up down counter

[hardcore misery]

image 1

S3 and S4 are both switched to UP for COUNTING UPWARD
S3 and S4 are both switched to DOWN for COUNTING DOWNWARD

S2 is switch to UP to run the counter, otherwise it stops the counter


i've tested it with a PULSER ( see image 1)

and the circuit runs according to the settings...

(sir Ayne, is there any problem with the S4? it runs with the pulser so i have no doubts with it,
but please correct me if i'm wrong)



image 2


I've replaced the pulser with your ASTABLE circuit and connected it to S3

however the 7seg display doesn't shows output.. but the output waveform on the ASTABLE shows..

so sir, is this the correct and working circuit? without simulating it... is there any assurance
that this will work? this project is to be passed on tuesday, and we have exams on monday.. we
will do an overnyt on my classmates house to work on this...the status of our project? 0%

all of you were a big help for me...so i'm hoping that this circuit which was a product of yours, Mr.Ayne
will work out, for us to finish all the stuffs... we were time pressured..

i'm a student....so just waiting for a confirmation

 

[hardcore misery]

View attachment circuits1and2.zip

correction for the attached circuits...please check on this.

 

[Ayne]

Now from Start.
Make 555 astable circuit (on breadboard) which i have post before and tell me that it is working or nor..
I am waiting ur reply

 

[audioguru]

The output of the 555 pulser is its pin 3, not at the LED.

 

[Ayne]

audioguru is right
Make circuit which i have post before....... not ur's
Just make 555 part and see that led blinks or not.

 

[hardcore misery]

so is this the working circuit? can't test the actual circuit of this 555 timer... i don't have the resistors...

is the pushbutton at the RESET can be replaced with a SPST switch? (in actual operation)

 

[Ayne]

Circuit is complete

I have attached both PICture and Circuit Maker file...

U can check this circuit in circuit maker in Digital circuit Simulation..
Circuit is working properly..

Now start to build on bread board..... Section by section

First make 555 timer circuit and see that LED is blinking or not....
Then 74LS47 with 7-Segment.... and check it.... apply different input and check that 7 segment is displaying something..
In third make counter circuit with 74LS192.... and connect all things together.

Check the datasheets of ur ICs for pin configurations...

I hope this will work

I not check ur circuits......(Soory)

 

[hardcore misery]

or is this the right one?

 

[audioguru]

NO!
Pin 3 of the 555 is its output to the counter switch SW1, not ground.

You have removed the very important 47uF supply bypass capacitor from the 555's power supply pins and you have not added the very important 0.1uF ceramic disc supply bypass capacitors at the logic ICs.

 

[hardcore misery]

I have attached both PICture and Circuit Maker file...

U can check this circuit in circuit maker in Digital circuit Simulation..
Circuit is working properly..

Now start to build on bread board..... Section by section

First make 555 timer circuit and see that LED is blinking or not....
Then 74LS47 with 7-Segment.... and check it.... apply different input and check that 7 segment is displaying something..
In third make counter circuit with 74LS192.... and connect all things together.

Check the datasheets of ur ICs for pin configurations...

I hope this will work

I not check ur circuits......(Soory)

your circuit works on simulation...

sir what about V3 ( between the output of 555 and up down switch)which is the pulser on your circuit and the .IC on the pin2 of the timer circuit... are these gonna be used in the actual circuit? or those were just added to simulate the whole circuit, but in actual, those were not applied... is this correct?

 

[hardcore misery]

and again, is the PUSHBUTTON used in the RESET BUTTON can be replaced with SPST switch?

 

[hardcore misery]

NO!
Pin 3 of the 555 is its output to the counter switch SW1, not ground.

You have removed the very important 47uF supply bypass capacitor from the 555's power supply pins and you have not added the very important 0.1uF ceramic disc supply bypass capacitors at the logic ICs.

sir where should i connect exactly the ceramic caps and 47uF?

 

[hardcore misery]

at what specific PIN of the 555 timer

 

[audioguru]

The 47uF capacitor should be connected at the power supply pins pin 1 and pin 8 of the 555, add a 0.1uF ceramic disc capacitor in parallel.

The 0.1uF ceramic disc capacitors are the supply bypass capacitors for the logic ICs. Connect them with very short wires to the power supply pins of the ICs.

All ICs should have a supply bypass capacitor.

 

[hardcore misery]

Default
Quote:
NO!
Pin 3 of the 555 is its output to the counter switch SW1, not ground.

You have removed the very important 47uF supply bypass capacitor from the 555's power supply pins and you have not added the very important 0.1uF ceramic disc supply bypass capacitors at the logic ICs.

sir do you mean at all IC's on the circuit? (74ls192, 74ls47,LM555)

should i put the bpass cap at Vcc pin of each IC's?

 

[hardcore misery]

the 0.1uF caps should be connected between the Vcc and GND?

the circuit maker doesnt display the Vcc of all IC's but in actual it has..

so is this correct? the 0.1uF caps should be connected between the Vcc and GND?

 

[hardcore misery]

is it?

 

[audioguru]

I said to connect supply bypass capacitors.
I said at the power supply pins of the ICs.

You should know what are the power supply pins of the ICs, Circuit Maker doesn't.

 

[Ayne]

your circuit works on simulation...

sir what about V3 ( between the output of 555 and up down switch)which is the pulser on your circuit and the .IC on the pin2 of the timer circuit... are these gonna be used in the actual circuit? or those were just added to simulate the whole circuit, but in actual, those were not applied... is this correct?

V3 is just for simulation..... it will not include in real world..

and again, is the PUSHBUTTON used in the RESET BUTTON can be replaced with SPST switch?

Yes u can use with no problem

 

[Ayne]

Your Circuit Maker program makes terrible-looking schematics.
I fixed it with Microsoft Paint.

No,
It makes beautiful pictures, but it is on ur owns..

It is good simulator i ever found....
it is enough beter than workbech...