[???big help pls???]

hey guys i need some help...im new to electronics world and i need some advices and teaching about some things.i need to build a decoupler circuit but i dont know how.what is a decoupler practically mean?and i need to block dc signals for my op-amp can you pls help me how?
thanks alot guys...

[psssttt!! pinoyS!!!]

kazamico'
      im from victorias city.how about u?
btw can u help me with my project?can u pls tell me if i can create a band pass filter with a single op-amp 741?tanks alot...

[psssttt!! pinoyS!!!]

hi im a newbie n here and im also a pinoy.taga negros ko tol...

[help me pls]

pls help me find datasheets for the following compnents:

wpt440
lm741

[WPT440 Phototransistor]

pls help me find the data sheet for this component.tnx

[help pls]

pls help me find the data sheets of ics SM5262 and SM5272.somesites does not have them and i need to find an equivalent ics for this.thank you so much.

[help me create a racing timer]

timer and sensor.it should be for several cars.thank you so much...

[help me create a racing timer]

im trying to create a racing timer like in the formula one but it should be cheaper.using any sensors like laser,IR or RF.thank you...