From 6ed8cb4f928b45fc93fa09ff98f9774934af9ae3 Mon Sep 17 00:00:00 2001 From: Erwin Ried <1091420+eried@users.noreply.github.com> Date: Sat, 20 Jun 2020 00:49:50 +0200 Subject: [PATCH] simplifying a bit the text so it is faster to read, I hope it is ok (I think there is still a bit too much superfluous text :) but I know that we use to add a lot in spanish itself) --- Differences-Between-H1-and-H2-models.md | 40 ++++++++++++------------- 1 file changed, 19 insertions(+), 21 deletions(-) diff --git a/Differences-Between-H1-and-H2-models.md b/Differences-Between-H1-and-H2-models.md index 58e975c..ef53642 100644 --- a/Differences-Between-H1-and-H2-models.md +++ b/Differences-Between-H1-and-H2-models.md @@ -1,6 +1,4 @@ -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: +The H1 is the [original](https://github.com/eried/portapack-mayhem/tree/master/hardware/portapack_h1) design, which is well documented and in the public domain. PortaPack H2 is a modification based on the last, from an unknown origin (without public sources) with some upgrades: * Bigger screen * Different navigation buttons @@ -8,11 +6,11 @@ Portapack H2 hardware is a custom modification of the original design, made by u * 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._ +Note: _There is also an hybrid 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)). +Both feature a **headphone connector** and the **AK4951 AUDIO / CODEC IC** ([datasheet](https://www.akm.com/content/dam/documents/products/audio/audio-codec/ak4951aen/ak4951aen-en-datasheet.pdf)). The AK4951 includes separate pins for speaker and headphone output: @@ -21,14 +19,7 @@ The AK4951 includes separate pins for speaker and headphone output: Upon close inspection, several differences arise: -## H2 Portapack audio -Portapack H2 circuitboard includes a connector header for easily adding an internal speaker. - -The **AK4951 IC** has been rotated by 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 mechanical switch, detecting the insertion of a male plug in it. - -## H1 Portapack audio +## H1 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. @@ -36,18 +27,25 @@ Only the soldering pads for an internal speaker connector header are present. Th **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 may be in the details" -Since the firmware is shared between H1 and H2, on Portapack H2 you end up powering TWO speaker amplifiers: The one inside AK4951 IC, and the extra CS8122S one. +## H2 +PortaPack H2 circuitboard includes a connector header for easily adding an internal speaker. + +The **AK4951 IC** has been rotated by 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 mechanical switch, detecting the insertion of a male plug in it. + +### Known issues +Since the firmware is shared between H1 and H2, on PortaPack H2 you end up powering TWO speaker amplifiers: The one inside AK4951 IC, and the extra CS8122S one. # Power Supply -## H1 Portapack -There is no internal battery on your H1 Portapack: You will need to power it up externally, from your computer or an USB powerbank. +## H1 +There is no internal battery on your H1 PortaPack: You will need to power it up externally, from your computer or an USB powerbank. -H1 Portapack design does NOT include any battery charging circuit, nor a provision for a power on/off switch. +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. +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 -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 +H2 includes an internal Li-Ion battery, standard battery charging / management IC (located at the side of the speakerphone connector) and power switch. \ No newline at end of file