I want to experiment with digital electronics but i have a problem When im experimenting with SN74LS283N. It does not matter how i connect the circuit but it always the red l.e.d on the carry glows but When i press the Buttons nothing happends. What did i do wrong?

 

You don't have the pin numbers on your diagram. This is a SERIOUS mistake. How can you check your wiring against the schematic. Is the carry pin on the left side of your symbol an input or an output?
Two more things:

1. LS TTL inputs source current. DON'T use pulldown resistors. Pulldown resistors only work reliably for CMOS devices.
2. LS TTL outputs will sink way more current than they can source. Do not attempt to drive grounded loads with an LS TTL output!

 

You don't have the pin numbers on your diagram. This is a SERIOUS mistake. How can you check your wiring against the schematic. Is the carry pin on the left side of your symbol an input or an output?
Two more things:

1. LS TTL inputs source current. DON'T use pulldown resistors. Pulldown resistors only work reliably for CMOS devices.
2. LS TTL outputs will sink way more current than they can source. Do not attempt to drive grounded loads with an LS TTL output!

Thx a lot for the advice i did not know that!

 

You don't have the pin numbers on your diagram. This is a SERIOUS mistake. How can you check your wiring against the schematic. Is the carry pin on the left side of your symbol an input or an output?
Two more things:

1. LS TTL inputs source current. DON'T use pulldown resistors. Pulldown resistors only work reliably for CMOS devices.
2. LS TTL outputs will sink way more current than they can source. Do not attempt to drive grounded loads with an LS TTL output!

This is a good answer. Worth sharing too for others to see.

 

I want to experiment with digital electronics but i have a problem When im experimenting with SN74LS283N. It does not matter how i connect the circuit but it always the red l.e.d on the carry glows but When i press the Buttons nothing happends. What did i do wrong?View attachment 127657View attachment 127658View attachment 127659

Try this:

 

PIN NUMBERS?!!?

 

PIN NUMBERS?!!?

As you note, "Life is too short to sweat the small stuff."
The notations on the drawing serve to identify the chip's logic functions which is, in my opinion, all that's required for a conceptual disclosure.

If someone needs to identify the chip's pinout in order to, say, actually build the circuit, then the legwork is on the builder and there are data sheets with that data available for the asking.

 

As you note, "Life is too short to sweat the small stuff."
The notations on the drawing serve to identify the chip's logic functions which is, in my opinion, all that's required for a conceptual disclosure.

If someone needs to identify the chip's pinout in order to, say, actually build the circuit, then the legwork is on the builder and there are data sheets with that data available for the asking.

You remind me of those authors who say: "The details are left as an exercise for the reader". It is just a matter of having a capture program that gives you what you want. Even when I used hand drawn schematics I always put the pin numbers on so I wouldn't have to go hunt up a datasheet or a databook. That was in the days before the internet, and I guess old habits die hard.

 

Try this:
View attachment 127730

THANK YOU IT WORKS!!!

 

THANK YOU IT WORKS!!!

Music to my ears!
You're welcome.