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dnny
Joined: Mar 12, 2005 Posts: 519 Location: Helsinki, Finland
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Posted: Thu Oct 26, 2006 2:51 pm Post subject:
mystery binary chip? Subject description: the quest to random sequencing |
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Hi all,
it´s been a while... I´m building this one device/instrument that makes the mechanical noise you hear when big relays go on and off... but i have a problem - i used to control my prototype whit my Jands light console cause i could get random triggers from it easily. now i want to make the random triggers whiteout that heavy controller...
so here is what i have planed:
i would make four simple OSC´s that would make the mystery chips four data inputs go high and low. And then there would be a clock signal and on every time the clock would go high (or low) it would read the data inputs and output to eight(or more) outputs depending on the data read.
the truth table would look something like this
inputs - output
0000 = 0
0001 = 1
0010 = 2
0011 = 3
0100 = 4
0101 = 5
0110 = 6
0111 = 7
1000 = 8
and so ... basic binary
but the big question is - What is this chip? I´m almost sure there is one that functions like this - but i don´t know what is it.
or if you have any other suggestions on how to make eight random triggers/gates please turn me to right direction.
the relay beater is just relays controlled by smaller relays controlled by darlington transistors.
the transistors input +5V signal but that´s not important. if i could get some random signals i could then adjust it to be the desired +5V
will you please help me?
here is a pic of the prototype i had - it´s now in new box
thanks for your time
daniel _________________ Association of experimental electronics
www.koelse.org
flickr: cable porn group Last edited by dnny on Fri Oct 27, 2006 5:57 am; edited 1 time in total |
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blue hell
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Joined: Apr 03, 2004 Posts: 24075 Location: The Netherlands, Enschede
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toppobrillo
Joined: Dec 10, 2005 Posts: 766 Location: oakland, ca
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Posted: Thu Oct 26, 2006 4:03 pm Post subject:
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the 4051 is an 8:1 MUX/DEMUX with 3 address lines which is all you need to cycle through 8 counts [0-7] it has an enable pin and of course an I/O also.
I use this chip to switch analog and digital signals, it's pretty awesome |
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dnny
Joined: Mar 12, 2005 Posts: 519 Location: Helsinki, Finland
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Posted: Thu Oct 26, 2006 4:05 pm Post subject:
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wow that was fast.
Thanks Jan and topp,
i think i will go whit that CD4514 so i can strobe it whit Ken Stone's Psycho LFO
for even more randomness. and i also want empty steps in between. but i will take a look on that 4051 - hmm.. three lines, that would be one OSC less ... lets see.
Andrew if you read this - how about a stripboard of that loony LFO?
thanks again _________________ Association of experimental electronics
www.koelse.org
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Uncle Krunkus
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Joined: Jul 11, 2005 Posts: 4761 Location: Sydney, Australia
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Posted: Fri Oct 27, 2006 4:30 am Post subject:
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Isn't it just a simple binary to decimal decoder? _________________ What makes a space ours, is what we put there, and what we do there. |
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Uncle Krunkus
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Joined: Jul 11, 2005 Posts: 4761 Location: Sydney, Australia
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Posted: Fri Oct 27, 2006 4:32 am Post subject:
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Where resides this looney LFO of which you speak grasshopper? _________________ What makes a space ours, is what we put there, and what we do there. |
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dnny
Joined: Mar 12, 2005 Posts: 519 Location: Helsinki, Finland
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blue hell
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Joined: Apr 03, 2004 Posts: 24075 Location: The Netherlands, Enschede
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Posted: Fri Oct 27, 2006 5:12 am Post subject:
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Uncle Krunkus wrote: | Isn't it just a simple binary to decimal decoder? |
Yes, as that would be an example of the same thing (with a few outputs left out), see the 7442 link above. The 4051 could be used just as well when 8 outputs would be enough (or it could be cascaded). Both however have no strobe input and would need an additional chip for memorizing the input on a clock edge. The 4514 (or 4515 for inverse output polarity) might be hard to find though.
Compromises, as usual _________________ Jan
also .. could someone please turn down the thermostat a bit.
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dnny
Joined: Mar 12, 2005 Posts: 519 Location: Helsinki, Finland
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Posted: Fri Oct 27, 2006 5:53 am Post subject:
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now that you started talking on the memorizing the input. I came up whit this kind of idea - if i could find the 4514 or 4515, i would like to see witch output is high - so what do you think of this kind of 7-segment display?
what would be the memorizing chip to kind of sample and hold the data for the 7-segment display driver?
or in the case i don't find the 4514 or 4515 what would be the memory chip to add to have strobing function?
thanks for all this info _________________ Association of experimental electronics
www.koelse.org
flickr: cable porn group Last edited by dnny on Fri Oct 27, 2006 3:04 pm; edited 1 time in total |
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dnny
Joined: Mar 12, 2005 Posts: 519 Location: Helsinki, Finland
Audio files: 8
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Posted: Fri Oct 27, 2006 3:03 pm Post subject:
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Hi all,
sorry for bugging you, but i have more questions - can't help it.
could i use the CMOS 4076 (CMOS 4-BIT D-TYPE REGISTERS) for memorizing the four bits?
and how about the "data disable inputs" and "output disable" how should i wire them to get the desired function? _________________ Association of experimental electronics
www.koelse.org
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blue hell
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Joined: Apr 03, 2004 Posts: 24075 Location: The Netherlands, Enschede
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Posted: Fri Oct 27, 2006 4:23 pm Post subject:
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Yes 4076 would be fine, just tie the input and output disables all to ground to not disable those.
And now that you have this chip anyway (for the display) .... the latched decoder (4514) could now be replaced by an unlatched one, like a BCD to decimal decoder (like 74HC42), which is likely to be found cheaper.
When you want to mix the cmos 4000 or 4500 series with 7400 type ICs be sure to use the HC version of the latter.
Some alternatives (to get all logic in the same 7400 family) for the 4076 could be 74HC174, 74HC175, 74HC273, 74HC374, 74HC377, 74HC378 or 74HC379 (all clocked D-type flip-flops as well). _________________ Jan
also .. could someone please turn down the thermostat a bit.
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dnny
Joined: Mar 12, 2005 Posts: 519 Location: Helsinki, Finland
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Posted: Fri Oct 27, 2006 5:07 pm Post subject:
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thank you so much.
i will breadboard this, as soon as i get all the parts. _________________ Association of experimental electronics
www.koelse.org
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