![]() ![]() So they may have found it easier to just hang a serial flash off of one of the SPI/I2c interfaces on this chip, as the STM32 family has plenty of these. You can actually use the processor's 'flash program area' to also store things that the program can use (ie like the profiles), but you also have to be careful to not overwrite this when updating the firmware itself. maybe the 4 profiles on the amp, not entirely sure. Not sure what exactly they are storing in here. Underneath the processor module on the main board is not much at all, some passive components, and one IC, the FM25Q08A 'Serial 8Mbit (1MB) Flash'. On the underside of the processor module is the ISSI 16Mbit (2MB) SRAM, added on for extra external SRAM to the CPU, since the STM32F4 really doesn't have much internal SRAM. 050" (1.27mm) M/F headers for the ease of removing the module from the main PCB. The processor is mounted on a 'removable' pcb module, using standard. The Spark 40 uses the STM32F427 as the main CPU of this amp. Shouldn't be too hard to find some car audio 2-way coaxials that have a 3.75" (or smaller) cutout size, as long as the mounting area is larger than the 3.75" hole so we can mount them! The 'cutout' holes are 3.75" diameter, and the mounting area for the speaker 'flange' is around 4 1/8", a little more in the areas where the corners/screw holes are because of the odd shaped mounting flange. So really we will just have to test it out unless we can identify filters on the PCB. I did check out the PLIMIT SETUP, there is NO resistor divider setup, they had the footprints there if they wanted to drop the output power, but currently PLIMIT is tied directly to GVDD, so indeed this AMP is setup as full power, 50W x 2. (ie 40W max versus 50W full power of this chip). My guess is that these speakers are rated at 40W, which is why it appears the TPA31162 amp chip (PLIMIT pin 6) is setup with a value, to limit the max output power. The amp is stereo (2x 50W), so each 4 Ohm speaker is connected to one channel of the 2 channel amp. spectrum to the AMP section anyhow, they may have a low-pass filter setup somewhere along the circuit to cut all mids and highs out. I honestly don't know if they are passing the full freq. considering this IS also a 'bluetooth' speaker you can play your own music on, would be nice to add a couple two-way coaxial speakers, commonly found in the car-audio realm. The two woofer/driver speakers are one-way speakers (ie no mids or tweets), which is pretty much the usual with a guitar amp anyhow, since the lows to mids are the usual frequences we worry about in the guitar amp world.īut.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |