Im gonna simulate the circuits here using MultiSim

 

Guys if i use a ne555 timer how do i make it count at the normal speed and only up to 24? (Like a shot clock)

A different counter or modifying the up / down counter?
Count in seconds? With what accuracy?
Count up or down?
Replace the count pushbutton and Schmitt Trigger with the LM555 counting at a one second rate. Have the counter reset at a count of 24.

 

A different counter or modifying the up / down counter?
Count in seconds? With what accuracy?
Count up or down?
Replace the count pushbutton and Schmitt Trigger with the LM555 counting at a one second rate. Have the counter reset at a count of 24.

so i will press the reset button on 24?

 

Something like this? I haven't built it yet but it should work.

This is the Chosen Circuit

 

so i will press the reset button on 24?

We add some gates on the output to pick off "24" and have that set a latch that pulls on the Reset line. example coming up.
(edited to add ...)
New version

 

We add some gates on the output to pick off "24" and have that set a latch that pulls on the Reset line. example coming up.
(edited to add ...)
New version

Cool, i might add that if the price total is not really high (parts in the philippines are cheap but only few electronics stores)
Add: how many volts do i need to power the whole circuit? i got lm7805 just in case it needs 5 volts

 

Cool, i might add that if the price total is not really high (parts in the philippines are cheap but only few electronics stores)
Add: how many volts do i need to power the whole circuit? i got lm7805 just in case it needs 5 volts

Yes, 5 V will be fine. All that is missing is a clock source. An LM555, or what ever. You didn't specify a frequency yet.

 

Cool, i might add that if the price total is not really high (parts in the philippines are cheap but only few electronics stores)
Add: how many volts do i need to power the whole circuit? i got lm7805 just in case it needs 5 volts

Built it. Made a small change. carry out of the lower chip goes to Carry In of the next higher stage and Clock lines are tied together.
A 1 second oscillator is shown in another drawing.
Just a note. he display used in Design 770 is a TIL309. It is a CD4511 and 7-segment display all in one chip. Design 770 draws about 150 mA. I would expect 768 to draw about the same.

 

Yes, 5 V will be fine. All that is missing is a clock source. An LM555, or what ever. You didn't specify a frequency yet.

I want it to count like a normal clock/ the normal speed (i dont know how to explain it)
But i think 1 hertz? because i think 1 hertz is 1 second

 

Built it. Made a small change. carry out of the lower chip goes to Carry In of the next higher stage and Clock lines are tied together.
A 1 second oscillator is shown in another drawing.
Just a note. he display used in Design 770 is a TIL309. It is a CD4511 and 7-segment display all in one chip.

Why does the til309 have no a,b,c,d,e,f,g pins? Like to connect to the display?
Or you are saying that til309 is the display itself

 

Hello,

The TIL309 is a display with a build in decoder.

Bertus

 

Hello,

The TIL309 is a display with a build in decoder.

Bertus

Cool tnx for the info

 

Why does the til309 have no a,b,c,d,e,f,g pins? Like to connect to the display?
Or you are saying that til309 is the display itself

Those lines are only used inside the TIL309. You can identify the inputs like the CD4511, the other four outputs are the latched data lines, not apparent on the 4511. Data sheet attached.
If you want a 4511-type device that does hexadecimal numbers there is a 4311, made by Tesla I think.

 

μ

Those lines are only used inside the TIL309. You can identify the inputs like the CD4511, the other four outputs are the latched data lines, not apparent on the 4511. Data sheet attached.
If you want a 4511-type device that does hexadecimal numbers there is a 4311, made by Tesla I think.

I will delete the file you attached, because the file that bertus already uploaded, and his file has 8 page, but your only 7 page, what do you think?

 

μ

I will delete the file you attached, because the file that bertus already uploaded, and his file has 8 page, but your only 7 page, what do you think?

Re: delete the file
No problem

 

Thank you all guys for the help but i willsimulate the circuit in multisim tomorrow

 

IF you wish to have a precisely 1Hz square wave oscillator, the circuit as the followings.

 

Something like this? I haven't built it yet but it should work.

This is the Chosen Circuit

There are two different circuits for cascading these counters in the datasheet, but this circuit is not either one of them. The circuit in post #16 should work.

ak

 

i want it to count up and down using a button

One button for up and one button for down, or one button for count and one switch for up/down? There are counters in the 7416x series for either case. Also:

HCC/HCF40192
HCC/HCF4029

ak

 

Hello guys my name is John Paul, do guys have any idea how to make a 0-99 up/down counter with a common cathode display?
also can you tell me guys where to put a schmitt trigger to prevent button bouncing?


i cant find a 0-99 counter using IC 4510 and 4511 or IC 7490 and 7447
i want it to count up and down using a button
and i cant find any simple schmitt trigger circuit

Any Help would be very Appreciated

The 7490 suggested by someone else is discontinued, the new part is a dual BCD counter - I think the number is something like 74290.

Its not an up/down counter - you may have to select a binary up/down counter and decode it to BCD yourself.

You could always cheat and track down some hexadecimal decoder drivers to use with binary counters.........

In this circuit, a Schmitt trigger won't help with switch bounce - you need a couple of 2-input gates wired as an S/R flip-flop and drive the 2 inputs with a SPDT switch.