0-99 Counter with J-K Flip Flop 74LS107A

eetech00

Joined Jun 8, 2013
3,161
Hi, I need to simulate on a virtual breaboard a 0-99 counter. I need to build it using a 7 segment led display, 74LS47 decoder and a 74LS107A JK flip flop.
I allready build it but doesnt work at all.
View attachment 267031

I would thanks a lot any help and advice.
https://drive.google.com/file/d/1CknBidqndFYUbM9RIbkduGF7dfmv19UK/view This is the program Im using right now.
Post a schematic so we don't have to figure out your wiring.
You'll get quicker help that way...
 

Thread Starter

Polipker

Joined May 11, 2022
9
Hi. I followed these schematic below, with different TTL but still JK flip flop so I touhgt it would still work. Ill post here everything I used.
Contador 0 99 JK.JPG
1652380569641.png



1652380828608.png

Thanx for yor answers!
 

MrChips

Joined Oct 2, 2009
26,133
Welcome to AAC!

There are some inconsistencies. In your protoboard layout. I see 74LS47 and no 555-timer circuit.
In your circuit diagram I see CD4511.

I don't see any connections to pins 3, 4, 5 on the 74LS47. Make sure LAMP TEST input on pin-3 is at Vcc.

There are simple signal tracing you can do on your own. Use a 1kΩ resistor in series with an LED and use this as a signal probe.
Start with tracing the 555-timer clock signal at a low frequency of about 1Hz.
Trace the signal to your flip-flop and the DCBA inputs of the 74LS47.

Buena suerte!
 

Thread Starter

Polipker

Joined May 11, 2022
9
Welcome to AAC!

There are some inconsistencies. In your protoboard layout. I see 74LS47 and no 555-timer circuit.
In your circuit diagram I see CD4511.

I don't see any connections to pins 3, 4, 5 on the 74LS47. Make sure LAMP TEST input on pin-3 is at Vcc.

There are simple signal tracing you can do on your own. Use a 1kΩ resistor in series with an LED and use this as a signal probe.
Start with tracing the 555-timer clock signal at a low frequency of about 1Hz.
Trace the signal to your flip-flop and the DCBA inputs of the 74LS47.

Buena suerte!
Hi thanks for answering! The diagram with CD4511 its not mine. Its the One I used yo figure it out how to do It. Also the program I have ti use its limited and doesnt have any kind of resistor. I'll check out the rest thanks!
 

MrChips

Joined Oct 2, 2009
26,133
Hi thanks for answering! The diagram with CD4511 its not mine. Its the One I used yo figure it out how to do It. Also the program I have ti use its limited and doesnt have any kind of resistor. I'll check out the rest thanks!
Can you test this with a real circuit?
 

MrChips

Joined Oct 2, 2009
26,133
On your first 74LS107 stage what is the CLOCK input?
Does your simulator have some kind of square wave function generator?
 
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