12-volt matrix input->output?
in [Design]
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From: Joerg on 27 Feb 2007 22:12 Rich Grise wrote: > On Wed, 28 Feb 2007 02:03:28 +0000, Rich Grise wrote: > > >>On Sat, 24 Feb 2007 12:39:20 -0800, Joerg wrote: >> >>>John E. wrote: >>> >>> >>>>I want to turn on 4 lamps in 6 combinations. These are controlled by 3 >>>>switches in 6 corresponding combinations of contact closings. >>>> >>>>The truth table looks like this >>>> >>>>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 >>>> >>> >>>http://focus.ti.com/lit/ds/symlink/cd4028b.pdf >>> >>>Digikey has it in stock even in the old DIP version, 52 cents a pop. If >>>you need more than a milliamp or so you could use a driver from the ULN >>>series. >> >>74AC138, and some diodes: >> >> 138 outputs: A B C D >> 000 | | | | >> --------------------------- >> 001 | | | | >> --------------------------- >> 010 | | | | >> --------------X----X----X >> 011 | | | | >> -------------------X----X >> 100 | | | | >> ---------X----X---------X >> 101 | | | | >> --------------X---------X >> 110 | | | | >> --------------X----X------ >> 111 | | | | >> -------------------------- >> >>Where "X" is one diode of a diode OR, connected the usual way; >>the unused inputs default to 1111 for the output, since the 138 >>is active low. To make the default 0000, just strap all of the >>unused outputs with all four diodes. >> > > > As long as I have it right here, > http://focus.ti.com/lit/ds/symlink/cd74ac138.pdf > > This could be built on a protoboard with vertical diodes and flying > wires across their tops. :-) > > Ooops! It's a 5V part. ... It might have worked. For about 100msec or so :-))) > ... I guess the 4028 will do it, but the outputs > aren't all nicely lined up like on the 138, so it'd be harder to do > on a protoboard. :-) > No problem. In the lab nothing looks more high-tech than a nice big Sauerkraut ball of wires. -- Regards, Joerg http://www.analogconsultants.com
From: jasen on 28 Feb 2007 05:13 On 2007-02-27, Tony Williams <tonyw(a)ledelec.demon.co.uk> wrote: > In article <eru3fq$hb5$1(a)jasen.is-a-geek.org>, > jasen <jasen(a)free.net.nz> wrote: > > > I guessed it could be simplified but was too lazy > to try it. Nice try, but could you check your > ascii diagram for typos, there seems to be > something wrong. > > eg, Look at the req'd '010' input, '1000' output. > > The B-relay is closed, connecting B1-NO and B2-NO. > This does not produce a 1 on the W output? > > There are other anomolies. Contact C3 shorts > Y and Z together, but look at the '101' input, > this requires Y and Z to be different. > > There's a typo or I'm not reading your circuit > correctly. OOPS! you're right The circuit I posted was incorrect. here's a corrected version. >> >> 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 .------------. .------> W output | | | | .--|--|------. | NC | | | NC | / | | | / | / | | | / 12v-+--B1 | | '---C1 | | NO--+ `---------NO | | | | NC | / | / `---------C2 NO---> X output .------------------. � | | NC | NC-----|--------NC / | / | / / | / | / 12v--A1 +-------B2 | .-C3 | | | NO---' NO--. `--|-----NO | | | `--------> Y output | `--------------> Z output /|\ /|\ /|\ | | | A-contacts B-contacts C-contacts A-----. B-----. C-----. | | | ___|___ ___|___ ___|___ | | | | | | | CoilA | | CoilB | | CoilC | |_______| |_______| |_______| | | | 0v----+---------------+---------------+ -- Bye. Jasen
From: Tony Williams on 28 Feb 2007 10:12 In article <es3kkn$6sb$1(a)jasen.is-a-geek.org>, jasen <jasen(a)free.net.nz> wrote: > The circuit I posted was incorrect. > here's a corrected version. [snip rest] That looks like a goer. Well done, nice bit of simplification. Maybe use 4-off 2PCO relays, (2 in // to get the 3x C-contacts), in chassis-mount sockets. Add 3x flyback diodes across the coils. Just wiring, no soldering, no pcb. -- Tony Williams.
From: Jan Panteltje on 28 Feb 2007 10:29 On a sunny day (Wed, 28 Feb 2007 15:12:30 +0000 (GMT)) it happened Tony Williams <tonyw(a)ledelec.demon.co.uk> wrote in <4ebc4a4b91tonyw(a)ledelec.demon.co.uk>: >In article <es3kkn$6sb$1(a)jasen.is-a-geek.org>, > jasen <jasen(a)free.net.nz> wrote: > >> The circuit I posted was incorrect. >> here's a corrected version. > [snip rest] > > That looks like a goer. Well done, nice bit > of simplification. Maybe use 4-off 2PCO > relays, (2 in // to get the 3x C-contacts), > in chassis-mount sockets. Add 3x flyback > diodes across the coils. Just wiring, no > soldering, no pcb. > >-- >Tony Williams. One company where I worked would have sold the OP a PLC :-)
From: Rich Grise on 28 Feb 2007 20:01
On Wed, 28 Feb 2007 03:09:36 +0000, Joerg wrote: > Rich Grise wrote: >> On Sun, 25 Feb 2007 13:44:40 -0800, Joerg wrote: >>>John E. wrote: >>>>Thus spake Joerg: >>>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. >> >> Not even Johnathan E from "Rollerball"? ;-) >> > To be honest I don't know who that is. http://www.scifimoviepage.com/rollerball.html Cheers! Rich |