problem in 74ls192 count up

[blush]

help!!
my problem is the 74ls 192 does not count up i try it in proteus and it works but when i implemented it in breadboard it doesn't work

---------- Post added at 11:25 ---------- Previous post was at 11:24 ----------

and the display is not stable also

 

[malik_zohaib]

can you show us your design????

 

[blush]

this is my design


---------- Post added at 04:22 ---------- Previous post was at 04:19 ----------

this is my design

 

[malik_zohaib]

can't see the image clearly. it might be a connection problem. double check your circuit wiring, power and ground connections.

 

[mister_rf]

@blush

First of all, what is the purpose of this circuit? :-D Some parts are just standalone, those are not connected to the circuit.

- There is not a good idea to mix bipolar transistors and logical gates in the way you have.
- Need to connect some limiting resistors (100ohms) in between BCD decoder and 7 LEDs segment display
- Connect some pull-up resistors (10k ) from the not used ‘Count Up’ and ‘Count Down’ inputs to 5V power supply

 

[blush]

the logic switch there represents a sensor.. what should i do with the transistor connection?

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i am making a conveyor using logic gates only.. the led represents the motor and it is a conveyor that is controlled by a sensor

 

[mister_rf]

In order to help you we need to have more details about functionality of the above circuit.
Can you provide state table/state diagram for it?

 

[blush]

thnx to u mister_rf ur comment helps me a lot i solve this problem