On Mon, Feb 14, 2011 at 4:59 PM, Rich Mellor <r...@rwapservices.co.uk>wrote:
> On 14/02/2011 22:53, Plastic wrote: > >> On Mon, Feb 14, 2011 at 3:51 PM, Phil Kett<pk...@genesis-midi.com> >> wrote: >> >> >>> On 14/02/2011 21:23, Tony Firshman wrote: >>> >>> Plastic wrote, on 14/Feb/11 20:50 | Feb14: >>>> >>>> On Mon, Feb 14, 2011 at 2:09 PM, Tony Firshman<t...@firshman.co.uk> >>>>> wrote: >>>>> >>>>> >>>>> On 14 Feb 2011, at 20:01, Plastic<plasticu...@gmail.com> wrote: >>>>>> <snip> >>>>>> >>>>>> Is the CR2032 man enough though? >>>>>>>>>> >>>>>>>>>> >>>>>>>>>> The CR2032 is 3V 235ma, and on this card would need to be >>>>>>>>> replaced >>>>>>>>> >>>>>>>>> every >>>>>>>> >>>>>>> three years or so, which would be a simple "pop a new one in" >>>>>>> >>>>>>>> operation... >>>>>>>> >>>>>>> The 40LF220 had a lower current capacity but was designed for a long >>>>>>> >>>>>>>> shelf >>>>>>>>> life of ten years, hence the bulk. So yes, the CR2032 truly fits >>>>>>>>> this >>>>>>>>> application. >>>>>>>>> >>>>>>>>> The format is standard for battery backed clocks on PCs, but was >>>>>>>>> quite >>>>>>>>> >>>>>>>>> new >>>>>>>> >>>>>>> in the late 80s. >>>>>>> >>>>>>>> I will look at current costs for getting a batch of 100 of these >>>>>>>>> tiny, >>>>>>>>> single layer PCBs made. >>>>>>>>> >>>>>>>>> Couldn't the card have a battery socket so that only the battery >>>>>>>>> need >>>>>>>>> >>>>>>>>> be >>>>>>>> >>>>>>> replaced? >>>>>>> >>>>>>>> ( ... and why are you not yet living Texas time - it is 2am (8-)# >>>>>>>> ) >>>>>>>> >>>>>>>> >>>>>>> That is exactly what I was describing ;) A simple adaptor card to a >>>>>>> >>>>>>> CR2032 >>>>>> >>>>>> socket, and a CR2032 battery. >>>>>>> >>>>>>> Ah sorry. >>>>>> 3 years though seems a mite short. I wonder if there is a more beefier >>>>>> battery that is thin enough - or maybe a chargeable one? >>>>>> >>>>>> >>>>>> There is, but it has 50% higher capacity and costs $12 instead of >>>>> $0.99 >>>>> at >>>>> the supermarket. I said three years as a minimum. It's quite possible >>>>> that >>>>> it would last 5-6-7 years - I'm just being very conservative. Also, the >>>>> CR2032socket in bulk is under $1, but the socket for the CR2045 is >>>>> $7.80 >>>>> in >>>>> bulk. >>>>> >>>>> I think people will happily pay $15-20 for a 3-5 year battery change at >>>>> 99p >>>>> than pay $25-$30 for an extra couple of years. Also, changing the >>>>> CR2032 >>>>> batteries is so easy... 15 seconds, including removing and re-inserting >>>>> the >>>>> card. >>>>> >>>>> Yes - in that case the 2032 makes sense. >>>>> >>>> It is a pity the PC has stadardised now on the low capacity >>>> non-rechargeable. In the old days they used a Minerva like NiCad pack >>>> that >>>> lasted for yonks. >>>> >>>> >>>> These NiCad packs are not good in old computers - I've seen far too >>> many >>> amigas destroyed by acid from leaky rechargeables! >>> >>> GC and SGC are scarce enough these days as it is - imagine how bad it >>> would >>> be if they'd had a rechargeable battery on them.... >>> >> >> Okay, I have looked at the parts, PCB design and got a couple of quotes >> for >> PCB manufacture. As a rough guide, it looks like the retail price from a >> trader would be around $20 (€14.83, £12.50) to $25 (€18.54, £15.60) if I >> made 100. >> >> Lead free, gold contacts, includes quality CR2032 battery. Requires >> soldering four pins to install (or ship your card off for a nominal fee if >> you're not confident to do this). You may need to change the battery out >> once every 5 years or so. You can buy CR2032 batteries at your local >> supermarket. >> >> What is the interest in this part? >> >> Dave >> _______________________________________________ >> QL-Users Mailing List >> http://www.q-v-d.demon.co.uk/smsqe.htm >> >> >> There is probably enough QL user interest for 30-50 batteries that I know > of. Could the pins not be ready soldered, so that it is just a direct plug > in replacement ? I didn't notice it was socketed and thought it was soldered to the board and those were spacers *laughs* I will have to locate some pins or leads that fit the socket, but yes, Rich is correct: no soldering required. I am prepared to commit to making a batch of 100 if I see any other signs of interest in addition to Rich's observation... Dave _______________________________________________ QL-Users Mailing List http://www.q-v-d.demon.co.uk/smsqe.htm
