Hi there, I'm from Malaysia, and I've learned quite a few stuff about electronics back when I was studying Form 5. Generally I'm very amazed and very interested in the mechanisms of the electronic circuits. So I decided to build one automatic switch based on a transistor, some resistors and one switch, and it works perfectly. But now I want to build a single LED Flasher, and of course, searched the info thru google and the website as well, but I couldn't understand what's astable and bistable multivibrators, since these theories are applied into the blinking LED project as well. Is there a very simple explaniation about these and also some analogies? And I've seen the single LED blinker circuit too - and find it strange that sometimes the (+) from the battery can be connected to the (-) side of the transistor (for an NPN ones). Which is correct? Also, can I subsitute the 2N3906 and 2N3904 transistors to CS9012 and CS9013? Are they different? :D
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