Can Christian Electronic Designers Design?
in [Design]
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From: D from BC on 2 Apr 2010 17:44 Huh.. The hobbists get a break and the companies purchasing test equipment dish out the extra coin out of doubt. Now I regret not reading Dave's thread.. btw... About your converter question awhile back.. You need a topology that does up and down conversion.. I do know the Cuk topo does up and down conversion. But I can't say much about the feedback for that topo. I've only done some research in the stability of Cuk down converters. -- D from BC British Columbia
From: D from BC on 2 Apr 2010 18:05 The best miracle is something impossible happening. How about an amputees legs growing back? No one has claimed new legs or arms.. It's not a miracle when someone pops two aspirins and the headache goes away. It's not a miracle when someone recovers from cancer. It's not a miracle when someone wins the lottery. It's not a miracle when someone wins the lottery on their wedding day. The about list is probable but in declining probability. I could be caught saying it's a miracle we're not dead yet from another asteroid collision. But here I try to make a mockery of the word miracle. -- D from BC British Columbia
From: D from BC on 2 Apr 2010 18:08 In article <MPG.262009e969082f77989764(a)209.197.12.12>, myrealaddress(a)comic.com says... > > The best miracle is something impossible happening. > > How about an amputees legs growing back? > No one has claimed new legs or arms.. > > It's not a miracle when someone pops two aspirins and the headache goes > away. > It's not a miracle when someone recovers from cancer. > It's not a miracle when someone wins the lottery. > It's not a miracle when someone wins the lottery on their wedding day. > The about list is probable but in declining probability. > > I could be caught saying it's a miracle we're not dead yet from another > asteroid collision. > But here I try to make a mockery of the word miracle. Correction Not 'about list'.... The 'above list'.
From: RogerN on 2 Apr 2010 18:42 "D from BC" <myrealaddress(a)comic.com> wrote in message news:MPG.262005246c4867cc989763(a)209.197.12.12... > Huh.. The hobbists get a break and the companies purchasing test > equipment dish out the extra coin out of doubt. > Now I regret not reading Dave's thread.. > > btw... About your converter question awhile back.. > You need a topology that does up and down conversion.. > I do know the Cuk topo does up and down conversion. > But I can't say much about the feedback for that topo. > I've only done some research in the stability of Cuk down converters. > > > -- > D from BC > British Columbia I've looked at some SEPIC circuits and also there is an inverting SMPS topo (flyback IIRC) that is supposed to be capable. I'll see if I can find something on the Cuk down converters. I'm wanting something similar to this: http://www.hobbypartz.com/thac6smbachw.html or these http://media.hyperion.hk/dn/eos/ Except with 4 outputs, probably multiplexed, and more computer ability (more program memory and data storage memory). I would like to keep track of how many times a battery was charged, the capacity over time, recommend when to test battery capacity, age, etc. for each battery pack the user wants to keep data on. The user could keep track of the life of the batteries and see if the cheaper packs save money, plus possibly predict likely battery failure before crashing an expensive model aircraft. Actually I want to make it open source so features can be added and new charge algorithms can be implemented for new battery technology, etc. The multi port multiplexing is great when you need to maintain multiple batteries without having to swap them out all the time. RogerN
From: Hammy on 2 Apr 2010 18:54
On Fri, 2 Apr 2010 15:10:59 -0500, "RogerN" <regor(a)midwest.net> wrote: > >"John Tserkezis" <jt(a)techniciansyndrome.org.invalid> wrote in message >news:4bb5adbd$0$5591$afc38c87(a)news.optusnet.com.au... >> Jon Kirwan wrote: >> >>> Well, there are other points. Such as whether or not it >>> qualifies as 'dishonest' for Rigol to sit mum while selling >>> the exact same physical item for nearly twice the price. >> >> I was under the impression it was more like a ~$200 difference. I >> briefly checked ebay for prices, and found ~$650-~$850 between the models. >> That sounded fair to me, which made it a challenge to support my own >> argument that it was the same hardware. >> >> Double price is another ball game altogether. They deserve what they get. > >I looked it up today and the MSRP for the 50Mhz model was $595 and the >100Mhz model was $795, I don't know if this price was up to date but you can >buy either model on eBay with a "Buy it now" and have either model for less >than the MSRP including shipping. > >RogerN > You can get a RIGOL DS1052E for $404.00 here. http://www.dealextreme.com/details.dx/sku.30573 |