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Sall, ma lamuriti si pe mn cu ceva?

 

1)Cele 2 tranzistoare din simbolurile urmatoare reprezinta acelasi lucru, adica acelasi tranzistor in simboluri diferite sau e vreao diferenta intre ele?daca e va rog sa imi sa imi explicati si mie.

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b) Posted Image

 

2) Am gasit ceva prin casa care arata ca o ,,busola'' si indica niste valori si este in limba rusa , cineva mi-a zis ca are legatura cu domeniul electric dar nu stiu acum. Stiti cumva ce e si pentru ce se foloseste?

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