6 files changed, 752 insertions, 0 deletions
diff --git a/LICENCE b/LICENCE
new file mode 100644
@@ -0,0 +1,437 @@
+Attribution-NonCommercial-ShareAlike 4.0 International
+Creative Commons Corporation ("Creative Commons") is not a law firm and
+does not provide legal services or legal advice. Distribution of
+Creative Commons public licenses does not create a lawyer-client or
+other relationship. Creative Commons makes its licenses and related
+information available on an "as-is" basis. Creative Commons gives no
+warranties regarding its licenses, any material licensed under their
+terms and conditions, or any related information. Creative Commons
+disclaims all liability for damages resulting from their use to the
+fullest extent possible.
+Using Creative Commons Public Licenses
+Creative Commons public licenses provide a standard set of terms and
+conditions that creators and other rights holders may use to share
+original works of authorship and other material subject to copyright
+and certain other rights specified in the public license below. The
+following considerations are for informational purposes only, are not
+exhaustive, and do not form part of our licenses.
+ Considerations for licensors: Our public licenses are
+ intended for use by those authorized to give the public
+ permission to use material in ways otherwise restricted by
+ copyright and certain other rights. Our licenses are
+ irrevocable. Licensors should read and understand the terms
+ and conditions of the license they choose before applying it.
+ Licensors should also secure all rights necessary before
+ applying our licenses so that the public can reuse the
+ material as expected. Licensors should clearly mark any
+ material not subject to the license. This includes other CC-
+ licensed material, or material used under an exception or
+ limitation to copyright. More considerations for licensors:
+ Considerations for the public: By using one of our public
+ licenses, a licensor grants the public permission to use the
+ licensed material under specified terms and conditions. If
+ the licensor's permission is not necessary for any reason--for
+ example, because of any applicable exception or limitation to
+ copyright--then that use is not regulated by the license. Our
+ licenses grant only permissions under copyright and certain
+ other rights that a licensor has authority to grant. Use of
+ the licensed material may still be restricted for other
+ reasons, including because others have copyright or other
+ rights in the material. A licensor may make special requests,
+ such as asking that all changes be marked or described.
+ Although not required by our licenses, you are encouraged to
+ respect those requests where reasonable. More_considerations
+ for the public:
+Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International
+By exercising the Licensed Rights (defined below), You accept and agree
+to be bound by the terms and conditions of this Creative Commons
+Attribution-NonCommercial-ShareAlike 4.0 International Public License
+("Public License"). To the extent this Public License may be
+interpreted as a contract, You are granted the Licensed Rights in
+consideration of Your acceptance of these terms and conditions, and the
+Licensor grants You such rights in consideration of benefits the
+Licensor receives from making the Licensed Material available under
+these terms and conditions.
+Section 1 -- Definitions.
+ a. Adapted Material means material subject to Copyright and Similar
+ Rights that is derived from or based upon the Licensed Material
+ and in which the Licensed Material is translated, altered,
+ arranged, transformed, or otherwise modified in a manner requiring
+ permission under the Copyright and Similar Rights held by the
+ Licensor. For purposes of this Public License, where the Licensed
+ Material is a musical work, performance, or sound recording,
+ Adapted Material is always produced where the Licensed Material is
+ synched in timed relation with a moving image.
+ b. Adapter's License means the license You apply to Your Copyright
+ and Similar Rights in Your contributions to Adapted Material in
+ accordance with the terms and conditions of this Public License.
+ c. BY-NC-SA Compatible License means a license listed at
+ creativecommons.org/compatiblelicenses, approved by Creative
+ Commons as essentially the equivalent of this Public License.
+ d. Copyright and Similar Rights means copyright and/or similar rights
+ closely related to copyright including, without limitation,
+ performance, broadcast, sound recording, and Sui Generis Database
+ Rights, without regard to how the rights are labeled or
+ categorized. For purposes of this Public License, the rights
+ specified in Section 2(b)(1)-(2) are not Copyright and Similar
+ e. Effective Technological Measures means those measures that, in the
+ absence of proper authority, may not be circumvented under laws
+ fulfilling obligations under Article 11 of the WIPO Copyright
+ Treaty adopted on December 20, 1996, and/or similar international
+ f. Exceptions and Limitations means fair use, fair dealing, and/or
+ any other exception or limitation to Copyright and Similar Rights
+ that applies to Your use of the Licensed Material.
+ g. License Elements means the license attributes listed in the name
+ of a Creative Commons Public License. The License Elements of this
+ Public License are Attribution, NonCommercial, and ShareAlike.
+ h. Licensed Material means the artistic or literary work, database,
+ or other material to which the Licensor applied this Public
+ i. Licensed Rights means the rights granted to You subject to the
+ terms and conditions of this Public License, which are limited to
+ all Copyright and Similar Rights that apply to Your use of the
+ Licensed Material and that the Licensor has authority to license.
+ j. Licensor means the individual(s) or entity(ies) granting rights
+ under this Public License.
+ k. NonCommercial means not primarily intended for or directed towards
+ commercial advantage or monetary compensation. For purposes of
+ this Public License, the exchange of the Licensed Material for
+ other material subject to Copyright and Similar Rights by digital
+ file-sharing or similar means is NonCommercial provided there is
+ no payment of monetary compensation in connection with the
+ l. Share means to provide material to the public by any means or
+ process that requires permission under the Licensed Rights, such
+ as reproduction, public display, public performance, distribution,
+ dissemination, communication, or importation, and to make material
+ available to the public including in ways that members of the
+ public may access the material from a place and at a time
+ individually chosen by them.
+ m. Sui Generis Database Rights means rights other than copyright
+ resulting from Directive 96/9/EC of the European Parliament and of
+ the Council of 11 March 1996 on the legal protection of databases,
+ as amended and/or succeeded, as well as other essentially
+ equivalent rights anywhere in the world.
+ n. You means the individual or entity exercising the Licensed Rights
+ under this Public License. Your has a corresponding meaning.
+Section 2 -- Scope.
+ a. License grant.
+ 1. Subject to the terms and conditions of this Public License,
+ the Licensor hereby grants You a worldwide, royalty-free,
+ non-sublicensable, non-exclusive, irrevocable license to
+ exercise the Licensed Rights in the Licensed Material to:
+ a. reproduce and Share the Licensed Material, in whole or
+ in part, for NonCommercial purposes only; and
+ b. produce, reproduce, and Share Adapted Material for
+ NonCommercial purposes only.
+ 2. Exceptions and Limitations. For the avoidance of doubt, where
+ Exceptions and Limitations apply to Your use, this Public
+ License does not apply, and You do not need to comply with
+ its terms and conditions.
+ 3. Term. The term of this Public License is specified in Section
+ 4. Media and formats; technical modifications allowed. The
+ Licensor authorizes You to exercise the Licensed Rights in
+ all media and formats whether now known or hereafter created,
+ and to make technical modifications necessary to do so. The
+ Licensor waives and/or agrees not to assert any right or
+ authority to forbid You from making technical modifications
+ necessary to exercise the Licensed Rights, including
+ technical modifications necessary to circumvent Effective
+ Technological Measures. For purposes of this Public License,
+ simply making modifications authorized by this Section 2(a)
+ (4) never produces Adapted Material.
+ 5. Downstream recipients.
+ a. Offer from the Licensor -- Licensed Material. Every
+ recipient of the Licensed Material automatically
+ receives an offer from the Licensor to exercise the
+ Licensed Rights under the terms and conditions of this
+ Public License.
+ b. Additional offer from the Licensor -- Adapted Material.
+ Every recipient of Adapted Material from You
+ automatically receives an offer from the Licensor to
+ exercise the Licensed Rights in the Adapted Material
+ under the conditions of the Adapter's License You apply.
+ c. No downstream restrictions. You may not offer or impose
+ any additional or different terms or conditions on, or
+ apply any Effective Technological Measures to, the
+ Licensed Material if doing so restricts exercise of the
+ Licensed Rights by any recipient of the Licensed
+ 6. No endorsement. Nothing in this Public License constitutes or
+ may be construed as permission to assert or imply that You
+ are, or that Your use of the Licensed Material is, connected
+ with, or sponsored, endorsed, or granted official status by,
+ the Licensor or others designated to receive attribution as
+ provided in Section 3(a)(1)(A)(i).
+ b. Other rights.
+ 1. Moral rights, such as the right of integrity, are not
+ licensed under this Public License, nor are publicity,
+ privacy, and/or other similar personality rights; however, to
+ the extent possible, the Licensor waives and/or agrees not to
+ assert any such rights held by the Licensor to the limited
+ extent necessary to allow You to exercise the Licensed
+ Rights, but not otherwise.
+ 2. Patent and trademark rights are not licensed under this
+ Public License.
+ 3. To the extent possible, the Licensor waives any right to
+ collect royalties from You for the exercise of the Licensed
+ Rights, whether directly or through a collecting society
+ under any voluntary or waivable statutory or compulsory
+ licensing scheme. In all other cases the Licensor expressly
+ reserves any right to collect such royalties, including when
+ the Licensed Material is used other than for NonCommercial
+Section 3 -- License Conditions.
+Your exercise of the Licensed Rights is expressly made subject to the
+ a. Attribution.
+ 1. If You Share the Licensed Material (including in modified
+ form), You must:
+ a. retain the following if it is supplied by the Licensor
+ with the Licensed Material:
+ i. identification of the creator(s) of the Licensed
+ Material and any others designated to receive
+ attribution, in any reasonable manner requested by
+ the Licensor (including by pseudonym if
+ ii. a copyright notice;
+ iii. a notice that refers to this Public License;
+ iv. a notice that refers to the disclaimer of
+ v. a URI or hyperlink to the Licensed Material to the
+ extent reasonably practicable;
+ b. indicate if You modified the Licensed Material and
+ retain an indication of any previous modifications; and
+ c. indicate the Licensed Material is licensed under this
+ Public License, and include the text of, or the URI or
+ hyperlink to, this Public License.
+ 2. You may satisfy the conditions in Section 3(a)(1) in any
+ reasonable manner based on the medium, means, and context in
+ which You Share the Licensed Material. For example, it may be
+ reasonable to satisfy the conditions by providing a URI or
+ hyperlink to a resource that includes the required
+ 3. If requested by the Licensor, You must remove any of the
+ information required by Section 3(a)(1)(A) to the extent
+ reasonably practicable.
+ b. ShareAlike.
+ In addition to the conditions in Section 3(a), if You Share
+ Adapted Material You produce, the following conditions also apply.
+ 1. The Adapter's License You apply must be a Creative Commons
+ license with the same License Elements, this version or
+ later, or a BY-NC-SA Compatible License.
+ 2. You must include the text of, or the URI or hyperlink to, the
+ Adapter's License You apply. You may satisfy this condition
+ in any reasonable manner based on the medium, means, and
+ context in which You Share Adapted Material.
+ 3. You may not offer or impose any additional or different terms
+ or conditions on, or apply any Effective Technological
+ Measures to, Adapted Material that restrict exercise of the
+ rights granted under the Adapter's License You apply.
+Section 4 -- Sui Generis Database Rights.
+Where the Licensed Rights include Sui Generis Database Rights that
+apply to Your use of the Licensed Material:
+ a. for the avoidance of doubt, Section 2(a)(1) grants You the right
+ to extract, reuse, reproduce, and Share all or a substantial
+ portion of the contents of the database for NonCommercial purposes
+ b. if You include all or a substantial portion of the database
+ contents in a database in which You have Sui Generis Database
+ Rights, then the database in which You have Sui Generis Database
+ Rights (but not its individual contents) is Adapted Material,
+ including for purposes of Section 3(b); and
+ c. You must comply with the conditions in Section 3(a) if You Share
+ all or a substantial portion of the contents of the database.
+For the avoidance of doubt, this Section 4 supplements and does not
+replace Your obligations under this Public License where the Licensed
+Rights include other Copyright and Similar Rights.
+Section 5 -- Disclaimer of Warranties and Limitation of Liability.
+ a. UNLESS OTHERWISE SEPARATELY UNDERTAKEN BY THE LICENSOR, TO THE
+ EXTENT POSSIBLE, THE LICENSOR OFFERS THE LICENSED MATERIAL AS-IS
+ AND AS-AVAILABLE, AND MAKES NO REPRESENTATIONS OR WARRANTIES OF
+ ANY KIND CONCERNING THE LICENSED MATERIAL, WHETHER EXPRESS,
+ IMPLIED, STATUTORY, OR OTHER. THIS INCLUDES, WITHOUT LIMITATION,
+ WARRANTIES OF TITLE, MERCHANTABILITY, FITNESS FOR A PARTICULAR
+ PURPOSE, NON-INFRINGEMENT, ABSENCE OF LATENT OR OTHER DEFECTS,
+ ACCURACY, OR THE PRESENCE OR ABSENCE OF ERRORS, WHETHER OR NOT
+ KNOWN OR DISCOVERABLE. WHERE DISCLAIMERS OF WARRANTIES ARE NOT
+ ALLOWED IN FULL OR IN PART, THIS DISCLAIMER MAY NOT APPLY TO YOU.
+ b. TO THE EXTENT POSSIBLE, IN NO EVENT WILL THE LICENSOR BE LIABLE
+ TO YOU ON ANY LEGAL THEORY (INCLUDING, WITHOUT LIMITATION,
+ NEGLIGENCE) OR OTHERWISE FOR ANY DIRECT, SPECIAL, INDIRECT,
+ INCIDENTAL, CONSEQUENTIAL, PUNITIVE, EXEMPLARY, OR OTHER LOSSES,
+ COSTS, EXPENSES, OR DAMAGES ARISING OUT OF THIS PUBLIC LICENSE OR
+ USE OF THE LICENSED MATERIAL, EVEN IF THE LICENSOR HAS BEEN
+ ADVISED OF THE POSSIBILITY OF SUCH LOSSES, COSTS, EXPENSES, OR
+ DAMAGES. WHERE A LIMITATION OF LIABILITY IS NOT ALLOWED IN FULL OR
+ IN PART, THIS LIMITATION MAY NOT APPLY TO YOU.
+ c. The disclaimer of warranties and limitation of liability provided
+ above shall be interpreted in a manner that, to the extent
+ possible, most closely approximates an absolute disclaimer and
+ waiver of all liability.
+Section 6 -- Term and Termination.
+ a. This Public License applies for the term of the Copyright and
+ Similar Rights licensed here. However, if You fail to comply with
+ this Public License, then Your rights under this Public License
+ terminate automatically.
+ b. Where Your right to use the Licensed Material has terminated under
+ Section 6(a), it reinstates:
+ 1. automatically as of the date the violation is cured, provided
+ it is cured within 30 days of Your discovery of the
+ violation; or
+ 2. upon express reinstatement by the Licensor.
+ For the avoidance of doubt, this Section 6(b) does not affect any
+ right the Licensor may have to seek remedies for Your violations
+ of this Public License.
+ c. For the avoidance of doubt, the Licensor may also offer the
+ Licensed Material under separate terms or conditions or stop
+ distributing the Licensed Material at any time; however, doing so
+ will not terminate this Public License.
+ d. Sections 1, 5, 6, 7, and 8 survive termination of this Public
+Section 7 -- Other Terms and Conditions.
+ a. The Licensor shall not be bound by any additional or different
+ terms or conditions communicated by You unless expressly agreed.
+ b. Any arrangements, understandings, or agreements regarding the
+ Licensed Material not stated herein are separate from and
+ independent of the terms and conditions of this Public License.
+Section 8 -- Interpretation.
+ a. For the avoidance of doubt, this Public License does not, and
+ shall not be interpreted to, reduce, limit, restrict, or impose
+ conditions on any use of the Licensed Material that could lawfully
+ be made without permission under this Public License.
+ b. To the extent possible, if any provision of this Public License is
+ deemed unenforceable, it shall be automatically reformed to the
+ minimum extent necessary to make it enforceable. If the provision
+ cannot be reformed, it shall be severed from this Public License
+ without affecting the enforceability of the remaining terms and
+ c. No term or condition of this Public License will be waived and no
+ failure to comply consented to unless expressly agreed to by the
+ d. Nothing in this Public License constitutes or may be interpreted
+ as a limitation upon, or waiver of, any privileges and immunities
+ that apply to the Licensor or You, including from the legal
+ processes of any jurisdiction or authority.
+Creative Commons is not a party to its public
+licenses. Notwithstanding, Creative Commons may elect to apply one of
+its public licenses to material it publishes and in those instances
+will be considered the “Licensor.” The text of the Creative Commons
+public licenses is dedicated to the public domain under the CC0 Public
+Domain Dedication. Except for the limited purpose of indicating that
+material is shared under a Creative Commons public license or as
+otherwise permitted by the Creative Commons policies published at
+creativecommons.org/policies, Creative Commons does not authorize the
+use of the trademark "Creative Commons" or any other trademark or logo
+of Creative Commons without its prior written consent including,
+without limitation, in connection with any unauthorized modifications
+to any of its public licenses or any other arrangements,
+understandings, or agreements concerning use of licensed material. For
+the avoidance of doubt, this paragraph does not form part of the
+Creative Commons may be contacted at creativecommons.org.
diff --git a/notes b/notes
new file mode 100644
@@ -0,0 +1,199 @@
+Input power supply needs to be reasonable and we'll buck that down to 5v.
+Anything based on the MC34063 seems plausible, they're cheap and require only a
+few external components. Also there is already a schematic symbol in KiCAD.
+http://www.farnell.com/datasheets/1723944.pdf is a possible datasheet for this.
+The 5v rail shall be considered the primary supply rail, we want to provide for
+the chromecast audio and also all the 3.3v logic. The logic alone totals
+almost 100mA and then we need some spare for other things, so we should assume
+we want around 750mA at 5v if we're to offer a full 500mA to the USB.
+The CCA only draws a characterised 200mA at 5v, so we could get away with 500mA
+at 5v total buck output. An MC34063 based system should be capable of up to
+1.5A though, so we can arrange for a reasonable output current.
+GIven we in theory want 750mA max output, and the peak current in step down is
+twice the desired current, we need a 1.5A to 3A capable schottky diode for the
+output and so perhaps http://www.farnell.com/datasheets/1915575.pdf might do.
+Working through the calculations in table 12 of the sheet above, with the
+following goal parameters:
+Vout = 5v
+Iout(max) = 1.5A
+Vripple(p-p) = 50mV
+Vin(min) = 9v
+Vsat = 1v (darlington configuration since step down)
+Vf = 600mV (From the diode above)
+Fmin = 100KHz (theoretical maximum of the device)
+Ton/Toff = (5 + 0.6) / (9 - 1 - 5) = 5.6 / 3 = 1.87
+(Ton+Toff)max = 1/100000 = 10uS
+Ton = 6.515uS
+Ct = 4.5e-5 * Ton = 293pF
+Ipk(switch) = 2*Iout(max) = 1.5A
+Rsc = 0.3 / Ipk = 0.13 ohms
+Co = (Ipk(switch) * (Ton+Toff)) / (8 * Vripple(p-p))
+ = (1.5 * 10uS) / (8 * 50mV)
+ = 0.000015 / 0.4 = 0.0000375 = 37.5 uF
+L(min) = (Vin(min) - Vsat - Vout) / Ipk(sw) * Ton(min)
+ = (9 - 1 - 5) / 1.5 * 6.515uS
+ = 2 * 6.515
+ = 13 uH
+In addition, we need to calculate the divider ratio, we want 5v out
+and the reference is 1.25v meaning we need a 1.25 : 3.75 divider
+Vout = 1.25 (1 + R2/R1)
+5v = 1.25 (1 + R2/R1)
+R2/R1 = 3
+As such, perhaps a 10K below 3 10Ks in series?
+A useful appnote sheet on this DCDC is:
+We're going to split the board into a number of 3.3v domains.
+FP_VDD - Front panel (likely 80mA to 100mA needed)
+DAC_DVDD - DAC digital power (naff all needed)
+DAC_AVDD - DAC analogue power (20mA or so needed I think)
+STM_VDD - STM32 power (a few tens of mA)
+RX_VDD - S/PDIF receiver circuitry (20mA or so needed)
+is a reasonable LDO, in SOT23-3 format it should be pretty easy to fit plenty
+of them onto the board.
+Alternatively we could use: http://www.ti.com/lit/ds/symlink/tps788.pdf which
+would give us the ability to perhaps control the power wells independently
+which might be fun. We could have the STM32 power up first, set up its IOs and
+then bring up each part in turn. Specifically we'd use the TPS78833 which is
+the 3.3v option.
+We need to find some suitable low-ESR (but not ultra-low ESR) surface-mount
+capacitors suitable for use for the LDOs. F920J475MPA will do at 7.4p each
+from Mouser. It's worth noting that these tants are polarised and 0805.
+The display board we're looking at from acme systems is:
+Based on datasheets I think it's around 80mA @ 3.3v It has a 10 way 0.1" pitch
+connector. The connector is not fully connected, so we can possibly put other
+stuff onto the same pin header on our board.
+3.3v 1 2
+ 3 4
+ 5 6
+SDA 7 8 SCL
+ 9 10 GND
+In theory we could put all sorts on 2-6 and 9. My gut feeling is that I'll
+put 3.3v on 2 and GND on 9, leaving 3,4,5,6 as possible other signals.
+There are no pullups on the board for the I2C, so that needs to be taken into
+account when we put the I2C bus around the board.
+We're using https://www.cirrus.com/en/pubs/proDatasheet/WM8804_v4.5.pdf
+(WM8804) as the S/PDIF receiver/decoder. It only has 1 input so if we're to
+have coax *and* optical inputs then we need to work out how to arrange for
+those to be combined into the receiver. Some kind of 2-to-1 mux will be
+We're using http://www.ti.com/lit/ds/symlink/pcm5102a-q1.pdf (PCM5102A) as the
+DAC. It takes I2S in (from the S/PDIF receiver) and generates direct line level
+analogue outputs. Nice and simple to cad for.
+We're using an STM32F103CB(T6) which is the LQFP48 stm32 we used on the ekey.
+We're used to it, we know how it works, I'm confident I can lay out for it to
+run successfully (perhaps even on 2 layers) and it has enough features for what
+we need it to do. (Ditto, there's already a symbol for it in KiCAD)
+The Input (toslink / s/pdif) connector is FC684206R and is a CLIFF connector
+which incorporates the TOSLINK and S/PDIF COAX connectors.
+It's going to take a lot of work to get the footprint done properly because the
+sodding thing has awful scans as datasheets.
+The datasheet from datasheetlib.com is probably the best copy. We're going to
+need NPTH and PTH holes, some pins, some mechanical.
+The COAX pins are at the "back" of the device, one is centered the other
+offset. The centered pin is the signal, the offset is the ground for the COAX.
+Someone did a device using this which included schematics:
+In order to MUX this effectively, we need to take the COAX input and the
+TOSLINK input and be able to select between them. To do this, a quad 2-input
+NAND chip will work. A 74AC110000 from TI would be good if we can get it:
+In brief, use one as a NOT gate for SEL, feed COAX and SEL into one, giving
+nCOAX/1, feed TOSLINK and nSEL into the other, giving nTOSLINK/1. Feed nCOAX/1
+and nTOSLINK/1 into the final NAND gate, getting COAX/TOSLINK.
+Mouser cheaper than Digikey for low volume for the TI part.
+The soft-mute on the DAC is meant to be fail-safe. As such it will be pulled
+up to 3.3v by a divider on the 5v rail since that will collapse before the AVDD
+well. A diode to allow that to be grounded by the GPIO on the STM32 will then
+allow us to mute on demand. By pulling the STM32 side of that diode *down*,
+we will hold the DAC in mute until the STM32 chooses to unmute it by driving
+that GPIO pin high to halt the drain via the diode.
+See Page 30 of the PCM5102A datasheet for an example circuit.
+Also, depending on the way that GEN_FLAG is implemented, it may be worth
+directly ORing in that output into the mute line so that if the receiver says
+that there's nothing to play, we mute the DAC.
+Signals needed from the STM32 include:
+Programming serial port incl. boot pin control.
+Front panel connector (I2C)
+GPIOs to the DAC including: DEMP, FLT, FMT, XSMT-via-diode
+WM8804 needs an I2C link and a reset and config line control.
+Required pin-strapping for the WM8804 include enough that we should likely link
+all the relevant lines to the STM32 and then we can hold it in reset, set the
+pins up, release reset, and then reset those pins into high-Z and/or I2C as
+appropriate. As such, it might be best if we can have independent I2C lines to
+the front panel so that we don't confuse that panel by our WM8804 startup
+strapping since it may include SCL/SDA.
+Other component selections (passives etc)
+I have chosen 0805 for the most part here, though 0603 exist for many
+1uF Ceramic capacitor (0805) VJ0805Y105KXQTW1BC (3.3p Mouser)
+10uF Ceramic capacitor (0805) VJ0805G106KXQTW1BC (6.6p Mouser)
+100nF Ceramic capacitor (0805) VJ0805V104ZXQCW1BC (6.6p Mouser)
+10k resistor (0805) AS08J1002ET (3.9p Mouser)
diff --git a/samdac-cache.lib b/samdac-cache.lib
new file mode 100644
@@ -0,0 +1,4 @@
+EESchema-LIBRARY Version 2.3
diff --git a/samdac.kicad_pcb b/samdac.kicad_pcb
new file mode 100644
@@ -0,0 +1 @@
+(kicad_pcb (version 4) (host kicad "dummy file") )
diff --git a/samdac.pro b/samdac.pro
new file mode 100644
@@ -0,0 +1,63 @@
+update=Fri 22 Jan 2016 22:53:53 GMT
diff --git a/samdac.sch b/samdac.sch
new file mode 100644
@@ -0,0 +1,48 @@
+EESchema Schematic File Version 2
+EELAYER 25 0
+$Descr A4 11693 8268
+Sheet 1 1