Tih 5V je preko otpornika doslo do nozice 7, tako da tu nije moglo da prodje nesto mnogo struje. Datasheet sam naravno gledao i po onome sto pise trebalo bi da on "vuce" tih 5mA ukoliko postoji greska, u suprotnom "vucice" 50uA.... Jer nacin na koji je to napisano ja drugacije nisam razumeo.
IST-BY Pin ST-BY current Play mode, VST-BY = 5 V 50 µA
Max driving current under fault 5 mA
U svakom slucaju nije mu skodilo...
Ono sto za sada znam je sledece:
Okretanjem potenciometra ukljucuje se ostatak elektronike (potenciometar sa prekidacem)
Nema kratkog spoja na izlazu ili ispred izlaznog stepena
Napon dolazi do nozica STA540
Ulazni signal dolazi do nozica STA540 (ton kontrola radi kao i predpojacalo, nivo signala reguje na okretanje potenciometra)
Sledeci logican korak jeste zamena STA540, samo jos da dodjem do njega.
@EDIT:
Sasa, evo dela gde je objasnjeno lepo, ovo razumem
Some precautions need to be taken when designing the driving circuit for pin 7, ST-BY. For
instance, the pin cannot be directly driven by a voltage source having a current capability
higher than 5 mA. In practical cases a series resistance must be inserted, giving it the
double purpose of limiting the current at pin 7 and to smooth down the standby on/off
transitions. And, when done in combination with a capacitor, prevents output pop.
A capacitor of at least 100 nF from pin 7 to S-GND, with no resistance in between, is
necessary to ensure correct turn-on.