12-volt matrix input->output?
in [Design]
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From: Jan Panteltje on 25 Feb 2007 07:15 On a sunny day (Sun, 25 Feb 2007 11:49:46 GMT) it happened Jan Panteltje <pNaonStpealmtje(a)yahoo.com> wrote in <errt4t$1gi$1(a)news.datemas.de>: >><http://www.jameco.com/Jameco/Products/ProdDS/256031FSC.pdf> > >That one is already 'on' at .8V, I'd rather use one that was on at about 6V :-) Seems I misread that, it opens at 2V, so that should be OK in both circuits, 4051 or 4028, but you still need the flyback diodes.
From: Joerg on 25 Feb 2007 16:44 John E. wrote: > Thus spake Joerg: > > >>As others have suggested this can be done using a decoder and diode to >>wire up the desired lamp combination. Instead of analog muxes you can >>also use the CD4028 and use only the A, B and C inputs. Wire D to ground. >> >>http://focus.ti.com/lit/ds/symlink/cd4028b.pdf > > > I've looked at the data sheet. Fewer pins to deal with (no inhibit, no > input/output control) -- looks more straightforward... Yep, keep it simple :-) BTW we just brought a couple back from church and his name is the same as yours. He is a retired mineral engineer. I told him and he said that he never met another person with that name. At least not in the last nine decades or so and this guy has been all over the world. -- Regards, Joerg http://www.analogconsultants.com
From: Clifford Heath on 25 Feb 2007 20:06 Joerg wrote: > BTW we just brought a couple back from church and his name is the same > as yours. He is a retired mineral engineer. I told him and he said that > he never met another person with that name. At least not in the last > nine decades or so and this guy has been all over the world. And presumably neither of them is the Jon English who sang "Hollywood Seven"...? Can't be *that* rare a name...
From: Joerg on 25 Feb 2007 21:55 Clifford Heath wrote: > Joerg wrote: > >> BTW we just brought a couple back from church and his name is the same >> as yours. He is a retired mineral engineer. I told him and he said >> that he never met another person with that name. At least not in the >> last nine decades or so and this guy has been all over the world. > > > And presumably neither of them is the Jon English who sang > "Hollywood Seven"...? Can't be *that* rare a name... If he writes his first name without the "h" that doesn't count :-) -- Regards, Joerg http://www.analogconsultants.com
From: jasen on 26 Feb 2007 02:50
On 2007-02-25, Tony Williams <tonyw(a)ledelec.demon.co.uk> wrote: > In article <0001HW.C205BA3500C4CAEEF01826C8(a)news.sf.sbcglobal.net>, > John E. <incognito(a)yahoo.com> wrote: > >> Switches Lamps >> A B C W X Y Z >> ----- ------- >> 0 1 0 1 0 0 0 >> 0 1 1 1 1 0 0 >> 1 0 0 0 0 1 0 >> 1 0 1 1 0 1 0 >> 1 1 0 1 0 0 1 >> 1 1 1 1 1 1 1 > > If you are already using relays then I think this can > be done with 3-off 4-pole changeover relays. overkill... smaller relays are sufficient +---------- W output | .-------------------|------. NC | NC | NC / | / | / / | / | / 12v---A1 | 12v---B1 '---C1 | NO---| NO----+----------NO | | | | | | NC | | / | | / | `------C2 | | NO---> X output | | | NC--------------NC | / / | / / +-------B2 .-C3 | NO---+----|----NO | | | `--------> Y output | | | | | `---------------> Z output /|\ /|\ /|\ | | | A-contacts B-contacts C-contacts A-----. B-----. C-----. | | | ___|___ ___|___ ___|___ | | | | | | | CoilA | | CoilB | | CoilC | |_______| |_______| |_______| | | | 0v----+---------------+---------------+ -- Bye. Jasen |