M185 sequencer Project - NEW PCB VERSION

[ryktnk]

Hello

I have been working on some modifications for the
M185 sequencer recently.

I have realised I don't use the CV stage control much, so
have made an alternate version of the software - V2.1.

This "mode 4" control is now a fixed length mode.
The sequence can be set to a fixed length [selectable in multiples of 2].
So even when you adjust individual stage lengths the sequence
length doesn't change.
This is great for dance music type stuff where you are syncing to
a drumbox and want the loop to repeat with the drumbox.

The spare input from the CV stage control can now be used [with
a little bit of modding and a CMOS 4066] as an output to control
the portamento, so you can program the note slide on or off
for each sequence stage.

PM me if you want the software update.

Also I will try and post the mod. schematics for the portamento control.

-ryk

[xpmtl]

ow, completly forgot to check this thread

Do u have any pcb left? i'm interested by 2 pcbs with pics.

if they all gone can u add me on the waiting list.

Thanks

[ryktnk]

[ryktnk]

Here are some details for the programmable portamento mod I have been
working on.

There are two options for this mod.

OPTION [1]
This requires the V2.1 software, and means you will relinquish the CV stage
control functionality, but you do get the new mode4 "fixed length sequence
mode" !
The portamento is set via programming each stage, using the "hold reset"
switch method described in the docs.
The settings are retained on power off.

OPTION [2]
This doesn't require new software, but you will need to add 8 1P2W switches
to the panel, and a bit more spaghetti wiring !



Option [1]

First of all if you have already built the PCB then remove the following
components:-

Q6, R13, R16. R19, R21

If you haven't built the PCB yet then do not include these components.

Then wire up a 4066 chip on a small piece of veroboard, using the
"Portamento mod opt 1" schematic diagram.
The mod board is connected to the main PCB via the GRND, +5, PORT1, PORT2

connectors, and PIN3 of the PIC chip.
Make sure the 4066 mod board is insulated and attach to the main PCB.


Option [2]

Wire up a 4066 chip on a small piece of veroboard, using the
"Portamento mod opt 2" schematic diagram.
You will need 8 1p2w toggle switches, 8 in4148 diodes, and a 1M resistor.
The switches are wired from the POT1 - POT8 connectors on the main PCB,
and to the mod board via the diodes.
The mod board is connected to the main PCB via the GRND, +5, PORT1, & PORT2

connectors.
Make sure the 4066 mod board is insulated and attach to the main PCB.

-ryk

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[lexvortex]

Hi,

Here is my version of the M-185 sequencer, it's based on Ryk's design but in MOTM format. It was a tricky build but well worth it Those little switches are a tight fit! I managed to get it running without too much trouble. Thanks again for offering this excellent project

Cheers,
Dave

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[janvanvolt]

Hi Dave,

lucky you i am still working on mine. Short question which you might be able to answer which is correct:

(a) wire up all P1-P8 1:1 and then add the resistors on P1
or
(b) add resistors on P1 and wire up P2-P8 and then connect it to the "resistor" points as well.

or even easier: show me the back of your frontpanel.

[lexvortex]

Hi Unit-sound,

(a) is what I did, connect all the switches (1-8 ) in parallel and the resistors go on switch one only as shown on the diagram. I was initially confused at this too, actually at first I thought I was going to have to add resistors to all the switches then I read though the construction guide and carefully followed the diagram and after a lot of wiring got through it although i think the portamento pot is shown wired backwards on the wiring diagram, it's an easy fix anyways if you have to fix it.

Cheers,
Dave

[ryktnk]

Hello

Thanks Dave, that is correct.

Also your seq. looks great, congrats.

Sorry about the portamento pot error . . .

The wiring diagram is on page5 of this
thread if anyone else is puzzeld.

-ryk

[numbernone]

I would also love to see a shot of its backside, the front looks kickass! Real NASA vibe.

Also, where did you score your screws for the switches? Awesome look there as well.

[lexvortex]

Hi,

[numbernone]

WOW thanks Dave. Looks great, pretty much I what I had envisioned for the vertical columns of wiring. And double thanks for the link to the screws, I am very bad with such things.

Time to order my panels.

[janvanvolt]

Panel wiring was really a mess doing it (and correcting errors) but ...

it sounds awesome it is really worth all the soldering and asssembling

[lexvortex]

Hi,

I've finished the M-185 and it all seems to work great except for when I start the internal clock, the clock starts out fast then slows down and holds the tempo more or less form then on. What could cause this behaviour?

Thanks,
Dave

[ryktnk]

[lexvortex]

Hi Ryk,

I looked for wrong value resistors around IC 3 and they were all correct, I checked for a voltage drop or surge from IC 5 but the voltage was steady throughout. C1 is correct too.
When I first fired up the sequencer I had W3-W4 linked which made the internal clock not work at all. Could this have damaged something? I also do not have W2-W5 linked.

Thanks for the help ,
Dave

[LektroiD]

Is there any chance we can get updated build docs for the 2.1 update (I bought mine with v2.1 PIC), I'm scanning up and down this thread getting mighty confused, I feel I'm going to make a mess of it all if I don't have it all concise and in one document.

I hope this is not too much hassle.

[LektroiD]

Is there any chance we can get updated build docs for the 2.1 update (I bought mine with v2.1 PIC), I'm scanning up and down this thread getting mighty confused, I feel I'm going to make a mess of it all if I don't have it all concise and in one document.

I hope this is not too much hassle.

[ryktnk]

Hello

Sorry for the delay.
Here is the definitive documentation for the V2.1 version of this sequencer.

Please note these documents are only for use with V2.1 software, and are not an update on the existing documents.

Thanks

-ryk

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M185_V2.1_BOM.pdf
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M185_V2.1_construction_notes.pdf
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M185_V2.1_manual.pdf
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M185_V2.1_panel_wiring.pdf
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[ryktnk]

[lexvortex]

Hi Ryk,

[funkyfarm]

[ryktnk]

[funkyfarm]

Thank you for your answer, ryktnk

[LektroiD]

[ryktnk]