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FlopSeq Sequencer Board [Updates]Goto page 1, 2, 3, 4, 5, 6, 7, 8, 9, 10  Next [all]
MUFF WIGGLER Forum Index -> Music Tech DIY
Author FlopSeq Sequencer Board [Updates]

J3RK









Hello,

These are finally ready for production. A brief description for those that haven't been following in the other thread:

This board is a simple externally clocked, 8 Step flipflop/counter based sequencer that can count upward, downward, and pingpong. The CV output range is 0-10V. The clock input has a comparator to make clocking a bit more flexible, and there is a Gate output that outputs a 10V gate pulse. There are connections for 8 pots, 8 LEDs, Mode Switch and the CV/CLK/Gate IO jacks. The board is approximately 3"x3.5". It can be clocked into low audio range.

Boards are $20 each, which includes shipping in the US. Outside the US, please add $5 Per Order (not per board.) Please reference "FlopSeq" in the Paypal subject (as there are other boards open for orders right now.)

Paypal address is:

Thanks for the interest in this project!

Note: You can combine your orders for all three of the currently available boards if you like. I'm also going to leave the 258J orders open, and close them all at once.
 

Rod Serling Fan Club









How do you prefer a person pays for different PCBs? 1 paypal pament or multiple?
 

Isaiah









Very tempting...

Is there a schematic you could share please?
I'd like to make sure I understand all of the sequencer's functions before I decide.

You mention connections for a CV pot and LED per step, but I can't tell if there is a Gate/Trigger switch per step too... I guess so if there is a Gate output, correct?

Is the Gate output the same pulse width as the Clock signal?

Cheers!
 

J3RK









Isaiah wrote:
Very tempting...

Is there a schematic you could share please?
I'd like to make sure I understand all of the sequencer's functions before I decide.

You mention connections for a CV pot and LED per step, but I can't tell if there is a Gate/Trigger switch per step too... I guess so if there is a Gate output, correct?

Is the Gate output the same pulse width as the Clock signal?

Cheers!


There is not a gate switch per step. Just a single gate output, with one pulse per step. I can plot the pulse-width tonight.
 

J3RK









Rod Serling Fan Club wrote:
How do you prefer a person pays for different PCBs? 1 paypal pament or multiple?


As long as all of the boards for the order are referenced, one order should be fine. I was trying to keep these separate early on, but it makes more sense to combine them at this point if desired.

Thanks!
 

synthnut









Hi,

Could one do something cunning with the LED outputs to make individual gate outputs? Is there any break in these between steps?

TTFN,

Ben

www.resynthesis.co.uk
www.bigbluewave.co.uk
 

FrankV









I'm feeling sort of dense here, but it's not actually clear to me whether the number of steps is adjustable. The list of controls and I/O doesn't seem to refer to a reset or control for number of steps. 8 steps all the time? Did I miss something obvious (wouldn't be the first time!)?

Frank
 

J3RK









No, no step count select. This was originally intended as a simple sequencer just for my Easel panel. Then some people expressed an interest in it. I'm working on a complex sequencer that will have step count, gate off/tie, division, 8 or 16 step versions, etc. But this will not be available for quite some time.

I'm uploading videos now, (not great quality, but...)
 

J3RK










 

J3RK










 

J3RK









Isaiah wrote:
Very tempting...

Is there a schematic you could share please?
I'd like to make sure I understand all of the sequencer's functions before I decide.

You mention connections for a CV pot and LED per step, but I can't tell if there is a Gate/Trigger switch per step too... I guess so if there is a Gate output, correct?

Is the Gate output the same pulse width as the Clock signal?

Cheers!


Edit: I need to run a quick test with an actual PWM clock actually. If I shift the waveform, the pulse-width changes on the output. However, changing the width in simulation results in no change. I believe (real world) that it does, but I want to verify it before giving you a final answer on this. I'll try running a couple more tests tomorrow for this. It functions exactly as I'd expect, but I wasn't really thinking about this when we designed it.
 

J3RK









synthnut wrote:
Hi,

Could one do something cunning with the LED outputs to make individual gate outputs? Is there any break in these between steps?

TTFN,

Ben

www.resynthesis.co.uk
www.bigbluewave.co.uk


You could probably do something along these lines. It wouldn't be pulling from the buffered clock output section though, and you may have to do something to shorten the pulse. Each LED is attached to an output of a CD4028 Bin to Dec converter. Each one is a discrete pulse (high state) for the duration of the step. (around +13V) The outputs of the 4028 are buffered, so you could probably tap these safely.

If you were using an AD envelope (or anything with little or no sustain,) the gate length shouldn't really matter, if I'm not mistaken.

This area of the board is pretty tight trace-wise, but you could tap off of the resistor leads (that are connected to each LED) if you wanted to try modding this in. Or, you could pull from the LED header, and attach the LEDs to your gate switches (or similar.) I can do a quick test with some alligator leads, and just see how well this works as a gate.
 

J3RK









BOM will be up soon.
 

synthnut









Hi,

The gate length needs to be less than 100% duty or you won't get a re-trigger when two consecutive notes have their gates selected. Though it's actually nice to be able to have the notes legato sometimes too! I'd need to AND it with the clock perhaps.
I think I leaning towards some of the complex version...! hyper

TTFN

Ben
www.resynthesis.co.uk
www.bigbluewave.co.uk
 

Isaiah









Yes, I think I may be leaning towards the complex version too, if only for the ability to Reset and turn the Gate On/Off per step.

What I meant about the pulse-width of the Gate output compared to the Clock input is:
Does it produce a pulse of fixed length per step?
Or, is it simply a Clock "through-put"?

They way I would retain the pulse-width of the input is by ANDing the Clock signal and Gate output like Synthnut said.
But when there is no means of selecting Gate On/Off per step, that seems kind of silly, just buffer the Clock input to use as the Gate output.
Unless, the Gate is fixed length.
Not sure if I'm making much sense.
 

J3RK









synthnut wrote:
Hi,

The gate length needs to be less than 100% duty or you won't get a re-trigger when two consecutive notes have their gates selected. Though it's actually nice to be able to have the notes legato sometimes too! I'd need to AND it with the clock perhaps.
I think I leaning towards some of the complex version...! hyper

TTFN

Ben
www.resynthesis.co.uk
www.bigbluewave.co.uk


We're running this through a 4093, to do this actually. The way one of the previous test versions was working it was taking 2 clock cycles for every step of the sequencer. I believe we're sitting at a fixed, smaller than 50% duty cycle on the output. I'll need to toss it back on the scope or run another sim to confirm the exact pulse width.

I figure out why it was shifting. I was trying to simulate pulse-width changes by shifting the waveform. When it was nearly all-sine, more of the wave was dropping below the comparator threshold, which altered the pulse-width of the output clock. (actually an interesting effect to look at) So rather than changing the PW, I think it was just resetting it momentarily. I'll have to confirm all of this though.

Not sure which thread I posted the response in, but there may be a fairly easy way to get separate switched gate outs. There is not however, a way to change the number of steps. (that I'm currently aware of anyway)

The complex sequencer is going to be pretty fun I think. It's quite a way off though, as this one is going to be more heavily co-developed between a friend and myself, and time that we're both available to work on it is VERY short. I'll post updates though as things progress.
 

a.b.o.z.









So those board are the base for more complex sequencer? 16 steps? gate switches?
 

J3RK









a.b.o.z. wrote:
So those board are the base for more complex sequencer? 16 steps? gate switches?


I was originally going to try to make these compatible to become "step IO" boards for the complex sequencer. We've expanded the functionality of the control board so much though, that I'm going to have to rework the IO boards. So this will be a completely separate project. These simple ones fill a slightly different need though. They're more to be used more as a granular tool for making sounds/rhythms, etc. than to be used for creating musical phrases, if that makes any sense. No reason you couldn't do either with either, that's just kind of what I had in mind for mine. I'd say that it could be useful to use both, which is kind of my plan. I'm thinking of doing a skiffish sort of thing with the complex one, and then using the simple ones in my panel more for textures/arps/etc. What I'd like to do when I get a few minutes, is get some video of these doing something aside from tonal use. Maybe sequence some filter/LPG settings, waveshape on the 258s, or FM index. (need to get my VCAs onto the panel first though for that last one)
 

glitched01









When do you expect to have the boards on-hand?
 

J3RK









I'm keeping all three boards open for orders for two weeks (starting from today more or less,) then will place the orders for the production runs. These usually take between one and two weeks. Then I will be shipping them out in batches until everyone has them. Typically on my previous runs, I've been able to get all out within a couple of weeks. It's just me though, and I have a day job, (and kids) so things occasionally get pushed out slightly where shipping is concerned. I try to keep everyone up to date though, and respond as quickly as possible. I think they would be in my hands by mid December then shipped out as quickly as possible. If things taper off, and orders stop coming in sooner, I may let everyone know, and order the boards sooner. I always find that orders start trickling in again as soon as I do this though, and my "extras" don't hold out for too long. I don't expect quite the same volume as with the original 258 runs though, so this could roll off slightly quicker. I'll be posting in these threads with any news/updates.
 

J3RK









Here's another video. This is the FlopSeq in typical forward mode. It's controlling one VCO, and a digital noise board that I just made (cut down, adapted version of Ken Stone's Digital Noise circuit (with permission.)) Which may be available as well at some point. (this would be a very cheap board compared to the other ones)

Anyway:


 

boothnavy









Is there a picture of the board somewhere? Are/can the pots & LEDs be PCB mounted or did you use flying wires?
 

iopop









Im interested in seeing the board as well.
 

boothnavy









BOM for this one as well? I hate multiple parts orders...
 

J3RK









BOM will be available soon. Just haven't had a chance to export it yet. (should only take a few minutes)

As far as board mounted pots go, you'd have to make a second board. The connections are SIL-3 headers, so you could use MTA-100 connectors, or pin-strips that connect a second board (could be perf even.) As far as putting them on this board, I don't think it would fit. The board is 3x3.5" The headers are arranged vertically, with the pins going horizontally. Like this:

...
...
...
...
...
...
...
...

I can check, but I doubt there would be room.
 
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