Most switching PSU designs run at good efficiencies for currents above several 10's of mA. Using a switching PSU design for a low current consumption application is surprisingly power inefficient. Additionally, the current consumption of the DCA55 is below 5mA most of the time while switched on. in terms of size, the 12v battery is 50% the volume of an AAA cell. It does have the very notable feature of being very small and much more cost effective than coin cells for the user.
In terms of design choices, it is horses for courses really. I've even seen them in my local stationers (WH Smith in the UK). I suspect that the big electronic distributors will supply them for many years to come. I agree entirely that it isn't the easiest battery to find, but there are many manufacturers out there that make it (see attached). The MN21 style battery does indeed have a long heritage and is still fairly popular in remote key-fobs, wireless doorbells, wireless alarm nodes, some photographic gadgets as well as some bits and bobs (such as some of our analysers). Don't hesitate to prod me if there is anything I can help with.
They're available from us directly too if you're stuck. Yes, I agree, the 12V battery is fairly unusual (compared to AA and AAA for example), but are still fairly easy to get hold of from auto shops or electronics shops. PA4TIM also mentioned the odd battery type. Drop me a line if you think you've got the old type (new variety is picture attached). We changed the test leads and test clips about 3 years ago to a much sturdier set that is still universal enough for most parts but much stronger that the old type. On that subject, PA4TIM mentioned a few points that I may be able to help with. You probably already know that Peak Electronic Design Ltd is a fairly small company in the UK, but that doesn't mean we don't try really hard to make things as good as possible Being little, we can be flexible and even make changes based on customer feedback fairly quickly, so if anyone has any suggestions, complaints (be gentle!) or anything else to say then I'd be delighted to hear. please point me in the right direction if anyone thinks I should be aware of something! Anyway, pleasure meeting you all on here and I hope I can make the odd useful contribution. Dear All, I've just joined, so apologies if I've missed stuff.
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