automatic school bell

[dwijender]

can any one post project report on this automatic school bell

 

[atferrari]

**broken link removed**

 

[ericgibbs]

can any one post project report on this automatic school bell

Hi,
This is one version, what timing periods are required.???

 

[dwijender]

i want 50 50 10 50 50 50 50 50 50

thanks for ur replies
and also i want the operation of each IC in the circuit

 

[ericgibbs]

i want 50 50 10 50 50 50 50 50 50

thanks for ur replies
and also i want the operation of each IC in the circuit

hi,
Would you post what you think what the operation of each IC is, then we can go thru it together,

 

[dwijender]

i want know how the period is change the 50 min to 10 break and 50 min lunch break

 

[ericgibbs]

i want to know how the period is change the 50min to 10min break and 50min lunch break

This circuit will show you how to make the changes, can you follow it OK.?

 

[dwijender]

i don't get it dude how the 10 min break will occur there

is there i connect all red points??? i.e o1 to o1 , o2 to o2 , o3 to o3 & q0 to q0

 

[ericgibbs]

i don't get it dude how the 10 min break will occur there

is there i connect all red points??? i.e o1 to o1 , o2 to o2 , o3 to o3 & q0 to q0

You change the resistors shown in the Red box..
I will try to do a circuit tomorrow.

 

[dwijender]

thank dude and also i want theory on this pls can u post me????

 

[ericgibbs]

thank dude and also i want theory on this pls can u post me????

I have changed the times so that you get your sequence.


You must try and tell me how you think it works, I cannot do all the project for you.

 

[dwijender]

thanks dude i definitely try and then i will post u comment

 

[dwijender]

hi whr as In this circuit VDD means supply voltage(12v) or not ???????

before the bell we connect relay or not?????/////

pls reply.

 

[dwijender]

hi whr as In this circuit VDD means supply voltage(12v) or not ???????

in-front of the bell we connect relay or not?????/////

pls reply.

 

[ericgibbs]

hi whr as In this circuit VDD means supply voltage(12v) or not ???????

in-front of the bell we connect relay or not?????/////

pls reply.

Use the circuit in post #3, and change the values I have posted to give the times you want.

 

[dwijender]

thanks dude ,the above post #3 circuit is working and know i changes the values wht u send to me

in two days i will send u reply thanks a lot

 

[dwijender]

how can u modify this pls send me the software??????

 

[ericgibbs]

how can u modify this pls send me the software??????

Which software.

If you mean LTspice its a free download from the web

 

[dwijender]

ur rockinggggggg dude up to this time i don't this software know i am downloading this

thanks a lot ψψψΦ§

 

[ericgibbs]

ur rockinggggggg dude up to this time i don't this software know i am downloading this

thanks a lot ψψψΦ§

If you get it working, this is the 'asc' file for your circuit.