8-Step Sequencer with voltage controllable pattern (VCPS)

donpachi · Posted: Tue Jun 08, 2010 12:00 am Post subject: PCB arrived

I got my PCB yesterday. It looks awesome. Thanks, Matthias Cool

mattias · Joined: Jan 26, 2010 Posts: 28 Location: Cologne

Matthias,

I got my two boards today. As always very well packed .

Would you know whether we can get the ferrite beads from Reichelt? They have some ferrites but I can't identify them. Sad

I know that Jürgen Haible uses ferrite beads from RS.

Also, is the Reichelt part no für RN1 and RN2 SIL 9-8 100K?

Thanks.

fonik · Posted: Tue Jun 08, 2010 10:50 pm Post subject:

for the resistor entwork you want an 8 resistor 9 pin network in star configuration:
SIL 9-8 100k

i can't find beads at reichelt either. i use 10R resistors. it is saver anyways. the project has a lots of wiring, and a small mistake can cause a lot of troubles. a 10R resistor would hopefully protect the ICs in the worst case...

fonik · Posted: Wed Jun 09, 2010 1:21 am Post subject:

a100user · Joined: Oct 28, 2003 Posts: 158 Location: UK

Hi Matthias,

PCB's arrived.

Thank you for the great service, as usual.

David

fonik · Posted: Thu Jun 10, 2010 1:35 am Post subject:

i worked on the documentation a little bit more. it won't be the final version, though. Rolling Eyes

IMPORTANT CHANGES:
R6 is now 0k (jumper) instead of 100k.
some might want to power the module with 12V, so i gave a hint how to accomodate the ADC reference voltage (R26 at trimmer T1 shall be 200k then).
i added a 2nd option for wiring the PCB as simple 8-step seq without the ADC. saves even more parts. however, both options are not tested! i built two versions of this seq and i don't think i need another baby8.
and last but not least i explained the buffers/amplifiers that feed the CV potentiometers, and explained how to set them up (gain). you will find the new information on the BOM page.

now i am working on an explanation of the gray code (patterns) and a calibration procedure...

building documentation 10JUN2010.

sorry for the inconvenience, but writing up the docs took more time than i expected, so it is work in progress...

emdot_ambient · Joined: Nov 22, 2009 Posts: 667 Location: Frederick, MD

fonik · Posted: Thu Jun 10, 2010 1:47 pm Post subject:

bingo! the bussed ones.

beautyofdecay_ · Joined: Aug 14, 2009 Posts: 38 Location: Netherlands

Hi Matthias,

Boards received today. Excellent quality.
Looking forward to building these.

Thanks!

adambee7 · Joined: Apr 04, 2009 Posts: 420 Location: united kingdom

Arrived today, Cheers matthias. Very Happy

delayed · Joined: Jun 24, 2008 Posts: 130 Location: TN

got my board in. USA TN

Thank you,

fonik · Posted: Fri Jun 11, 2010 2:32 pm Post subject:

great.

before building download the latest version of the buildong docs (it is still work in progress, as i said before).

emdot_ambient · Joined: Nov 22, 2009 Posts: 667 Location: Frederick, MD

Boards arrived safe and sound today. Awesome.

tommi · Posted: Sat Jun 12, 2010 10:58 am Post subject:

Board arrived here too! Red one and in perfect shape! I like the PCB Very Happy

Reminds me of the x0xb0x's build...
Thanks Matthias!
And thanks for taking care of the 12Volt guys like me Wink

Skrog Productions · Posted: Sat Jun 12, 2010 2:09 pm Post subject:

2 Boards arrived safe in Scotland today , thanks very much Matthias.

Boards look fantastic , cheers.

Dave.

rosch · Joined: Oct 03, 2009 Posts: 165 Location: germany

yep mine was here on saturday too!
looks great!
thank you!

fonik · Posted: Mon Jun 14, 2010 5:04 am Post subject:

just a subtle reminder to all whom it may concern:

check your PMs inbox and/or email for payment info, boards are in...

KEYKEYEYEKIT · Joined: Sep 08, 2009 Posts: 24 Location: Atlanta

Got my boards today here in sunny Atlanta, thanks again!

scriptstyle · Joined: Jan 22, 2008 Posts: 250 Location: nj

hopefully when i get the time/money these boards will still be available. this is going to be a very chaotic summer for me...

modulus in moduli · Joined: May 14, 2010 Posts: 17 Location: USA

Got the boards! I have to finish some other projects before starting this one. I also still have to decide whether to build it in two euro modules or a double stand alone...

Christophe

fonik · Posted: Wed Jun 16, 2010 1:43 pm Post subject:

i found the stand alone build to be much easier. it is not that cramped. all the wiring, you know...

diablojoy · Posted: Thu Jun 17, 2010 2:14 am Post subject:

recieved boards in OZ today, all good , and they really do look great Very Happy

thank's mathias

tommi · Posted: Thu Jun 17, 2010 3:47 am Post subject:

Fonik,
I 've noticed that in the BOM, R8 have an asterisk wich concerns about the gain of the CV buffers. But as it's shown on schematics R8 is the timing resistor for the adc clock. Am I skeeping something?
Sorry if that's a silly question...
thanks! Very Happy

fonik · Posted: Thu Jun 17, 2010 4:01 am Post subject:

not a silly question. silly me. the asterix are leftovers from previous doc revisions. i corrected the file right now...

BTW i hope i will finish the gray code and calibration desciption on monday.

thanks.

tommi · Posted: Tue Jun 22, 2010 11:59 am Post subject:

Anyone have build it?
I finished my build yesterday but i 'm having problems. Sad

I am feeding it with +/-12V and i changed R36 to 200K. I 've also used 10K resistors on the feedback path of the CV buffers and used a jumper for R6.

I 've clocked it with an lfo's square wave and it's ok. But when i set the switches to the ADC position nothing happens... i 've only got step 8 hi and all others low, and nothing changes if i move the fine and coarse knobs or if i feed a signal to the adc input. The voltage status leds are working.
Gate and trigger out and associated leds are working.
I've connected the cv out to an oscillator and it seems that the cv pots have no effect on the output. The oscillator controlled by the cv out is flopping between two semitones like, say: step1: C, step2: C#, step3: C, step4:C#, etc etc..

I 've checked the +5V and it's where it's supposed to be.
Any hint?
Thanks,
tommi