Mutron Biphase Clone - Fabric Astronaut

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home_listening
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Mutron Biphase Clone - Fabric Astronaut

Post by home_listening » Fri Jan 11, 2019 12:55 pm

Wanted one ever since I was a teenager and shaved my head to look more like Billy Corgan and watched Vieuphoria over and over and over...

... though I'll admit its Lee Scratch Perry who has maintained my interest in it in the following decade and a bit.

I don't like wires. This has no wires. The unit is comprised of 3 main PCBs, an I/O plus power supply PCB, a modulation generator PCB and finally an audio PCB. The two footswitches have small breakout boards. Each PCB is linked together by 3 IDC ribbon cables.

Its designed to be dropped into a Hammond 515-0920 enclosure so the overall dimensions are 150mm x 150mm, the case slopes from roughly 55mm at the back to 30mm at the front . I'm going to drill out my prototype enclosure by hand, but if there is interest I suppose I will chat to Hammond about getting the enclosures punched and silkscreened for the project and assess whether it is reasonable financially. Panel design is upcoming, but I can say for damn sure it won't have anything to do with the original. My last project looked like https://fabricastronautblog.wordpress.c ... ynth-pt-4/, so probably a good jumping off point for this one. Front panel components are spaced on a 1" grid (a la Serge, my format of choice).

Its a direct clone of the original with only small changes for practicality. Differences are:

-Internal LM317/LM337 based power supply using an AC plugpack - no mains wiring.
-Effect bypass is achieved using relays rather than the opto based system in the original.
-The rotary switches are On-On-On toggle switches, no difference in functionality they are just smaller.
-Expression pedal input has a 5V source for pedals which is internally jumperable to just accept a basic 0-5V CV input without putting the 5V out on the ring.
-External footswitches in the original have been built in.

At this stage I've ordered the boards and will build and test once they arrive. Here are some of the docs I've assembled so far and a few renders for salivation.

Not much in the BOM you can't buy from mouser other than the LDR which I'm looking into. I have a lead on some appropriate looking units locally and will be able to purchase a large stock and include them if they are spot on.

I have a small light shield that will be 3D printed for isolation between the two channels.

If all goes well I'm planning to sell boards for this. No idea on cost, no idea on time.

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Last edited by home_listening on Fri Jan 11, 2019 2:51 pm, edited 4 times in total.

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Post by home_listening » Fri Jan 11, 2019 1:16 pm

--Reserved--

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Kent
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Post by Kent » Fri Jan 11, 2019 1:22 pm

Sweet! Looks nice. Such a labor of love.

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Reality Checkpoint
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Post by Reality Checkpoint » Fri Jan 11, 2019 1:25 pm

Very interesting. I shall be watching this project.

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a100user
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Post by a100user » Fri Jan 11, 2019 1:48 pm

Reality Checkpoint wrote:Very interesting. I shall be watching this project.
Me too.

The other bi-phase thread is also interesting but this appears slicker to me so far.
I'm looking for nothing at this moment in time

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Post by realitycontrol » Fri Jan 11, 2019 1:52 pm

You got a big YES from me!

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Post by devinw1 » Fri Jan 11, 2019 1:56 pm

Very cool!

BTW your finished monosynth looks bitchin'. ! :sb:

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Post by synthpriest » Fri Jan 11, 2019 2:00 pm

Following closely. In love with the Mu-tron Bi-phase sound.

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Post by Yellow » Fri Jan 11, 2019 2:07 pm

:tu:

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Post by aabbcc » Fri Jan 11, 2019 2:37 pm

Yes, do want this!

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Post by jersupereq » Fri Jan 11, 2019 4:06 pm

Yes Please!!! :yay:

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cackland
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Post by cackland » Fri Jan 11, 2019 4:06 pm

Looks great. What software did you design this in?

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Post by Branko » Fri Jan 11, 2019 4:23 pm

Incredible work! I'll grab a pcb set when it is available!

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Post by diophantine » Fri Jan 11, 2019 7:08 pm

Looks fantastic! I'm definitely interested & look forward to seeing where this goes...

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Post by tobb » Fri Jan 11, 2019 8:01 pm

WOW :tu:

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Post by home_listening » Fri Jan 11, 2019 9:31 pm

cackland wrote:Looks great. What software did you design this in?
Fusion 360, the enclosure model is simply from Hammond's website and most of models of pots/switches were up on grabcad.com

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Post by home_listening » Fri Jan 11, 2019 9:56 pm

devinw1 wrote:Very cool!

BTW your finished monosynth looks bitchin'. ! :sb:
Thanks! So is yours!

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Post by sempervirent » Sat Jan 12, 2019 3:18 pm

That is one dense board. Enclosure renderings look great. Subscribing to the thread for updates.

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Post by makhho » Sat Jan 12, 2019 4:20 pm

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Last edited by makhho on Tue Aug 25, 2020 2:23 pm, edited 1 time in total.

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Post by fragletrollet » Sat Jan 12, 2019 5:35 pm

Cool!

One of the first diy-projects I built was a quad biphase using pcb`s from this site:

http://m.bareille.free.fr/biphase/biphase.htm

Turned out to be a bit of an undertaking for a newb, the pcb`s being without silkscreen and all instructions in french :lol:


Well, I learned french, and own a fully working quadriphase :bananaguitar:

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Post by Ayab » Sun Jan 13, 2019 6:53 am

The bi-phase was on the Kraftwerk kit list - Would this be the phasing sound they used on their drums especially to give that always retriggering the phaser cycle at the place with each hit effect?

Great project, I am feeling extremely tempted!

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Post by home_listening » Sun Jan 27, 2019 7:01 am

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Reality Checkpoint
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Post by Reality Checkpoint » Sun Jan 27, 2019 7:56 am

It's alive!!!!

Wonderful stuff.

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Post by aabbcc » Sun Jan 27, 2019 8:19 am

Wow :hail:

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Post by tobb » Sun Jan 27, 2019 8:56 am

nice!

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