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 https://shop.re-303.com/)
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:
MOUSER BOM project card: https://www.mouser.at/ProjectManager/ProjectDetail.aspx?AccessID=0324e99177
plus tactiles: 688-SKQEAA
when you use the PIXIE or 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
R39, R40, R41, R44: 3.3k
C12: 0.01uf film
C57: 100uf / 25v electrolytic
|ID||Issue||Issue/Mod Description and fix|
|1||Gate||in case you hear the gate signal - attack clicks - you can try to connect a 100nF polar cap** between GND and Trigger. Measure with an scope to find the best value - maybe you need a bigger value 220-470nf|
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:
FW manual 1.4.3
Firmware Installation (on your own risk)
- turn on and send 303.sysx with sysex librian tool
- turn off and on again
- send the boot loader sysex (1.30 version)
- turn off
- turn on while hold Step1 (all lets flashes like night rider mode)(some older boot loaders don't have the night rider mode)
- now send the REEMU 1.3.0 sysex
- machine restarts byself in 1.3.0 mode
- turn off and on the 303
- send the 303 sysx (optional)
- reload the boot loader 1.4.3 in boot loader mode (hold step1) and upload the REEMU 1.4.3 sysex
Sonicpotions CPU: (deprecated ) pls. use the Pixie CPU
Julian from Sonic Potions developed a CPU for the RE303, this CPU is also an replacement for TB-303
(more here: https://www.sonic-potions.com )
User guide: SonicPotions_Re-303_User_Guide.pdf
Forum about the CPU: http://126.96.36.199/~re303c5/forum/forum/7-re-303-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)
Available in my shop: (shipping starts end of June 2020)
no wobbling potentiometers anymore !!!
you also need for the Midi Jacks an adapter.
you need one of this Stereo Pot: (VR4 in the 303)
VR4 B50K Stereo !! (linear stereo)
VR2, VR7 = 50KB (lin)
VR3, VR5 =50KA (log)
VR6 = 1MA (log)
in total 6 potentiometers
and you need:
pinstripes as shown above in my pictures.
2x 3.5mm (1/8inch) stereo jacks Lumberg KLB-4 which is available worldwide in hundreds of shops - its a quality part.
2x Adapter for the Midi holes to use the 3.5mm jacks - ONLY if you use the RE-303 Aluminum case - this are included with the PCB order in my shop !
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 - optional
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.
DIN JACK Connector with integrated switch
assembled versions are here:
or create your own by 3D print it (SLA)
- Switch: Alps Alpine SPVQ910205
- DIN 5 Jack: Multicomp PSG03463
my own VCF Resonance modification:
the underlined lines are the value which I installed, you should use milled ic pins to make testing and replacement to your favorite sound easier