A tiny, modern reimagining of the classic Gotek floppy-disk-drive emulator. Nano-Tek keeps the full feature set of a Gotek-style FDD emulator but packs it onto a board that is a fraction of the size, hence the name Nano-Tek.
The schematic is derived from the open-source OpenFlops design by SukkoPera, re-laid-out on a compact 4-layer PCB.
- A lot smaller. The board measures just 51 × 42 mm, roughly half the footprint of a standard Gotek, while keeping the same 34-pin floppy interface.
- FlashFloppy-compatible. Built around the STM32F105RBT6 (Cortex-M3) MCU, so it runs the popular FlashFloppy firmware.
- USB-C. A modern USB-C port for the USB stick, fed through a current-limited power switch. It can also power the board on the bench.
- OLED + rotary encoder headers for a clean front-panel UI.
- On-board passive buzzer for the drive-step "click" and FlashFloppy's notification beeps.
- Easy first flash. Serial (with a BOOT0 jumper) and SWD headers on board, so a blank chip can be programmed without extra wiring.
- 4-layer PCB for clean power and signal routing in a small area.
| Function | Part / Connector | Ref |
|---|---|---|
| Microcontroller | STM32F105RBT6 (LQFP-64) | U1 |
| Bus buffer | 74LCX07 (TSSOP-14) | U2 |
| 3.3 V regulator | AP2112K-3.3 (SOT-23-5) | U3 |
| USB power switch | SY6288DAAC, current-limited (SOT-23-5) | U4 |
| USB bench power | B5819W Schottky diode (USB-C to +5 V) | D2 |
| Clock | 8 MHz crystal | X1 |
| Floppy interface | 34-pin IDC header | CN3 |
| Power input | 4-pin power connector (171826-4) | CN1 |
| USB | USB-C (SMD) | CN2 |
| Display | OLED header (I²C) | J3 |
| Input + debug | Rotary encoder + SWD header (1×8) | J4 |
| Programming | Serial + BOOT0 header (2×5) | J2 |
| Audio | Passive buzzer, 9 mm (QMB-09B-05) | J1 |
See Nano-Tek.pdf for the full schematic and jlcpcb/production_files/BOM-Nano-Tek.csv for the complete bill of materials.
Nano-Tek.kicad_pro KiCad 10 project
Nano-Tek.kicad_sch Schematic
Nano-Tek.kicad_pcb PCB layout (4-layer)
Nano-Tek.pretty/ Project-specific footprint library
3dmodels/ 3D models for connectors/parts
docs/ Builder's guide, ST-LINK/V2 label
docs/images/ Rendered board images
jlcpcb/ Gerbers, BOM and CPL for JLCPCB assembly
Nano-Tek.pdf Schematic export
Ready-to-order production files for JLCPCB (4-layer) are provided in
jlcpcb/production_files/:
GERBER-Nano-Tek.zip: Gerber + drill filesBOM-Nano-Tek.csv: bill of materials (with LCSC part numbers)CPL-Nano-Tek.csv: component placement / pick-and-place
A new board needs its first FlashFloppy flash over serial (J2, BOOT0 jumper on pins 9–10) or SWD (J4, ST-Link). USB-C (DFU) does not work on a blank chip; it is only for recovery once FlashFloppy is on the board. Download the release zip from the FlashFloppy releases page and use hex/flashfloppy-at415-st105-<ver>.hex from it.
Step-by-step wiring for USB-serial adapters, PL2303 cables, ST-Link clones and the official ST-LINK/V2 is in the builder's guide. After the first flash, update from a USB stick: copy the .upd file to the stick and hold the encoder button at power-on.
Note: The USB-C port is a host port. Use a USB-A to USB-C data cable to power the board from a PC; USB-C to USB-C cables don't power it.
- Rev 1.3 (October 2026): on-board passive buzzer, USB power switch, J2 serial pins now match the silkscreen, PA9/PA10/PA3 pull-ups, /MOTOR on PA15, NRST on J4 pin 8.
- Rev 1.0–1.2: J2 TX/RX are swapped against the silkscreen, and D1 must be fitted across the speaker (not in series) for sound. The builder's guide marks the steps that differ.
- Schematic derived from OpenFlops by SukkoPera.
- Firmware: FlashFloppy by Keir Fraser.
- Thanks to Vinny, Mesarim, Screemo, Kavanoz, Wrangler and Ordyne.
Please check the upstream OpenFlops project for its licensing terms; this derivative is shared in the same open-hardware spirit.
Nano-Tek: the Gotek, shrunk. Rev 1.3.