Flip flop LED circuit

Step 2: Circuit diagram

complete the circuit according to the circuit diagram,here i have used a common circuit board, there is a simple way to find the polarity of the LED ie, by looking for the flat part in the diameter of the LED the leg in that side will be negative 

Comments

[clayman987]

I am wondering are the transistors 3904 or 2N2222A because all I have is 3904. And for the 390 ohm resistor can I use 330 ohms, sorry I don't have many parts!:)

[Mudbud]

Those should work, as long as its NPN, (to an extent)

[jimmy558]

can i operate this with aproximately 7 volt battery??

[sooraj619]

yes

[jimmy558]

what is the timing of leds turning on & off...??

[sooraj619]

about 1 second, you can increase or decrease the fading effect by changing the values of both the capacitors

[kyooby]

thank you.i remember toose days when i maded this stuffs.cool

[sooraj619]

thanks