555 problem in astable mode

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riyaj

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i m getting problem in 555 astable mode...
actually m using 555 to generate 5 frequencies so m putting a switch after R2 resistor keeping R1 fixed n c=1uf..
we know when it is open output should b high and when close output should b low...
but it is not giving the correct output...y???
 

Dear riyaj
Hi
What do you mean by :
" generate 5 frequencies "?
and i can't understand , that what is your accurate problem ! can you attach your schematic ? and tell me a bit more explanation about what is your problem exactly ?
Best Wishes
Goldsmith
 

see d ckt attach...we i close d switch d MULTIMETER reading should be 0V and when i release d switch reading shold be Vcc(9v )...
but it doesn't happen when u continuously switch on off the switch....
i mean when i open d switch reading is still 0v it should be Vcc(9v)
 

actually my aim is to blink the leds when i closed d switch and off the leds when i open d switch
but what happens is when i closed open d switch continuously leds are blinking always inspite i hv opened d switch
 

riyaj said:
actually my aim is to blink the leds when i closed d switch and off the leds when i open d switch
Click to expand...
I think you can do that with one 555. Try this circuit:

 

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