40% duty cycle square wave generator circuit.I need help to develop this circuit

Hero999

Banned

• Oct 28, 2006

• #21

That would be grand, it's always good to see how people decide to solve problems in the end.

 

A

alphonsas

New Member

• Oct 30, 2006

• #22

look into an astable multivibrator using a 555 timer...

 

Hero999

Banned

• Oct 30, 2006

• #23

That won't work because pin 2 is shorted to 0V.

 

A

alphonsas

New Member

• Oct 31, 2006

• #24

why dosent it its a 555 timer and pin 2 is just trigger input ...you just need to give a trigger in order to change its state but as it is an astable multivibrator u dont need to change it state as it is always excited.....just try it out i ve got a duty cyle of 38% with this circuit

 

Hero999

Banned

• Oct 31, 2006

• #25

It still won't work, that capacitor on pin 2 is still shorted so it will just sit there.

 

audioguru

Well-Known Member

Most Helpful Member

• Oct 31, 2006

• #26

Read the datasheet for a 555. When pin 2 is held low then pin 3 stays high.

 

A

alphonsas

New Member

• Nov 2, 2006

• #27

ohhh yes im sorry abt that... plz dont consider the ground from the pin 2 .... it is just shorted to 6 ,..... is it ok now??

 

A

alphonsas

New Member

• Nov 2, 2006

• #28

like this

 

Hero999

Banned

• Nov 2, 2006

• #29

I've just realised, your circuit is correct but it's very confusing. Here's how it should be drawn.
**broken link removed**