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M17 (Moduł)/Historia zmian (Changelog)

Z radiowcy.org

Wersja 0.1a

Wstępna wersja prototypu, która nie została zaprojektowana z myślą o łatwości użytkowania. Głównym zadaniem tej wersji jest uruchomienie OpenRTX weryfikacja słuszności koncepcji rozwiązania układowego.

Errata do wersji 0.1a

  • Do not install R23 (1k5 pull-up on USB D+) as the STM32F4 has an integrated pull-up
  • Replace C3 and C6 with 18pF, otherwise Y1 starts too slow during USB DFU
  • Short BOOT0 on pin 94 to PB8 on pin 95 to be able to use SW4 in software
  • The 2.5mm mono jack used for the Kenwood 2-pin speaker mic has the "sleeve" connection where stereo plugs have the "ring". This means that the speaker mic has no GND connection. To fix this, add a bodge wire to the outer shell of the mono jack to GND. Next revisions will use a stereo jack with shorted ring and sleeve connections.

Wersja 0.1b

Naprawa kilku błedów:

  • Changed audio amp from LM386 to LM4861MX
  • Mic amplifier changed from LMV341 to MAX9814 (with an AGC)
  • Fixed Kenwood connector
  • Fixed baseband processing at U6/U7
  • C3/C6 value change from 22 to 18p
  • Changed micro from STM32F407VETx to -405RGTx
  • Added TPS5431 DC/DC converter IC
  • Added MAX3232 and CAT_TX/CAT_RX at DE9 connector

Wersja 0.1c

  • Reduced audio amplifier gain (R3 value change 510k->22k)
  • Fixed RADIO_RX baseband DC bias

Wersja 0.1d

  • Changed supply voltage for U6 and U7 (baseband filter Op-Amps) to 5V and replaced MCP602 with MCP6002 as the former ICs are not rail2rail capable on their input
  • Fixed CAT_TX and CAT_RX solder jumpers
  • Fixed volume knob direction
  • Replaced PSU with in-stock parts
  • Replaced MAX3232 with simple 5V/3.3V level shifters as most, if not all, radios use either 5V or 3.3V TTL instead of RS232
  • Replaced STM32F405RGT6 with GD32F405RGT6 - these ICs are pin and code compatible

Wersja 0.1e

  • Replaced digital potentiometers with multiturn ones to improve parts availability
  • Moved the TX potentiometer from the op-amp's output to between STM32 and the first op-amp
  • Added power-on button
  • Fixed misc BOM errors and removed a few unnecessary components from the schematic

Errata do wersji 0.1e

R31 has too high value. Add a 2.2k resistor across it (in parallel) to increase the sound volume coming from the speaker. Alternatively, replace R31 with a 1.8k or 2k resistor. Resolved.

Wersja 1.0

Moduł rev1.0 i HMI rev0.99b

Przyszłe wersje

Przyszłe wersje będą obejmować co najmniej dodatkowe opcje zasilania i zostaną zaprojektowane z myślą o obudowie.

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