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[Closed] Bipolar mixer / offset boards
MUFF WIGGLER Forum Index -> Music Tech DIY  
Author [Closed] Bipolar mixer / offset boards
theabsent
* update Sep28 2012 * All sent out!

* update Sep26 2012 * PCBs have arrived. I'll start shipping next monday. Non-EU orders will be sent first.

PCB: 9.40 Euros, Panel 16.50 Euros. These prices include shipping inside the EU.

* edit Sep 5th 2011 * Second round!

* edit July 15th 2011 * BOM is available at the end of this post

PM me for PayPal details. When you PayPal me please include your Muff Wiggler nick in the message and of course quantities how many pcbs and/or panels you order.

Shipping will start as soon as I have all the boards and panels here. Last time it took only one day to get them all out.

PayPal payment is the only way to reserve anything. I will not order or hold any boards or panels without payment. Sorry for that, but I have had bad experiences in the past people not paying their orders.

- - - - -

You will find all the relevant updates in this first post!

I have been asked several times about the possibility to buy BiMix mixer boards.

Because it would be useful to have these boards in hand for my future projects, I decided to check whether there would be any interest in a group buy?

You can read about the module here:
https://www.muffwiggler.com/forum/viewtopic.php?t=34410

* I won't do ready made modules.
* I won't do any kits. Just bare pcb is offered. All the parts are pretty basic and normally available in stores.
* I'll do a panel run if there is enough interest. Panel can be seen in the BiMix thread.
* I will provide BOM
* I won't be able to help with building. I don't have time for that. You have to have some knowledge about building these things.

Board is approximately 105mm x 44mm in size. Through hole / single sided / silk screened / with solder mask. Board can be panel mounted with 9mm Alpha pots or similar.

Module was done for the +-12V eurorack system. I have tested it in my frac rack and it works fine with +-15V power too. Only one resistor should be changed to different value.

Prices:

9.40 euros per pcb

16.50 euros per panel.

These prices include the shipping inside the EU.
All the shipments to non-EU countries: add 8 euros per order because I have to use registered shipping.


Material list for the board:

4x 0.1uF (100nF) capacitor
4x 47pF capasitor

2x 10uF electrolytic capacitor

4x 100k linear potentiometer + knobs
(9mm Alpha pots or similar if you want to panel mount the board with pots)

1x 82k resistor
- 82k will give a bit over 6V offset in +/-12V system
- 140K would be 5V in in +/-12V system
- In +/-15v system the values are approx. 130K and 200K
- you can use anything between those figures

10x 100k resistor (use 1% or better)
1x 1k resistor

2x ferrite beads / 10R resistors

4x 3 pin jumpers for bipolar / unipolar control. 1 jumper per every input and output
1x 2 pin jumper for activating / deactivating the offset cv in un-patched input 1
(You can bring these jumpers to front panel with 5x SPDT switches. Not possible in my 4HP panel.)

3x mono jack
1x switching mono jack (for the offset input)

2x OPA2134 IC (if you plan to mix only cv it's a lot cheaper to use 2x TL072 or similar)

Optional:
2x 8 pin IC sockets
1x 2x5 pin or 2x8 pin power cable socket

Building should be very straight forward. There is a couple of tight fits but I have had no trouble to get everything in place. Straight line between two pads means jumpwire.

One important building note: There are two pads marked with "X". Connect these two X-pads with a fly wire.
depth20
Put me down for 2 PCBs thanks!
rosch
i'd like two pcbs also!
rico loverde
id def be interested in 2 as well as 2 panels
brother303
Hi,

two here,please.

applause

Cheers
Greg
theabsent
Ok, I'll do a small run.

Board: 8.50 euros
Panel: 16.00 euros
Both prices include shipping inside the EU.

PM me if interested.
theabsent
I will take orders until July 18th.
theabsent
No more interested wigglers?
Blinkar blÄ
I'll take 2!
theabsent
BOM available in the first post
brother303
Hi,

payment sent for 2x pcb/2x panel.

Cheers
Greg
asb
Hi,

I take 2 PCB's
theabsent
One day notice!
theabsent
Not many hours left...
rico loverde
Was curious if you had an idea when these will ship
brother303
Hi,

rico loverde wrote:
Was curious if you had an idea when these will ship


Same here.

Cheers
Greg
theabsent
Can't give you an exact date because I don't know it but I will send them forward immediately when I receive them. Order was made on July 18th.
brother303
Hi,

theabsent wrote:
Can't give you an exact date because I don't know it but I will send them forward immediately when I receive them. Order was made on July 18th.


Thanks for reply,no problem here! Guinness ftw!

Was just a little curious... oops

Cheers
Greg
theabsent
PCBs are in. I will build one and test it and start the shipping process. Should not take long.
theabsent
PCBs are fine! It was an easy build. Took me under an hour to complete fully. Will start shipping tomorrow.
depth20
Got mine today, looks good. Any news on the xxxk resistor for +15V rail?
theabsent
depth20 wrote:
Any news on the xxxk resistor for +15V rail?


Oh, forgot that. I'll figure it out asap.

edit: check the first post for info
rosch
hi! got mine today! thanks!
regenbot
Built mine. At first forgot to solder a wire from x to x, after a while of hmmm..... realized what was wrong. My first real DIY project is finished This is fun!
theabsent
Second round will be opened in a day or two.
no-fi
getting into the thread so I can get a notification when availability happens.

Will there be any panels this time, too?
theabsent
Old pricing info not relevant anymore
theabsent
4 days to go
BananaPlug
Quote:
Board is approximately 100mm x 45mm in size. Through hole / single sided / silk screened / with solder mask. Board can be panel mounted with 9mm Alpha pots or similar.

What's the spacing between the pots?
What's the distance between center of first pot and edge of PCB?
What's the distance between center of last pot and edge of PCB?
A picture of the board would answer remaining questions.
Thanks.
theabsent
BananaPlug wrote:
What's the spacing between the pots?
What's the distance between center of first pot and edge of PCB?
What's the distance between center of last pot and edge of PCB?
A picture of the board would answer remaining questions.
Thanks.

- ~27mm
- ~6mm
- ~23mm
boothnavy
Payment sent.
theabsent
Closing tonight!
sonicwarrior
theabsent wrote:
Closing tonight!


Stupid question: Jacks and pots are panel mount, right?
Are the jacks easily available?
I guess the pots are these:
http://www.banzaimusic.com/Alpha-9-PC-NUT-100k-lin.html

A picture of the board would be nice indeed to get a feeling what I would get.
theabsent
^ You got the pots right if you want to panel mount the pcb with the potentiometers. You can use what ever B100k pots with fly wires. Jacks are not panel mounted.
sonicwarrior
Payment sent.

Do you already know when you'll get the panels and PCB's?

Edit (3.10.2011): Answering the question myself:

theabsent wrote:
* edit Sep 15th * PCB order made. I took 10 extras. I expect these to be delivered late october.
theabsent
Boards and panels are in and tested. I will start shipping on monday. All should be out at the end of the next week unless otherwise stated here.
theabsent
I have 4 pcbs and 2 panels left.
no-fi
awesome!

looking forward to building up some cool little mixers.
sonicwarrior
Got my stuff today. It's peanut butter jelly time!
LektroiD
theabsent wrote:
I have 4 pcbs and 2 panels left.


I just found this... I'd love a PCB smile
brother303
Hi,

boards and panels are in!

It's peanut butter jelly time!
apemandan
Hi, got mine this morning..thanks! thumbs up
lazerkind
Got mine yesterday, looking good, thanks w00t
barka
mine arrived yesterday, thanks!
regenbot
got mine too few days ago
cillianjohn
mine arrived safe and sound too.
I'll keep the assembly for some dark winter's evening, which Im sure there will be no shortage of in the not so too distant future.
many thanks
mckenic
CRAP!

I looked at this thread 100 times thinking to myself - must ask for some of these... and of course completely forgot!

Any spares? 2pcbs & 2 panels (hides)

Sorry...
sonicwarrior
Can someone please confirm that the Kobiconn 161-MJ153-EX available from Mouser is a suitable 3.5 mm mono switching jack?
diablojoy
boards received today in OZ
thanks
sonicwarrior
sonicwarrior wrote:
Can someone please confirm that the Kobiconn 161-MJ153-EX available from Mouser is a suitable 3.5 mm mono switching jack?


They are. I just bought them.
sonicwarrior
theabsent wrote:
4x 0.1uF (100nF) capacitor (I prefer metal film caps here)


Do you have a reason for that? Aren't they just bypass caps which means you can even use X7R or Z5U ceramics?
theabsent
sonicwarrior wrote:
theabsent wrote:
4x 0.1uF (100nF) capacitor (I prefer metal film caps here)


Do you have a reason for that? Aren't they just bypass caps which means you can even use X7R or Z5U ceramics?


Sorry, I have compeletely missed your question. That is true, just about anything goes. I just use a lot metal film caps.
theabsent
I found three sets of panels and pcb. Anyone interested? 25 euros per set shipped in EU (+8 euros shipped outside the EU).
theabsent
Is there enough interest in third round?
moogah
Watching with interest smile

2-4
Memory_Leak
^^^^
Same here missed 1st, 2nd round hoping for a 3rd thumbs up
Barcode
I'll be down for at least 1 board and panel.
boothnavy
I would buy one more.
Spandex
I'd take a panel + pcb if u did another run.
theabsent
Not too much interest? I'll need 20 verified orders to proceed.
mckenic
Fuggit!

I use mine on EVERYTHING... I'd take 2 more mate!
Dego
I can take a set with panel and pcb
muncky
Pm'd - I'd love a pcb and panel for one of these...
pavementsands
too late to put myself down for a PCB + Panel?

edit - actually 1 of each! not 2 as first posted. Greedy!
revtor
2x PCB's here if you're going ahead with another run


thanks
synaptech
Ooooh I need more mixers, 4 pcbs+panels please!
theabsent
Ok. I'll do a small run of 25 pcbs + 20 panels. First come first served. I will start PMing people in an hour or so.
microfauna
Can I get 3 PCBs?
revtor
paypal sent..
brother303
Hi,

one panel/pcb here,please.

Cheers
Greg
nangu
I'll take 3 panels + pcbs if you haven't sold out yet.

Thanks!!
brother303
Hi,

pament sent!

Guinness ftw!

Cheers
Greg
theabsent
brother303 wrote:
Hi,

pament sent!


Got you pament! Guinness ftw!

Half of the panels are already paid and therefore reserved!
microfauna
PayPal for PCBs x3 sent. Thanks.
marvkaye
Paypal for 2 PCBs sent yesterday.
mckenic
Thanks for this - I find myself using my 3 in EVERY patch! So useful! I had 4 at one stage so I want to up that number smile

Payment sent for 2 PCBs please mate - gonna try my white ABS panel idea!

Dont know the timing issues but I can wait for shipping if the buffered mults are around the same time? Save you a trip to the post office!
theabsent
Last day
theabsent
* update Sep24 2012 * PCBs have arrived. Next I'll do test builds and when confirmed I'll start to ship them out. Everything should be out within a week or so.
Dego
Got mine and built it. Very nice mixer. SlayerBadger!
Zergon
theabsent wrote:

4x 3 pin jumpers for bipolar / unipolar control. 1 jumper per every input and output
1x 2 pin jumper for activating / deactivating the offset cv in un-patched input 1
(You can bring these jumpers to front panel with 5x SPDT switches. Not possible in my 4HP panel.)


Hi!

I'm planning to do thins but I have a n00b question: is there a special connector to put wires from switches to the pins or do I have to solder wires to pins?
theabsent
I don't know any ready made but you can do those yourself. Not sure if that would be any more convenient though.
iL
ups missed this one.

did you got one or two pcbs left.

no need for a panel this time.
theabsent
iL wrote:
did you got one or two pcbs left.


I'm not 100% sure at the moment. PM me and I'll get back to you in a couple of days.
theabsent
All sent!
synaptech
Just arrived to California, cheers! thumbs up
pavementsands
Any suggestions on where to get the 3.5mm switching jack and the 9mm alpha pots in Europe? I can find the pots at banzai, but the only place I can see the 3.5mm switching jack is at mouser - a lot of shipping for a handful of components!
muncky
Think I got mine from MusicDing.de. Spiratronics have the switching jacks if I remember rightly too (they're uk based)

Arrived really quick from Germany to UK. Can be faulted
sonicwarrior
musikding.de

Musik = German for music. 8_)
muncky
Oof! Knew straight away I had probably broken the German language... Dead Banana
sonicwarrior
Normally that wouldn't be a problem, but if someone is trying to open www.musicding.de he will reach nothing (at the moment). wink

So www.musikding.de is the page to go.
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