Flew off? What does that mean?

 

it broke in two pieces...half is still in the circuit and half in air...

 

Does this mean it doesn't work?

Was this the same part that was connected incorrectly.

 

No, sry it waz my mistake... i charged my battery directly through the power supply...the negative terminal of the battery became positive and the postive of the battery became negative when i connected the transistor broke....but before this the circuit waz working directly through the power supply....perhaps i made a new circuit with great finishing and charged the battery correctly now its working properly...Thanks For Your Support....

 

Bill tell me which resistors will i use for 1 second on??

 

http://forum.allaboutcircuits.com/showthread.php?t=35566 Bill, Plz Help me in this thread too..

 

http://forum.allaboutcircuits.com/showthread.php?t=35566 Bill, Plz Help me in this thread too..

I just did, before I read this one.

Wookie is better at a lot of this than I am, he is giving sound advice. I chipped in with my 2¢.

Math is your friend. I've given the formula for the oscillator, all you have to do is plug in the numbers.

Try it, and then I will check it and give the right answer. This is the homework section after all.

 

okay...i'll try nd give u the answer...

 

15k??? is this the right answer?

 

as i dun have 15k resistor with me...nd i'll go to the market next month....can i connect THREE "4.7k resistors" and ONE 1K resistor in a series....which will make 15.1k ...will it work...??

 

can we advance this circuit a little bit by adding one more variable resistor that can be adjustable off timer...from 0.5 seconds to 3 seconds..


I guess i'll call it off timer...after observing it i got to know that the relay turns on for 5 seconds and goes off for 2 seconds...nd i'll use the NC contact of the relay to turn my wiper motor on...forget all this...

adding a variable resistor is possible??

 

Yes, a variable is possible. The only thing to watch out for this design is R1 (and R3) can not be 0Ω or the 555 will fry.

For a 1 Second on time drop R1 to 4.7KΩ (a WAG).

You keep changing the specs. I hate that.

 

ohhh m sry my boy...its the last change...promise