Math Trigger Sequencer w/ ALU (for DotCom, curetronic)

[trouby]

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
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]

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.

[Rykhaard]

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

[trouby]

me, too - sound demo not yet - it's like an semi-random sequencer
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.

[Rykhaard]

[glacial23]

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.

[trouby]

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]

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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