Table of Contents
STELLAx4
4x 8Bit Soundchips/TIAś on a 10x10cm PCB,
controlled from a STM32F4 Microcontroller dipcoref4,
based on Antichambreś TIA Module, with AD9833ś as External programmable Clock, the Frequency-range is expandet…
The Board acts a Motherboard, for
- 4x Soundchip… AND:
also like the stm32f4_module it provides:
- Midi-IO - 1x IN, 1x OUT > 3,5Jacks/TRS
- µSD-Card - 2 Save Patches
- J19>AoutNG - to connect VCF or VCAs…
- J15 (JLCD1) which handle from Stock 4x SPI-Displays (SSD1306), - 4 the UI
- J1>chain a nother STELLAx4 as “SLAVE” to it, to expand polyphony
ready for Pick and Place
–all SMD-Parts are on one SIDE and are presoldered..
Features
* Summed or Individual Audio-Outs, selectable via normal Jumpers
* NTSC or PAL > select via SMD-Solder-Jumper
* User-Interface is C-Language-Programmable
Hardware Requirements
- 4 x TIA/STELLA [PAL or NTSC…)
- Soldering Iron - with a Dip that can Handle Thruhole-Parts, solder Paste…
- 5V from Mini-USB-Plug, or 5V at a 2Pin-Header connected to example a Eurorack Power Source (+5VDC!)
- dont forget Midi TRS Cables
Shematic
Rev.A
stellax4-shematic.pdf
Rev.B
stellax4-shematic-b.pdf
Building
The Design is optimized for Pick and Place > all SMD Parts are on the Top-PCB
The Rest is Thruhole > easy
Rev.A
Rev.B
BOM LCSC
these are the parts which are presoldered by the Pick and Place Machine
| Comment | Designator | Footprint | LCSC Part Number | Library Type |
|---|---|---|---|---|
| 100K | Ra3,Rb3,Rc3,Rd3,Ra4,Rb4,Rc4,Rd4 | midibox:0805-R | C17407 | basic |
| 100nF | Ca1,Cb1,Cc1,Cs1,Cd1,Ci1,CJi1,Ca2,Cb2,Cc2,C2,Cd2,Ci2,CJi2,Ca3,Cb3,Cc3,Cd3,Ci3,Cpa3,Cp3,Ca4,Cb4,Cc4,Cd4,Cu4,Ci4,Ca5,Cb5,Cc5,Cd5,Ca6,Cb6,Cc6,Cd6 | midibox:0805-C | C49678 | basic |
| 10uF | Ca8,Cb8,Cc8,Cd8 | midibox:1206-C | C13585 | basic |
| 1K | R5 | midibox:1206-R | C4410 | basic |
| 1K8 | Ra1,Rb1,Rc1,Rd1,Ra2,Rb2,Rc2,Rd2 | midibox:0805-R | C17398 | basic |
| 1N4148W | D1 | midibox:SOD123-DIODE | C81598 | basic |
| 220 | R1,R2,R3 | midibox:0805-R | C17557 | basic |
| 47uF | Cpa1,Cp1,Cpa2,Cp2,Ca7,Cb7,Cc7,Cd7 | midibox:1206-C | C96123 | basic |
| 4K7 | R4 | midibox:1206-R | C17936 | basic |
| 74HC2G32 | IC1,IC2,IC3,IC4 | SOIC:VSSOP-8_2.3x2mm_P0.5mm | C91874 | extendet |
| 74HC541-TSSOP | U4 | midibox:74HC541-TSSOP20 | C406865 | extendet |
| 74HC595 | Sa1,Sb1,Sc1,Sd1,S1,Sa2,Sb2,Sc2,Sd2 | midibox:SOP-16_SOIC-16 | C5947 | basic |
| AD9833BRMZ | NCO1,NCO2,NCO3,NCO4 | midibox:MSOP-10_3x3mm_P0.5mm | C9652 | extendet |
| PTC | PTC1 | midibox:1206-R | C126818 | extended |
BOM Mouser
ca. <30€ exlc shipping > so better order other stuff too, over 50€ there is free shipping!
Parts for Handsolder:copy list below, and paste in this link
| Comment | Designator | Mouser Part Nr |
|---|
647-UKW1H100MDD|8
490-SJ1-3535NG-GR|3
512-6N138M|1
575-1104730841001000|1
200-CES12001TS|3
649-68000-220HLF|1
151-8010-E|12
649-68000-220HLF|1
571-1-2178710-0|5
732-5032CC25.0HJGA3|1
649-68000-220HLF|1
575-1104764041001000|4
798-DM3AT-SF-PEJM5|1
for prototyping i ordered:
490-SJ1-3535NG-GR instead of 490-SJ1-3535NG because it is out of stock - so GREEN sockets for now!
Cable-Connectors for UserInterface and AOUT-Module you will need also:
571-1-2178712-0|8
+ Ribbon Cables for example:
710-63911015521CAB|1
| Comment | Designator | Mouser Part Nr | |
|---|---|---|---|
| 10uF-Audio | Ca9Cb9Cc9Cd9Ca10Cb10Cc10Cd10 | 647-UFG1H100MDM | 8 |
| 3.5Jack | Midi-I-1Midi-O-1Audio-Out1 | 490-SJ1-3535NG | 3 |
| 6N138 | U2 | 512-6N138M & 575-1104730841001000 | 1 |
| DIPCOREF4_52P | U1 | 200-CES12001TS | 3 |
| Header-1×2-JUMPER | SumA-SumD2SumB2RailD2RailA2 | 649-68000-220HLF + 151-8010-E | 12 |
| Header-1×3 | AUDIO1SUMMED1AUDIO2AUDIO3AUDIO4 | 649-68000-220HLF | 1 |
| Header-2×5-Micromatch | JLCD1,Jo1,Ji1,J19,J89 | 571-1-2178710-0 | 5 |
| Oscillator-5032u7050 | OSC1 | 732-5032CC25.0HJGA3 | 1 |
| PinHead-1×2 | JBOOT1AIN1J18 | 649-68000-220HLF | 1 |
| TIA | TIA1TIA2TIA3TIA4 | 575-1104764041001000 | 4 |
| uSD_DM3ATDM3AT | U3 | 798-DM3AT-SF-PEJM5 | 1 |
PART Locations
To Do
save money for Rev.B - Prototype
UI-PCBs
Community users working on it
- Phatline = PCB & Shematic, UI-Programming, Documentation…
- antichambre = Shematic, Porting 8>32Bit, Programming…
Just let a Private message on the forum to user already involved.
Community users interested on it
- sajtron = Chip composer who maybe wanna buy one…