battery chargers, again
in [Design]
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From: Rich Grise on 2 Oct 2009 13:30 On Fri, 02 Oct 2009 07:59:11 -0700, Joerg wrote: > John Larkin wrote: >> On Thu, 01 Oct 2009 14:10:05 -0700, Rich Grise <richgrise(a)example.net> >>> On Wed, 30 Sep 2009 20:38:29 -0400, Spehro Pefhany wrote: >>>>> Keep it up. >:-> It helps dispel that "leprechaun" image. ;-D >>>> Something like this http://www.speff.com/jl.jpg ? >>>> >>> Eek! Heavens, no! John is cute as a button! It's just that he's about >>> 5'6" or so, a bit wiry, and Irish. :-) (I met him face-to-face at a trade >>> show in Long Beach a couple of years ago, and picked up some of his >>> refrigerator magnets.) :-) >> >> That's what we give out these days, instead of pots of gold. > > Just got assembled boards back from AA-PCB yesterday. They threw in a > bag of trail mix. Sweet. Needless to say, it was all gone before I had > the first scope shots on the server and I wasn't too hungry at dinner time. Did it loook like it was packed intentionally, or more like it fell out of an inattentive packer's pocket? ;-) Cheers! Rich
From: Rich Grise, Plainclothes Hippie on 2 Oct 2009 13:32 On Fri, 02 Oct 2009 08:13:19 -0700, Joerg wrote: > Jim Thompson wrote: >> On Fri, 02 Oct 2009 07:59:11 -0700, Joerg <invalid(a)invalid.invalid> >> >> [snip] >>> Just got assembled boards back from AA-PCB yesterday. They threw in a >>> bag of trail mix. Sweet. Needless to say, it was all gone before I had >>> the first scope shots on the server and I wasn't too hungry at dinner time. >> >> Funny what extraneous stuff can end up in a shipment. Recently found >> a chocolate chip 2-pack in my Amazon order ;-) > > They seem to do that with all shipments. The one last week also had > trail mix in it but arrived at a client so their engineers got to enjoy it. Once, while on recycling duty, I was breaking down boxes, and found two 12-packs of brand new pencils. ;-) Cheers! Rich
From: John Larkin on 2 Oct 2009 13:39 On Fri, 02 Oct 2009 09:49:50 -0700, Joerg <invalid(a)invalid.invalid> wrote: >John Larkin wrote: >> On Fri, 02 Oct 2009 08:59:14 -0700, Joerg <invalid(a)invalid.invalid> >> wrote: >> >>> John Larkin wrote: > >[...] > >>>> Maybe I'll include an FM deviation trimpot on the board. ... >>> >>> Trimpot? Euww ... >> >> The point being that, when the actual instrument is up and being >> driven by chemists, I'd like a quick and easy way to play with the >> spread-spectrum parameters to see the effects. I can always nail down >> the values once I know what works best. I often use fixed resistors >> but also put down pads for a pot so we can tweak the first articles >> without soldering. >> > >I just had my potmeter comeuppance yesterday. I am very much against >those things and it proved the point. Built a tester jig for a client, >just for engineering, they didn't want SCADA controls on that (tried to >convince them and now wish they had agreed ...). Sure enough the Murata >"10-turn" potmeter exhibits a huge dead spot around the point where they >said they wanted it. Like a half turn of slack and you can't get the pot >inside that area. Hurumph! > >I believe nowadays they just put cheap regular pots in there and roach a >worm gear onto them so they can be called 10-turn. Yes. Single-turn trimpots are as good as, or better than, most multi-turns. And the singles are less likely to jump in value if shocked later. We did find a trimpot that makes a good DC-to-1 GHz gain trimmer, which is really hard to do any other way. Digital pots have rotten bandwidths. Ditto MDACs. VGAs aren't accurate at DC. Fets and such, if you can make them fast enough, have distortion and temperature problems. PINs don't work at low frequencies. Wot's a boy to do? John > >[...]
From: Joerg on 2 Oct 2009 13:49 John Larkin wrote: > On Fri, 02 Oct 2009 07:59:11 -0700, Joerg <invalid(a)invalid.invalid> > wrote: > >> John Larkin wrote: >>> On Thu, 01 Oct 2009 14:10:05 -0700, Rich Grise <richgrise(a)example.net> >>> wrote: >>> >>>> On Wed, 30 Sep 2009 20:38:29 -0400, Spehro Pefhany wrote: >>>>> On Tue, 29 Sep 2009 15:18:12 -0700, the renowned Rich Grise >>>>>> On Tue, 29 Sep 2009 10:24:57 -0700, John Larkin wrote: >>>>>>> ... >>>>>>> I guess several of the posters here, if they left their lights on and >>>>>>> killed their battery, will always have their car towed and the battery >>>>>>> replaced. They have no need for jumper cables, and are happy buying >>>>>>> chargers that only charge batteries that don't need to be charged. >>>>>>> >>>>>> Ouch! John, I've never heard you scathe before, but geez! This post >>>>>> singed my eyebrows! >>>>>> >>>>>> Keep it up. >:-> It helps dispel that "leprechaun" image. ;-D >>>>> Something like this http://www.speff.com/jl.jpg ? >>>>> >>>> Eek! Heavens, no! John is cute as a button! It's just that he's about >>>> 5'6" or so, a bit wiry, and Irish. :-) (I met him face-to-face at a trade >>>> show in Long Beach a couple of years ago, and picked up some of his >>>> refrigerator magnets.) :-) >>>> >>> That's what we give out these days, instead of pots of gold. >>> >> Just got assembled boards back from AA-PCB yesterday. They threw in a >> bag of trail mix. > > > I usually get Bible verse flyers. > I wouldn't mind those at all. But wasn't it you guys who have a custom transformer vendor sending home-baked cookies along? -- Regards, Joerg http://www.analogconsultants.com/ "gmail" domain blocked because of excessive spam. Use another domain or send PM.
From: Joerg on 2 Oct 2009 13:49
Rich Grise wrote: > On Fri, 02 Oct 2009 07:59:11 -0700, Joerg wrote: >> John Larkin wrote: >>> On Thu, 01 Oct 2009 14:10:05 -0700, Rich Grise <richgrise(a)example.net> >>>> On Wed, 30 Sep 2009 20:38:29 -0400, Spehro Pefhany wrote: >>>>>> Keep it up. >:-> It helps dispel that "leprechaun" image. ;-D >>>>> Something like this http://www.speff.com/jl.jpg ? >>>>> >>>> Eek! Heavens, no! John is cute as a button! It's just that he's about >>>> 5'6" or so, a bit wiry, and Irish. :-) (I met him face-to-face at a trade >>>> show in Long Beach a couple of years ago, and picked up some of his >>>> refrigerator magnets.) :-) >>> That's what we give out these days, instead of pots of gold. >> Just got assembled boards back from AA-PCB yesterday. They threw in a >> bag of trail mix. Sweet. Needless to say, it was all gone before I had >> the first scope shots on the server and I wasn't too hungry at dinner time. > > Did it loook like it was packed intentionally, or more like it fell out > of an inattentive packer's pocket? ;-) > Nope, same thing with another delivery to a client last week. -- Regards, Joerg http://www.analogconsultants.com/ "gmail" domain blocked because of excessive spam. Use another domain or send PM. |