From 60eafffd3ec81e8b2dceb517c4c988663cdb64c4 Mon Sep 17 00:00:00 2001 From: euquiq <31453004+euquiq@users.noreply.github.com> Date: Fri, 19 Jun 2020 11:43:36 -0300 Subject: [PATCH] Updated Differences Between H1 and H2 models (markdown) --- Differences-Between-H1-and-H2-models.md | 20 ++++++++++++++------ 1 file changed, 14 insertions(+), 6 deletions(-) diff --git a/Differences-Between-H1-and-H2-models.md b/Differences-Between-H1-and-H2-models.md index e416922..a850f58 100644 --- a/Differences-Between-H1-and-H2-models.md +++ b/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 180ยบ 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. \ No newline at end of file