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. Pic of the board with the chip removed (notice the small damaged trace from not enough heat and me being too aggressive.įinal pic with the TPA3156D2 installed (before applying new heatsink compound along with heatsink) Pic of the original TPA3116D2 (heat sink removed) and then use a good bit of flux when soldering, to help prevent bridges! You definitely want to use a good amount of flux to clean up the pads after the chip removal (ie flux and copper braid). ** note: the increase may even be much more than that, I realized I didn't even have my bluetooth source volume pushed up. I did a quick test with a DB meter on my phone, about 6 inches away from the speakers, running a few acoustic songs, and then did the same test with the upgrade, looks like at least a 5db increase at least at full volume, seems good to me! You can get the TPA3156D2 for about $4-5 or so, I just bought a pack of 5 from mouser. I was at about 325C, and it wasn't quite enough, I ended up damaging a small trace being a bit too aggressive and i didn't get enough solder good and melted. You do need a decent hot air station (or something similar) in order to heat the chip up enough to remove it, and because there's a good amount of GND connections to the chip and gnd planes under it, you really need to heat it up high. (highest upgrade that seems available as a drop-in replacement) it's a drop-in replacement, just has 20W more power with the same exact specs. So the TPA3116D2 is rated at 50W into 4ohms, and in that same family of amp chips is the TPA3156D2, which is 70W into 4 ohm. It's been quite a while since I checked in on this project, but realized there was a super cheap upgrade that is almost a 'why not' for anyone with decent soldering tools! There is a thread started on "DIY AUDIO" that is referencing a possible speaker mod, may be a great place to join the discussion.Īlso facebook groups for the 'spark owners' as well as 'spark mod group' for actual mod discussions: Speakers: PSP00471001 G3 120231 - Custom made speaker for PG? Op-Amps: NJM2740 - dual low saturation output operational amplifier featuring low noise of 6.5nV/√Hz SRAM: IS66WVE1M16EBLL - 16Mb (2MB) Async/Page PSRAMĪmp : TPA3116D2 - 2x50W Class-D Stereo AmpĭSP: AK7755 - DSP with Mono ADC Stereo CODEC + Mic/Lineout AmpĭAC: ES9023 - 24-bit stereo audio DAC with an integrated 2Vrms op-amp driver The front grille is also formed with MDF, with the fabric covering stapled on, and velcro straps used to make it removable from the main housing.įlash: FM25Q08A - 8M-BIT (1MB) SERIAL FLASH MEMORY THIS page will ALSO be used to tracking and discussing any mods we/the community can come up with to make this amp better or just add more features!Ĭonstruction: The amp is main built using MDF (medium-density fibre board), which is epoxied together to create the main housing. THIS page will be dedicated to the teardown of the amp, and showing pictures and describing individual components of the amp, as much as can be identified.
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