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TL494


Turmentall
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Salut tuturor :bere:

De ceva timp ma tot roade gandul sa construiesc un Neurofon, pare a fi o chestie interesanta.

 

M-am hotarat sa folosesc schema cu TL494 de aici, dar as vrea totusi sa mai intreb pe cineva daca pare a fi corecta : http://www.next.gr/uploads/135-8941a.png . As intelege ca intre minusurile celor 2 elemente piezo vine conectat corpul uman, dar totusi plusul celui de-al 2-lea element de ce vine conectat la masa ? ...

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Vine plusul elementului piezo la masa sursei deoarece elementul piezo are masa proprie (care se aplica pe piele) pe minus. Asa se inchide circuitul, prin masa (-) piezo, piele si masa (-) celuilalt element piezo..si ramane plusul piezo care duce la masa sursei.

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Iertati va rog interventia, dar pentru ce sa asculti muzica "prin piele"? ca practic asta se intampla, dar mie mi se pare evident faptul ca tot urechea indeplineste rolul de "senzor acustic" ca sa zic asa, altfel nu ar mai fi existat persoane surdo-mute, sau oricum cei cu deficiente de auz ar fi fost de domeniul trecutului... sa inteleg ca s-au demodat castile?

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Aaha, am cam inteles cum sta treaba doar ca acum intampin ceva probleme cu cablajul :sparge:

 

Am desenat schema in Orcad ... iar atunci cand dau sa-mi faca verificarea circuitului imi da niste erori undeva si nu prea am idee de la ce. http://postimg.org/image/o5mwmm2xt/ :scarpin

 

PS: Multumesc tuturor pentru raspunsurile ce mi-au deslusit misterul :da

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