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eduard_florentin

Aparat auditiv

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Nu stiu dc am postat corect, dar nici n-am idee unde trebuia sa postez.

Am facut acest aparat auditiv http://www.redcircuits.com/Page38.htm (pentru o strabunica). Alimentat la 1,5 V nu prea da randament, insa la 3V e super sensibil. Problema e ca am si un zgomot de fond extrem de deranjant (la 3V, la 1,5 nici nu se simte). Va rog sa-mi recomandati si mie niste tranzistori cu zgomot de fond cat mai mic sau o alta schema (eventual cu un integrat, ceva). Si m-ar mai interesa cum fac sa cresc amplificarea ca sa obtin aceeasi sensibilitate ca alimentat la 3V

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pune in primele 2 etaje BC413 care e de zgomot redus (era folosit in preamplificatoarele din casetoafoane) si redu pe R8...

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Schimba valoarea lui R1 din 10K in maxim 3K3. Poti incerca chiar valoarea de 1K5 pentru ca la 1,5V microfonul cu condensator trebuie polarizat cu o tensiune cat mai apropiata de cea de alimentare. Bafta!

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