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Maximilian Seesslen, 30.08.2023 15:24
Eval¶
CANDis is quite silent.
CANBuz probably will have same issues. Need to test capacitors.
F=As/V
qalc 0,000022*3 = 0,000066 = 0,066mAs
Ich hab doch noch grosse
Is it the power regulator/LDO? What did i solder?
Parts¶
- LM386; DS ; page 10
- LM4861 M; 1,39€
- can be driven @5V; not sure if V+ has to be 3v/2 or 5v/2 ?
- Shutdown: power output off on logic high
Amp¶
MCU¶
- STM32F042G4U6; UFQFPN28; 16KB; hab ich noch 17
- Get rid of an STM32F072 in order to have DAC?
- STM32G431KBU6
- SAI; FPU
- 5,87€
- STM32F072CBT6
- LQFP-48
- 2,40 €
- STM32F103CBT6
- 2,12 €
- STM32F303C6U6A
DAC¶
- Maybe later; SAI would be more interesting. DAC for testing DMA.
- 44,100 Hz
- Would require SPI flash for recorded sound
- Adjustable volume
- Solderbridge for fallback
Replay¶
Would need 20KHz;
have 12 Kbytes RAM;
2KB plays 1/20secs
Stereo gets tricky. There is only 1 SPI. Would need to couple DAC outputs. Maybe test this later.
Flash¶
DAC-DMA already works for sinewave (copied due to speed). So FLash might be cool for sound samples.
CD: 44100 samples / sec;
44100*2*2 = 176'400 Bytes / s; Flash readout has to be a little bit faster for the overhead.
1MB would play around 6 seconds. 2MB / 16Mbit would be ok.
32Mb/4MB available for 1,94€; 100Mhz
STM32F303 has max SPI rate 18Mbits/s or 2,25MB/s wide range voltage; 24Mb/s or 3MBytes/s normal range
MX25L3233FM1I-08G is 83 cents; supports QIO
Irgendwas muesstte ich eh noch haben, hab mal groesser eingekauft.
USB¶
USB would be nice for writing sound samples to flash. But this might be a nice candidate for writing flash images over CAN.
Although it might take very long time.
Von Maximilian Seesslen vor mehr als 1 Jahr aktualisiert · 30 Revisionen