mfos 16 step quantized vary-step-length sequencer

dancelwerk · Posted: Sun Dec 22, 2013 3:34 pm Post subject:

i solved the problem with my vari-clock add to the old 16 step sequencer, the fault was in a TL074, in U3A, the stepped ramp was out, I replace with another and voila!!!!!

i hope this works to the other people with problems.

now all works fine..................yeaaaah

Skrog Productions · Posted: Mon Dec 23, 2013 12:15 am Post subject:

Excellent

, glad you kept going and found the problem.

My faults i had were partly to not reading the very first set of instructions thoroughly Smile

(A/D clock freq.)

I wonder just how many builders have completed this or given up half way through , it seems there were only a handfull of folk having a stab when it came out and not a lot in the way of completed units 1 year later.

BUT , when it does work after all the integration with the other pcbs it's a great add on .
Ray just needs to offer a X2 clock multiplier mod for studios with more than 1 MFOS sequencer ( the vari seq runs at half an external clock rate)
Though i hope to have a go at a clock multiplier with a cd4046 & 4017 phase locked loop design over the holidays Smile

have lots of fun with the working sequencer now Smile

Dave.

dancelwerk · Posted: Tue Dec 24, 2013 4:11 am Post subject:

when you speaks about the half speed of the clock, i suppose you are refering that when you put the sequencer in quantized and external mode the sequencer goes to normal mode, this is my case, i don't know if this is normal,is it?, i lost the add on of quantized notes and the sequencer returns to normal mode, if you refers to solve this problem it will be wonderfull.

Keep me informed, thanks in advance

Merry Christmas and Happy new year

Skrog Productions · Posted: Fri Dec 27, 2013 8:49 am Post subject:

Hi , Merry xmas Smile

In the instructions it is part of the design of the new clock circuit to half the speed of an external clock coming in, i was posting about that Smile

If your having a problem with the quantized steps check the documents where it explains about the D-A clock needing to be around 54Khz for the binary led's to match correct operation.
Ray has added some more text to the older instructions for this sequencer add on a few months ago , on the mfos site.

good luck

Dave.

dancelwerk · Posted: Fri Dec 27, 2013 2:56 pm Post subject:

Merry Xmas too!!!,

i have exactly 54 khz in the sequencer, the binary leds works good, it is only that when i have a sequence quantized and put the switch to external the sequencer return to the normal mode and quantized notes dissapear.

you say:
"In the instructions it is part of the design of the new clock circuit to half the speed of an external clock coming in, i was posting about that"

Is in this topic or another topic?

Thanks in advance.

Fernando.

Skrog Productions · Posted: Sat Dec 28, 2013 2:24 am Post subject:

Skrog Productions · Posted: Sat Dec 28, 2013 2:52 am Post subject:

AAHHHH!!! hold on , the thick fog is clearing Smile

If i remember right when i first got this sequencer built , i noticed when wired as the instructions , an external clock only advanced the standard 16 steps , the vari clock function was still hard wired to the master clock U6-F , i made a modification to have the whole unit responding to an external clock bypassing the internal clock , for the moment i cannot remember how i did that , and i've got the sequencer all patched up for the New Year electro-music concert (Epicyclus) , in a week or so i'll have a look Smile

Skrog Productions · Posted: Sat Dec 28, 2013 2:54 am Post subject:

here we go .....this post must have sunk back 3 or 4 pages Very Happy

http://electro-music.com/forum/topic-56345.html

Dave.

dancelwerk · Posted: Sat Dec 28, 2013 3:13 am Post subject:

ok, no problem take your time, thanks a lot, it will be wonderfull to get the variclock sequenced to other external clock, a 909 clap trigger for example
Razz

hansbuscher · Joined: Jun 01, 2015 Posts: 2 Location: Los Angeles

Hello Skrog. When you subbed the 12 position rotary switch for the analogue pot to choose 1 of 16 clocks per. Which 12 intervals did you choose? 1, 2, 3, 4, 5, 6, 7, 8, 10, 12, 14, 16?

thanks!

Hubaswift · Joined: Jul 06, 2016 Posts: 91 Location: Canada

^ I'm curious about that as well. I've been meaning to make two of these sequencers for quite some time using rotary switches.

I also have a panel design as a cad file if anyone is planning on building it in 5U/MU. It's 11MU wide.

Skrog Productions · Posted: Mon Feb 26, 2018 11:21 am Post subject:

Hi Guys , i stripped that sequencer down to make the mfos super sequencer in 2015 Smile

http://electro-music.com/forum/topic-63821.html

I was having a whole host of problems integrating it with the rest of my sequencers & clocks , if i remember right i think i limited myself to just 12 steps 1 to 12 , the RYK M-185 vari step sequencer i built ages ago has a max of 8 sub steps per step and that was more than enough for my usual melodic sequencing M-185.... http://electro-music.com/forum/download.php?id=24032

Dave Smile