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+====== Faire ses propres micros ======
+Déja la connexion d'un micophone en TRRS ( le truc des telephones/smartphone ): {{:son:trrs_audio_connexion.jpeg?200|}}
+  * http://micbooster.com/12-primo-microphone-capsules
+  * http://micbooster.com/primo-microphone-capsules/12-stereo-microphone-kit-of-parts-with-primo-em-172-z1-capsules.html
+  * http://www.wildmountainechoes.com/equipment/diy-stereo-electret-mics-primo-em-172-capsules
+    * http://jg1983.co.uk/Blog/diy-miniature-omnis/
+    * http://www.zachpoff.com/diy-resources/low-noise-binaural-mics-primo-em172/
+    * https://igneousflame.wordpress.com/2015/10/16/field-recordings-a-return-to/
+    * https://acousticnature.com/journal/how-to-make-diy-microphone-with-em172-272-capsules
+  * https://tombenedict.wordpress.com/2016/03/05/diy-microphone-em172-capsule-and-xlr-plug/ <== !!!
+{{:son:em172_xlr.jpg?400|}}
+{{:son:electret.png?400|}} Electret circuit The value of the resistor is usually between 2k and 10k (cap say 10uF or higher)
+  * http://voyard.free.fr/textes_audio/mots_du_son/p_d_s_exterieure.htm
+  * casque ouvert qui irait avec ? dans l'idée de faire un casque écoute & enregistrement
+    * Sennheiser PX 100-II
+    * Sennheiser HD 407
+    * Philips Fidelio X2
+====== Connexion des électrets ======
+  * https://scienceprog.com/electret-condenser-microphone-amplifier-for-use-in-microcontroller-projects/
+  * http://www.epanorama.net/circuits/microphone_powering.html
+  * http://www.epanorama.net/newepa/2014/06/30/pc-microphone-phantom-powering-improvements/
+  * http://wiki.openmusiclabs.com/wiki/BootlegMic
+  * http://www.openmusiclabs.com/projects/bootlegmic/bootlegmic-assembly/index.html
+{{:son:bootmic_schem_sm.jpg?200|}}
+====== autres trucs ======
+  * http://voyard.free.fr/textes_audio/le_microphone.htm
+Microphone ultrason
+  * http://micbooster.com/utrasonic-microphones/128-utrasonic-microphones.html
+    * https://github.com/meerstern/SPU0410LR gerber
+====== connexion des micro MEM ======
+MEM Analogique
+<code>
+   -------
+- |3     2|--------->
+  |       |       1 = output analog audio
+  |       |       2 et 3 et 5 et 6 = GND
+  |   6   |       4 = VDD (1,3V a 3,6V) en général
++ |4  5  1|---||---->
+   -------
+</code>
+uF sur la sortie audio  et si MICBIAS 2,2uF en plus BIAS/VDD
+  * https://d3uzseaevmutz1.cloudfront.net/pubs/proDatasheet/WM7132PE_4.0.pdf
+  * http://www.analog.com/media/en/technical-documentation/obsolete-data-sheets/ADMP401.pdf
+  * https://www.invensense.com/wp-content/uploads/2015/02/Using-a-MEMS-Microphone-in-a-2-Wire-Microphone-Circuit.pdf {{:son:mem3fils.png?200|}}
+  R1=499 ohm
+  C2=10uF
+  C1=1,8uF
+  Resistors R1 and RBIAS form a voltage divider with the MEMS microphone to bring the VBIAS voltage down to the  upply voltage at the VDDpin.
+  Depending on the values of VBIAS, RBIAS and the desired VDD voltage,
+  Resistor R1 ay need to be very small, as is seen in the example below.
+  The necessary series resistance (RBIAS + R1) can be alculated by modeling the microphone as a resistor through which a fixed current is flowing.
+  The typical supply current of the ADMP504 when VDD = 1.8 V is 180 μA.
+  Using Ohm’s law with 1.8 V on VDD, this  microphone can be odeled as a 10 kΩ resistor.
+  The voltage divider equation used to solve for the appropriate value for resistor R1 is:
+  [Microphone VDD] = [Bias voltage] × (10 kΩ/(10 kΩ + R1 + RBIAS)).
+  From this equation, it can be calculated that a 2.2 kΩ RBIAS resistor and a 499 Ω R1resistor divide the voltage rom the 2.2 V bias voltage to the 1.73 V microphone VDD.
+  There is a trade-off in choosing the value of R1; a higher value results in a lower VDD, but this larger value may also be necessary to prevent C2 from being too arge, as described below.
+====== Hydrophones ======
+  * https://www.zachpoff.com/resources/hydrophone-experiments-ii/
+  * http://www.instructables.com/id/Underwater-Microphone-Hydrophone/