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Goal
At first sight
The schematic
The power supply
The microcontroler
The synthesiser
The ROMs
Code and memory maps
AVR cartridge
CPLD cartridge
Converting sounds
Creating the ROM
PCBs
The PCB3d render

Simulation I routed a custom PCB which can be stuffed inside the S&S for embedded operation (but not inside the cartridge slot, which is way too small).

The PCB can be ordered on BatchPCB for $7.50.

Here are the manufacturing files: Layout for Proteus 7.2 and in 200 DPI PNGs.

The schematic is the one shown on this page.

(Real PCB pictures to come... )

 

 

Bill of materials:

  • U1: 16 or 32kB Flash or (E)EPROM 16ko. 27C/29W128/256 in DIP28 (eBay), between $2 and $4
  • U2: EPM3064ATC44 CPLD Farnell 1549417 3.08€
  • U5: 1117CE33 3.3V LDO regulator Farnell 2057285 0.31€
  • U4: L78L05ACZ 5V regulator Farnell1467763 0.124€
  • U3: CD4093BM NAND with Schmitt trigger inputs Farnell 0.35€ (or MC74VHC1G14 in SOT353 Farnell 1353868 0.087€)
  • Q1: BC817 transistor Farnell 2114873 0.025€
  • C1: 10uF electrolytic capacitor 2.54mm
  • C2, C3: 100nF capacitor 1206
  • R1,R3,R5,R7,R9,R11,R13: 68k 1206
  • R2,R4,R6,R8,R10,R12,R14: 27k 1206
  • R15: 150 1206
  • R16: 2.2k 1206
  • R17: 10k 1206

The final cost is around $18 without shipping, and without the CPLD and flash programmer.

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