TheArchive/mayhem-firmware
1
0
Fork 0
mirror of https://github.com/portapack-mayhem/mayhem-firmware.git synced 2024-11-23 18:15:34 +00:00
Code Issues Packages Projects Releases Wiki Activity

Updated Differences Between H1 and H2 models (markdown)

euquiq 2020-06-19 11:25:23 -03:00
parent 546e8a21f7
commit ea74731b86
1 changed files with 20 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

19
Differences-Between-H1-and-H2-models.md

@ -1,3 +1,15 @@
Portapack H1 hardware represents the original design, which is well documented, placed in the public domain.
Portapack H2 hardware is a custom modification of the original design, made by unknown fans (which at this time are keeping their design notes / documents for themselves) including some upgrades:
* Bigger screen
* Different navigation buttons
* internal battery
* battery charging circuitry
* better internal Speaker integration
Note: _There is also an hybrid H1 / H2 model, called the 2020 H1 Model, which is an H1 but with a bigger screen._
# Audio
At a glance, hardware-side, both models feature a **headphone connector** and the same **AK4951 AUDIO / CODEC IC** (You can get the datasheet [following this link](https://www.akm.com/content/dam/documents/products/audio/audio-codec/ak4951aen/ak4951aen-en-datasheet.pdf)).
@ -16,9 +28,16 @@ The **AK4951 IC** is rotated 180º and placed more into the middle of the circui
The speaker audio header is switched on/off by the headphone female connector, which includes the usual switch, detecting the insertion of a male plug in it.
## Audio in H1 model
Only the soldering pads for an internal speaker connector header are present. The speaker +/GND signals on the pad are routed directly into AK4951 pins.
**NOTE:** _There is no extra amplifier IC between the speaker pad and the AK4951. The AK4951 includes a speaker amplifier capable of 1W, when powered @5v._
You can solder a laptop / tablet speaker in H1 speaker pads. In order to enable it, you will need to install MAYHEM firmware, where you can also configure under **OPTIONS -> INTERFACE** the addition of a SPEAKER button on your top status bar.
### Audio devil is in the Details
Since the firmware is shared between H1 and H2, on Portapack H2 you end up powering up TWO speaker amplifiers: The one inside AK4951 IC, and the extra CS8122S one.