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 Forum index » Instruments and Equipment » Modular Synthesis
Math Trigger Sequencer w/ ALU (for DotCom, curetronic)
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trouby



Joined: May 08, 2010
Posts: 23
Location: germany

PostPosted: Thu Jun 24, 2010 5:00 am    Post subject: Math Trigger Sequencer w/ ALU (for DotCom, curetronic) Reply with quote  Mark this post and the followings unread

a new gimmick is finished ans contains a 4bit ALU - arithmetical-logical unit - it can do math. 4bit = 16 steps - 1 bar - sequencer.
it has a clock and S/S/Go input, a switch and 16 outs - for each result one.
the ALU has: 2 operands A & B, the function itself get clocked by a counter, the result goes to a line decoder ans trigger converter.
the result is visualized.
cased of the constant values but variant function the result varies in different ways - some combinations has every value of the 4bits but as difference sequence Smile
to trigger percussive sounds - 2 beatboxes in bad condition have to die for external trigger (will be 19" case)

power is curetronic - DotCom can be a place problem:
top & bottom place for mounting is 10mm - not 12,7 for 1/2"...


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trouby



Joined: May 08, 2010
Posts: 23
Location: germany

PostPosted: Sat Jul 10, 2010 4:49 am    Post subject: Reply with quote  Mark this post and the followings unread

i found out some values to keep explicit every value result - 16 different values at 16 steps - each are triggered; mostly at arith. & logical:

13 - 6, 13 - 7, 11 - 4, 11 - 7, 10 - 4, 6 - 4

highest bit seems to be different.
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Rykhaard



Joined: Sep 02, 2007
Posts: 1290
Location: Canada

PostPosted: Sat Jul 10, 2010 5:17 am    Post subject: Reply with quote  Mark this post and the followings unread

I'm very curious as to what the sequences SOUND like! Very Happy Any sound clips of them?
How is it operating? PIC / ARM based?
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trouby



Joined: May 08, 2010
Posts: 23
Location: germany

PostPosted: Sat Jul 10, 2010 8:19 am    Post subject: Reply with quote  Mark this post and the followings unread

me, too - sound demo not yet - it's like an semi-random sequencer Smile
i need 16 sound generators, esp. 2 beatboxes which i still need 1.

it's an ALU inside, the 74181, and a 4514 line decoder.
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Rykhaard



Joined: Sep 02, 2007
Posts: 1290
Location: Canada

PostPosted: Sat Jul 10, 2010 8:35 am    Post subject: Reply with quote  Mark this post and the followings unread

trouby wrote:
me, too - sound demo not yet - it's like an semi-random sequencer Smile
i need 16 sound generators, esp. 2 beatboxes which i still need 1.

it's an ALU inside, the 74181, and a 4514 line decoder.


Ohhhp. Surprised Smile Leaves me out of building, for the mo' then. Wink

16 sound generators? Could the outputs not be summed, or logically dealt with? Or to a multiplexer? (Or - am I missing the point here? Surprised Smile ) Coming back to summing, I think could be gooder. No?
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glacial23



Joined: Apr 30, 2008
Posts: 32
Location: Cleveland, OH

PostPosted: Tue Jul 13, 2010 11:39 am    Post subject: Reply with quote  Mark this post and the followings unread

Oh, very nice! I've been wanting to build something with ALU chips for a while now. I bought some 74181s and 40181s, but haven't quite done anything with them yet.

I thought it would be interesting to have voltage control over the operation (using a 4-bit ADC or something), but just clocking it seems like a good idea too.

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trouby



Joined: May 08, 2010
Posts: 23
Location: germany

PostPosted: Sun Jul 01, 2018 11:01 am    Post subject: Reply with quote  Mark this post and the followings unread

after years of developing, i did an eurorack version w/ dual CV input (w/ ADC). zero series on ebay, full version has 4mm LEDs. 65-70 mm deep, 22 UE wide.


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MrsWedge



Joined: Jul 08, 2018
Posts: 1
Location: Philadelphia

PostPosted: Sun Jul 08, 2018 10:15 am    Post subject: Reply with quote  Mark this post and the followings unread

Here's one I made for my diy optically patched synth. It uses 2 bits of a 74ls181 ALU chip. The 4 control inputs, which select any of the sixteen possible logic functions, are the 4 in a circle around the "C".


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