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)).
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@@ -14,7 +26,8 @@ Portapack H2 circuitboard includes a connector header for easily adding an inter
The **AK4951 IC** is rotated 180º and placed more into the middle of the circuit board, allowing for the addition of an extra IC: The ChipStar brand **CS8122S** ultra-low EMI, filter-free, class-D amplifier, for driving the speaker output with up to 3W.
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.
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
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**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.
