Hardware » CANBuz

h1. 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?

h2. Parts

* LM386; "DS":https://www.ti.com/lit/ds/symlink/lm386.pdf ; 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

h2. Amp

"lm4871":https://www.ti.com/lit/ds/symlink/lm4871.pdf

h2. 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

h2. 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

h2. 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;

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