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Updated Differences Between H1 and H2 models (markdown)

euquiq 2020-06-19 11:43:36 -03:00
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Differences-Between-H1-and-H2-models.md

@ -21,23 +21,31 @@ The AK4951 includes separate pins for speaker and headphone output:
Upon close inspection, several differences arise:
## Audio in H2 model
## H2 Portapack audio
Portapack H2 circuitboard includes a connector header for easily adding an internal speaker.
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
## H1 Portapack audio
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.
**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
### "Audio devil may be 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.
# Power Supply
## H1 Portapack
H1 Portapack design does NOT include any battery charging circuit, nor a provision for a power on/off switch.
Having said that, some enthusiasts managed to MOD their H1's by adding a standard usb powerbank management circuit board with the corresponding Li-ion battery and placing a manual power switch on their cases.
## H2 Portapack internal battery
H2 includes an internal Li-Ion battery, standard battery charging / managment IC (located at the side of the speakerphone connector) and power switch.