ( 2t __ __ | >> | | | | || | | | | | | >> 1.2 V - === | | | --- ----- === >> AA --- --- | | c NPN Si --- >> NiMH | |22u | ------ b |150u >> | | | e BC547 | >> | | === | | >> | | --- | | | | |1u | | >> ------------------------------------------------------- >> Orignal Hand drawn ASCII That works OK, does not get hot, but maybe it >> can be done better. >> Input current is about 220mA, output about 30mA >> Waveform at the collector is a nice assymetrical square wave, but it >> is a bit a 'soft' >> output, loading it lowers the voltage a lot, high Zi. >> Also for the ferrite core I grabbed some old small filter core. >> no idea what stuff it is made of. >> I do use the battery voltage in series to improve efficiency, >> >> I know there are little chips for 1.2 to 5V or 3.3V, >> what is a good jellybean one? >> Preferably one I can see with the naked eye and can buy in Europe :-) >> > > I set off on a similar quest to power a PIC project in a "remote" > location. > While rummaging through the discount junk toys at Grocery Outlet, > I stumbled across a $5 ipod charger. It's a double size usb stick > with a 750mah lithium battery that charges from usb and puts out 5V > regulated up to 750ma. Got a battery level button/light. > Now, I don't have to build a charger or a regulator or, the most > difficult part, > a box to put it in...no nothing. > Plug and play. > Certainly not worth the original list price, but if you can find > one on closeout, they're easier than most anything you can do. > Doesn't have a switch, but if you don't load it, it stays charged for > weeks. Something like this http://www.dealextreme.com/details.dx/sku.17836 or this http://www.dealextreme.com/details.dx/sku.40211 or http://www.dealextreme.com/details.dx/sku.30011 |