Muff's Modules & More

fate · Posted: Tue Mar 06, 2012 10:30 pm Post subject:

Is it possible to chain both the boards for a total of 16 steps?, or will it still work as 2 indiividual sequencers?

Mongo1 · Posted: Tue Mar 06, 2012 10:40 pm Post subject:

fate · Posted: Wed Mar 07, 2012 6:48 am Post subject:

thanks for the quick response. I'm having trouble ordering the suggested switches from futurelec, it's been 3 weeks and i havent gotten them and they responded to my email.

"SPDT101PCSM (SPDT on-off-on Vert. PCB Mount Sub Toggle Switch) is unavailable from your order and is currently out of stock.

The replacement stock is not expected to arrive at our warehouse in the immediate future and some delay is expected."

Anyone have any other suggestions for these switches at a decent price?

Pfurmel · Posted: Wed Mar 07, 2012 6:52 am Post subject:

fonik · Posted: Wed Mar 07, 2012 7:15 am Post subject:

today i powered up the 1st and 2nd build, and they worked from the start. i just have to wire the external reset input, reset momentary button, and manual step button.

Mods:
- added a clock output, which is normalled to the external clock in (on the board the clock is disconnected from the 4017 by a trace cut).
- added "merge" button as well: if merge is selected the gates of subsequent steps get merged to one long gate.
- added a resistor to GND on the CV outputs to attenuate them.
- added diodes in line with the clock inputs, as well as from GND to the input.
- added a single gate out to each step.
- added eurorack power connectors and filtering on an additional proto PCB.

now i am waiting for the divider and seqswitch PCBs.

anyways, today i tried to create a 16-step sequence. there are two ways doing it:

1st option: clock to seqswitch's clock in and to the I/O, seqswitch set to 2-steps, each output goes to one sequencers input. the result: A1, B1, A2, B2 and so forth = 16 steps.

2nd option (did not work out so well with the symplSEQ): clock to seqswitch I/O, clock to divider, /8 divided output to seqswitch's clock in, seqswitch outputs to sequencers. i would have expected that 8 clocks would go to the 1st sequencer, then the next 8 clocks to the 2nd sequencer. at least that's what i experienced with my ADC sequencers when i tried this setup weeks ago. no i see 1 step overlap! i think this is what diablojoy anticipated!?

however, i got a 16-step sequence. when all 4 symplSEQs are built i will get 32-step sequences using the seqswitch.

[edit: picture embedded]

hexinverter · Posted: Wed Mar 07, 2012 7:54 am Post subject:

hexinverter · Posted: Wed Mar 07, 2012 7:58 am Post subject:

fonik · Posted: Wed Mar 07, 2012 8:01 am Post subject:

step overap? as soon as the clocks are handed over to the 2nd sequencer using the seqswitch, it starts going. however, the 1st sequencer does one more step. one step too far, so to say. why, i believe it is due to the propagation delays of the logic ICs - but why did i think it worked before then? i dunno.

fate · Posted: Wed Mar 07, 2012 8:15 am Post subject:

fonik · Posted: Wed Mar 07, 2012 8:20 am Post subject:

fate · Posted: Wed Mar 07, 2012 8:35 am Post subject:

Do I really need a spdt switch or can a spst be used

Barcode · Posted: Wed Mar 07, 2012 9:27 am Post subject:

bleeps · Posted: Sat Mar 10, 2012 10:51 am Post subject:

diablojoy · Posted: Sun Mar 11, 2012 3:58 am Post subject:

diablojoy · Posted: Sun Mar 11, 2012 4:05 am Post subject:

fonik · Posted: Sun Mar 11, 2012 7:32 am Post subject:

yep. just one sequential switch and you can chain up to 4 sequencer. the only thing is that they are not clocked on after the other, but iflipping: A1, B1, C1, D1, A2, B2, C2, D, 2 ... A8, B8, C8, D8.
oh, and mixers to combine the CV/gates.

diablojoy · Posted: Sun Mar 11, 2012 9:07 pm Post subject:

I went a different way with the CV's outs
instead of using a mixer,I am using a second sequential switch
clocked in sync to the first to multiplex the correct CV outs in turn
A1, B1, C1, D1, A2, B2, C2, D, 2 ... A8, B8, C8, D8 at the same time as they are stepped I believe this may avoid summing multiple cv's from different sequencers as the cv's are on 100% of the step time and not just for the gated time from the clock pulse
the gate outputs can simply be orr'd together using diodes and then reconditioned using 2 sections of a cd40106 in series to derive a master gate out.

Mongo1 · Posted: Sun Mar 11, 2012 10:07 pm Post subject:

That's right - using a mixer on the CVs would be a bad idea. You'd end up mixing the CVs from different sequencers. The results would be a real mess.

Gary

fonik · Posted: Wed Mar 14, 2012 3:27 pm Post subject:

got my 1st dual symplseq up and running together with the seqswitch. the odd thing is, that the clock switching by the seqswitch does not work properly with the internal clock. used my VC clock module instead.

here is a odd and short 1st demo:

Mongo1 · Posted: Wed Mar 14, 2012 3:52 pm Post subject:

Berry Nice indeed.

I really like the low end grumble on that setup. What are you using there?

Gary