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Microfono esterno stereo... DUBBI : Accessori e Supporti Home Made

Microfono esterno stereo... DUBBI

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Microfono esterno stereo... DUBBI

Messaggioda ondavagabonda » 21/05/2016, 8:17

Salve,
Premettendo che ho una discreta manualità, ho deciso di realizzare un microfono esterno stereo con due microcapsule della Monacor modello MCE 4500, in maniera tale da poter posizionare ognuno dei canali di ricezione all'estremità del manubrio della mia MTB, quindi a 60 cm. di distanza fra di loro.
Il tutto mi servirà per poter poi realizzare delle riprese in 5.1 con un mixaggio dei canali di qualità elevata (viaggerò da capogruppo in Spagna per 20 giorni con altri 4 mtbiker...).
Sicuramente prenderò il cavo-adattatore originale dell GoPro e lo "cannibalizzerò" per evitare il collegamento jack maschio-femmina che ritengo superfluo.

Vengo al dubbio: L'ingresso della GoPro riuscirà a reggere la tensione di alimentazione del suddetto microfono?
Le microcapsule hanno le seguenti caretteristiche:

Banda passante: 20-16000Hz
Sensibilità: 6,3mV/Pa/1kHz/± 3dB
Impedenza di uscita: 2,2kΩ
Rapporto S/R: > 58dB
Condensatore d'accoppiam.: 0,1-4,7µF
Temp. di esercizo ammessa 0-40 °C
Alimentazione 1,5-10V corrente continuar /0,5mA

Che ne pensate? Servirà una alimentazione esterna?
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Ultima modifica di Fred94 il 21/05/2016, 8:40, modificato 1 volta in totale.
Motivazione: spostato nella sezione corretta
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Re: Microfono esterno stereo... DUBBI

Messaggioda MattONE » 21/05/2016, 8:49

Bella idea, binaurale sul manubri. Prova a vedere le caratteristiche del Roland wearpro mic ( o compra quello, nn so se arrivano fino al manubrio).

E per l'adattatore se sacrifichi quello originale, tanto varrebbe farselo pure quello. Il problema é procurarsi a basso costo l'usb a 10 pin, sono quasi tutti a 5 quelli che si trovano.

Edit: 3,3 volts ( penso siano anche valide x le 4)
https://gopro.com/support/search?utf8=✓&search%5Btitle%5D=gopro+hero+2+external+microphone&options%5Bper_page%5D=15&options%5Bsimple_search%5D=true&options%5Bfilters%5D%5B0%5D%5Bfilter%5D=published&options%5Bfilters%5D%5B0%5D%5Bfilter_type%5D=status

"HERO3+ External Microphone Information
What is the reserved power bias for external mics?The reserved power bias for external mics is 3.3v. What's the impedance of the external mic?GoPro mic input impedance is 2.2 kOhms, any mic that has impedance that's close to 2.2 kOhms should be OK. Is the external mic connection balanced or unbalanced?Unbalanced


External Microphone Recommendations
Question What are the Recommended External Microphones for GoPro Cameras? Where does it apply? HERO4 HERO3+ HERO3 Answer This list is not 100% comprehensive, other mics may work, but these mics are supported: Supported by all cameras: All Rode VideoMic models Sennheiser MKE 400 Countryman Lapel (MEMWF05BD2-R) Sound Professionals SP-TFB-2 Opteka VM-100 Video Condenser Shotgun Microphone Sony ECMCS3 Clip style Omnidirectional Stereo Microphone Generally, any Lavalier microphone is supported Hero 4 Black Edition only: Shure SM57 Sennheiser MD421 Shure SM58 Shure SM7B Electrovoice Re20
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Re: Microfono esterno stereo... DUBBI

Messaggioda ondavagabonda » 21/05/2016, 10:15

I Roland WPM-10 mi hanno dato l'idea, considera che i potrei cavarmela con 10 euro di componenti, scegliendo la misura ed il posizionamento ideali alle mie esigenze.
Per il mini-usb in effetti, a trovarlo, servono 5 euro.
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Re: Microfono esterno stereo... DUBBI

Messaggioda MattONE » 21/05/2016, 10:23

Mini usb 5€spedizione inclusa? Dove? ( 10 pin naturalmente, i 5 li trovi ovunque e a pochissimo)
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Re: Microfono esterno stereo... DUBBI

Messaggioda ondavagabonda » 21/05/2016, 11:25

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Re: Microfono esterno stereo... DUBBI

Messaggioda ondavagabonda » 27/05/2016, 8:20

Per quanto riguarda il plug-in power secondo voi sarà sufficiente la gopro oppure dovrò dare un pò di corrente aggiuntiva?
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Re: Microfono esterno stereo... DUBBI

Messaggioda MattONE » 27/05/2016, 8:27

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Re: Microfono esterno stereo... DUBBI

Messaggioda ondavagabonda » 27/05/2016, 9:20

Con questo tipo di capsule microfoniche mi basta che l'ingresso microfonico della camera fornisca una tensione vicina ai 2,5 volt e da altri 3D similari su questo forum sembrerebbero non esserci problemi nella realizzazione.

Ho già realizzato un prodotto similare, monofonico, ma dovendolo mettere ad una scheda audio di un PC ho preferito mettere un circuito con una resistenza 4.7 kohm (¼ watt) ed un condensatore elettrolitico 1 µFarad (tensione inorno ai 16 V) che in questo caso lo ritengo superfluo.

PS.: il "ragazzetto" che mi faceva tutti questi calcoli e misurazioni, che io non sono capace di fare :oops: :oops: , ormai non lavora più con me... : Andry : : Andry : e quindi chiedo il conforto esterno...
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