Mic Stereo With Little Amp in a Pencil Box

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About: Visit my site www.emilio.com.mx

Mic stereo with little amp in a pencil box, i build this for my project http://www.archivosonoro.org is a non-profit project about the Soundscapes and Field recordings. This box use with a MD-510n Minidisc recorder with Analogical IN.

Happy build!!!

Step 1: Parts

The goal of this project is reuse and use cheap parts, well in my country (Mexico) are a Shops with articles from China (China everywhere!!!), in this kind of Shop buy a metal boxes pencils (and other wondefull and usefull things for Build, Make and enjoy the DIY).

From my garbage electronic:

2 transistors NPN BC548 (experiment with others if you like for example: 2n2222, c1056, etc)

1 Jack plug Male Stereo

1 Switch

2 Electrec mic

1 Little piece of hose transparent from my old Acuarius Tank

1 Battery holder 2 AA

Various screws, and hole drills.

Step 2: Drill and Wires

Make a holes for jack stereo, hose, and for close the box. Make a wire for the Right and Left Channel electrec mic.

Step 3: Insert the Mics

Warm a little the transparent hose and insert the electrec mics.

Step 4: Put the Battery Holder

For this i use a square of "Fasters"

Step 5: The Funny Step HOMEBREW

Well this is the funny step "Electronic Homebrew" i use a broken PC monitor:

Step 6: Warm and Make Connections

Follow the circuit and make connections with the most beautiful style: UGLY STYLE ;-)

Step 7: Two Is Best of One

On my project www.archivosonoro.org have a collaborate friends and make for they this boxes.

Step 8: Result

I make Fieldrecordings, interviews, Sounscapes and other sounds things with this box and Sony Minidisc MD-510n, the follow links are a few examples about performance of this project:

Music box with White Cristhmas Theme
Music box with White Cristmas Theme

Soundscape from my city Tuxtla Gutierrez, Chiapas. Mexico
Soundscape from my city Tuxtla Gutierrez, Chiapas. Mexico

You are found others recordings: http://www.archivosonoro.org

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    56 Discussions

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    khushal_kkk

    8 years ago on Introduction

    do this circuit works for a stereo system , like i designed a system in which 3.5mm stereo jack is used and i use to connect it to computer to listen song through speaker do this mic work with it if i talk in that would i be abble to transmitt my voice through this designed stereo mic.

    1 reply
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    llavenkhushal_kkk

    Reply 8 years ago on Introduction

    This mic work verywell for PC but remember is for soundscapes records, i mean, is for record sound ambients.

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    NeoFusion

    8 years ago on Step 6

    i cant understand the circuit well, hmm why is that there is only 1 electret mic on the schematic? help here total noob and i want to make your project badly!

    1 reply
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    llavenNeoFusion

    Reply 8 years ago on Step 6

    Hi, because is the circuit for 1 channel, if you need 2 channels (Left and Right) just make twice and put in the same box, with same battery and switch but 2 mics of course.

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    llavenShaunHill

    Reply 10 years ago on Introduction

    Hi, the project is a mic amp for use in Minidisc with Line in for field recording

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    llavenGorillazMiko

    Reply 10 years ago on Introduction

    Thanks for stars and words, if you make your own, please let me know and share photos!!

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    baruc

    10 years ago on Introduction

    hola se ve muy bien, y como apenas empiezo en esto de la electronica lo he hecho en un protoboard, no copie el modelo de el ultimo post, porque use más bien tres resistencias en serie que me sumaron 480k en lugar de la de 470k, y use un transistor 2n2222A, ahora, el mic. sólo lo probe y si funciona, pero ya en el circuito cuando lo conecto a mi grabadora de voz(panasonic) o a mi lap, me entra un ruido muy fuerte como de interferencia, como un tiiiiiii... nose que pueda ser. me surgio la pregunta de para que me sirve entonces, talvez no necesite un preamp.. nose podria explicarme como lo puedo ocupar, y porque crees que tengo ese ruido? gracias.

    2 replies
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    llavenbaruc

    Reply 10 years ago on Introduction

    Que tal baruc disculpa que te responda hasta ahora, al parecer hay una retroalimentación en tu circuito, prueba conectarlo en tu lap pero antes de eso abre la aplicación que controla el volúmen del micrófono, las lap tops traen integrado un preamplificador, y quizá también tu equipo panasonic, quizá lo único que requieres son los micrófonos que estan separados para poder grabar el ambiente del lugar, además la grabación debe de hacerse en dispositivos stereo es decir con canal derecho e izquierdo para una percepción binaural

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    barucllaven

    Reply 10 years ago on Introduction

    gracias por responder. probare más y te escribo de nuevo igual con una foto de mi circuito. saludos

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    truax

    11 years ago on Introduction

    can anyone see something wrong with my circuit? i've tried all sorts of stuff and it won't work.. help!

    HPIM1360.JPGHPIM1361.JPG
    5 replies
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    llaventruax

    Reply 11 years ago on Introduction

    I dont see the terminal negative of jack connected to ground (-) in your circuit

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    truaxllaven

    Reply 11 years ago on Introduction

    and i'm guessing the ground for the mic also should also be hooked up to the negative?

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    llaventruax

    Reply 11 years ago on Introduction

    yep, the ground for mic to negative of circuit (negative battery)

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    truaxllaven

    Reply 11 years ago on Introduction

    hmm. something is still wrong. is it necessary to be using the BC-548 transistor?.. i have here the 2n2222.