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PaulStrat

Ep Booster Diy

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EP booster NU are J201. EP booster (si aici ma refer pentru cei ce nu stiu) este realizat dupa preampul de Echoplex EP 3 care la origine avea 2N5457 (diferente foarte mari nu sunt dar sunt). Iti recomand sa folosesti un 2N5457 si o sa vezi diferenta.

 

Felicitari pentru realizare.

 

Cu respect,

Gabriel Tudoran

Analog Sound

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3 hours ago, edy_wheazel said:

Incearca BF244/245 (A) in loc de 2N5457. EP Booster-u' l-am facut cu J201, n-o tusit de la el.

BF244 gasesti la TME, varianta SMD. (J201 tot SMD am de la ei).

Practic orice FET N-Channel  functioneaza . Doar trebuie avut grija cu factorul de amplificare pt ca va afecta gain-ul . Eu nu m-as omora prea tare dupa alea care amplifica prea "sanatos". 

Edited by ggg

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On 04.07.2017 at 19:29, sorin65 said:

fet-urile n-au "factor" de amplificare. si chiar la bipolare, hfe , factorul de amplificare, nu intra in calculul amplificarii, ci a impedantei de intrare. :)

Ok. Tocmai ca nu vroiam sa ma refer la "voltage gain" ci la caracteristicile de transfer ( functie de impedantele in curent continuu de In si Out ) care nu sunt la fel nici macar la aceleasi tipuri de FET. Cu o sursa foarte bine stabilizata si un voltmetru de mare precizie se pot observa aceste diferente care in amplificarile de semnal mic sunt critice . In mod usual la FET-uri nu se foloseste acest termen (factor de amplificare) dar practic , functioneaza ca un coeficient intre tensiunile D-G .

Edited by ggg

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