Eval » Historie » Version 24
Maximilian Seesslen, 30.08.2023 14:46
| 1 | 1 | Maximilian Seesslen | h1. Eval |
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| 3 | CANDis is quite silent. |
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| 4 | |||
| 5 | CANBuz probably will have same issues. Need to test capacitors. |
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| 6 | 6 | Maximilian Seesslen | F=As/V |
| 7 | qalc 0,000022*3 = 0,000066 = 0,066mAs |
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| 8 | Ich hab doch noch grosse |
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| 9 | 12 | Maximilian Seesslen | Is it the power regulator/LDO? What did i solder? |
| 10 | 1 | Maximilian Seesslen | |
| 11 | h2. Parts |
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| 12 | |||
| 13 | 3 | Maximilian Seesslen | * LM386; "DS":https://www.ti.com/lit/ds/symlink/lm386.pdf ; page 10 |
| 14 | 13 | Maximilian Seesslen | * LM4861 M; 1,39€ |
| 15 | ** can be driven @5V; not sure if V+ has to be 3v/2 or 5v/2 ? |
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| 16 | ** Shutdown: power output off on logic high |
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| 17 | |||
| 18 | 14 | Maximilian Seesslen | h2. Amp |
| 19 | 2 | Maximilian Seesslen | |
| 20 | 14 | Maximilian Seesslen | "lm4871":https://www.ti.com/lit/ds/symlink/lm4871.pdf |
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| 22 | 2 | Maximilian Seesslen | h2. MCU |
| 23 | |||
| 24 | 4 | Maximilian Seesslen | * STM32F042G4U6; UFQFPN28; 16KB; hab ich noch 17 |
| 25 | 9 | Maximilian Seesslen | * Get rid of an STM32F072 in order to have DAC? |
| 26 | * STM32G431KBU6 |
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| 27 | 14 | Maximilian Seesslen | ** SAI; FPU |
| 28 | ** 5,87€ |
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| 29 | 15 | Maximilian Seesslen | * STM32F072CBT6 |
| 30 | ** LQFP-48 |
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| 31 | ** 2,40 € |
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| 32 | * STM32F103CBT6 |
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| 33 | ** 2,12 € |
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| 34 | 16 | Maximilian Seesslen | * STM32F303C6U6A |
| 35 | 14 | Maximilian Seesslen | |
| 36 | 5 | Maximilian Seesslen | h2. DAC |
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| 38 | 11 | Maximilian Seesslen | * Maybe later; SAI would be more interesting. DAC for testing DMA. |
| 39 | 7 | Maximilian Seesslen | * 44,100 Hz |
| 40 | * Would require SPI flash for recorded sound |
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| 41 | 8 | Maximilian Seesslen | * Adjustable volume |
| 42 | 1 | Maximilian Seesslen | * Solderbridge for fallback |
| 43 | 24 | Maximilian Seesslen | |
| 44 | h2. Replay |
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| 45 | |||
| 46 | Would need 20KHz; |
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| 47 | have 12 Kbytes RAM; |
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| 48 | 2KB plays 1/20secs |
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| 49 | |||
| 50 | 17 | Maximilian Seesslen | |
| 51 | h2. Flash |
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| 52 | |||
| 53 | DAC-DMA already works for sinewave (copied due to speed). So FLash might be cool for sound samples. |
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| 54 | 18 | Maximilian Seesslen | CD: 44100 samples / sec; |
| 55 | 22 | Maximilian Seesslen | 44100*2*2 = 176'400 Bytes / s; Flash readout has to be a little bit faster for the overhead. |
| 56 | 18 | Maximilian Seesslen | |
| 57 | 19 | Maximilian Seesslen | 1MB would play around 6 seconds. 2MB / 16Mbit would be ok. |
| 58 | 1 | Maximilian Seesslen | 32Mb/4MB available for 1,94€; 100Mhz |
| 59 | 22 | Maximilian Seesslen | STM32F303 has max SPI rate 18Mbits/s or 2,25MB/s |
| 60 | |||
| 61 | 21 | Maximilian Seesslen | h2. USB |
| 62 | |||
| 63 | USB would be nice for writing sound samples to flash. But this might be a nice candidate for writing flash images over CAN. |
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| 64 | Although it might take very long time. |