[Closed] Bipolar mixer / offset boards

theabsent · Post by **theabsent** » Mon Jul 11, 2011 5:40 am

* 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:
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 · Post by **depth20** » Mon Jul 11, 2011 8:35 am

Put me down for 2 PCBs thanks!

rosch · Post by **rosch** » Mon Jul 11, 2011 1:37 pm

i'd like two pcbs also!

rico loverde · Post by **rico loverde** » Mon Jul 11, 2011 1:41 pm

id def be interested in 2 as well as 2 panels

brother303 · Post by **brother303** » Mon Jul 11, 2011 3:44 pm

Hi,

two here,please.

Cheers
Greg

theabsent · Post by **theabsent** » Tue Jul 12, 2011 1:19 am

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 · Post by **theabsent** » Wed Jul 13, 2011 9:38 am

I will take orders until July 18th.

theabsent · Post by **theabsent** » Thu Jul 14, 2011 3:51 pm

No more interested wigglers?

Blinkar blå · Post by **Blinkar blå** » Thu Jul 14, 2011 4:26 pm

I'll take 2!

theabsent · Post by **theabsent** » Fri Jul 15, 2011 6:47 am

BOM available in the first post

brother303 · Post by **brother303** » Fri Jul 15, 2011 9:30 am

Hi,

payment sent for 2x pcb/2x panel.

Cheers
Greg

asb · Post by **asb** » Sat Jul 16, 2011 12:00 pm

Hi,

I take 2 PCB's

theabsent · Post by **theabsent** » Sun Jul 17, 2011 2:02 pm

One day notice!

theabsent · Post by **theabsent** » Mon Jul 18, 2011 9:12 am

Not many hours left...

rico loverde · Post by **rico loverde** » Tue Jul 26, 2011 11:17 pm

Was curious if you had an idea when these will ship

brother303 · Post by **brother303** » Wed Jul 27, 2011 1:07 pm

Hi,

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

Same here.

Cheers
Greg

theabsent · Post by **theabsent** » Wed Jul 27, 2011 1:51 pm

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 · Post by **brother303** » Thu Jul 28, 2011 1:57 pm

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!

Was just a little curious...

Cheers
Greg

theabsent · Post by **theabsent** » Thu Aug 11, 2011 5:40 am

PCBs are in. I will build one and test it and start the shipping process. Should not take long.

theabsent · Post by **theabsent** » Thu Aug 11, 2011 7:08 am

PCBs are fine! It was an easy build. Took me under an hour to complete fully. Will start shipping tomorrow.

depth20 · Post by **depth20** » Thu Aug 18, 2011 11:32 am

Got mine today, looks good. Any news on the xxxk resistor for +15V rail?

theabsent · Post by **theabsent** » Thu Aug 18, 2011 12:11 pm

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 · Post by **rosch** » Wed Aug 24, 2011 3:51 am

hi! got mine today! thanks!

regenbot · Post by **regenbot** » Thu Aug 25, 2011 12:19 am

Built mine. At first forgot to solder a wire from x to x, after a while of

realized what was wrong. My first real DIY project is finished

theabsent · Post by **theabsent** » Sat Sep 03, 2011 9:53 am

Second round will be opened in a day or two.

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[Closed] Bipolar mixer / offset boards

[Closed] Bipolar mixer / offset boards