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Projecttitel: DINSYNC RE-303

Status:  DONE

Startdate: 2016

Duedate: 09/2018

Manufacture link:

Forum :

Page Content:

its not a clone, its a replica of the famous Roland TB-303

The Founder Paul Barker developed in 2016 the RE-303.

the "internal Name" is Space Cadet.

few different case types are avaiable/fits with the pcbs: TT-303 (old version),

you find a german article from me, about the RE-303 here:


The PCB set contains:  (available on

RE-303 v1.2 main-board and switch-board PCB.

Sumida coil and adapter.

3pc set of power transistors.

8pc set of potentiometers (tune, cutoff, resonance, env, decay, accent, tempo and volume with switch)

2pc set of rotary switches (pattern/mode)

3pc set of 6.3mm jacks (mix in, headphone, main out)

2pc set of 3.5mm jacks (cv/gate)

1pc DC jack

1pc waveform switch

Parts what you have to source:

the following files are based on the same version but with different office formats:

RE-303 BOM_1.2_official.pdf

RE-303 BOM_1.2_official.xlsx

RE-303 BOM_1.2_official.ods

MOUSER BOM project card:

when you use the Sonic Potions CPU you dont need following parts

ift(y): yellow coil for the original cpu clock
ic2: cd4556B decoder/multiplexer
ic3, ic4, ic5: cmos ram
D4: 1n4148
R6: 33k
R7: 100k 
R23: 22k 
R39, R40, R41, R44: 3.3k
C12: 0.01uf film 

C57: 100uf / 25v electrolytic
Q4: 2sc536f/2sc945p 

Pixie CPU (the better Version) 


"The Pixiepowered RE-CPU is a D650C emulator, which will allow you to run original maskrom firmware from original Roland(tm) machines."

Firmware and more:

Sonicpotions CPU:  (avaiable from RE-303 shop and direct from Julians shop). 

Julian from Sonic Potions developed a CPU for the RE303, this CPU is also an replacement for TB-303

(more here: )

User guide: SonicPotions_Re-303_User_Guide.pdf

Installation guide:SonicPotions_Re-303_Installation_Guide.pdf

Forum about the CPU:


different cases are on the market:

Alu case in black, silver, white, gold..

Buildguide for the case:



you can also use a Bassbot TT-303 case (the first 303 style case)

Buildguide v1.2


Case Assembly guide


Potentiometer Modification:


no wobbling potentiometers anymore !!! 

ask me if you need/want this solution, i left some pcbs..

you also need for the Midi Jacks an adapter.

update 01/2020: ground the MIDI IN port too, that's needed because the acrylic's adapter to the stereo 3.5mm jacks are isolated

in case you use silver knobs: they are metalized and make grounding issues, you have to remove from the bottom the paint with a cutter knife.(easy)

the blue cable connects ground from MIDI out to the MIDI IN jack.


Battery Tray

You will need 5x 1.2V AA batteries, get the ones from IKEA, they're from the same factory as the Eneloop ones but for a fraction of the cost.

Unless you can find a 5x AA battery tray best bet is to 3d print your own.

Then follow the official guide for installing the battery tray.

It is important to fit a 10 Ohm resistor as in this photo.


Random pics: