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BCD COUNTER and 7 SEGMENT DISPLAY

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kenjhe

New Member
Hello,

I'm doing this lab BCD COUNTER and 7 SEGMENT DISPLAY and im using CD4510BMS presettable BCD Up/Down Counter. I was able to do the counting from 00-99 but i can't figure out the counting from 32-84. Do i need another gate for this operation?

Can someone PLEASE help me with my lab?!

What gate do i need to use and what are the connections?

Just leave your comment/reply. I'm going to wait for it.

Thank you,
kenjhe
 

crutschow

Well-Known Member
Most Helpful Member
Don't understand. If it counts from 00-99, than how can it not work for 32-84?

You have no links in your post. Post a schematic.
 

kenjhe

New Member
Okay, sorry about that. I need to start it from 32-84 and around again. Instead of starting 00-99, i need to advanced the count and shorten it too. For the schematic i dont have any scanner, so im not able to show it to you. If you know function similar from what my lab does, can you please send it to me?
 

crutschow

Well-Known Member
Most Helpful Member
You would use logic gates (AND, OR, NAND, NOR) to detect counts 32 and 84 and use the gate outputs to stop the count and/or reverse the count as desired.
 

kenjhe

New Member
ah ok..thats what im doin right now..so what really specific gate do i need to use to make it count from 32-84? im using nand gate right now im just figuring out what are the connections.
 

crutschow

Well-Known Member
Most Helpful Member
ah ok..thats what im doin right now..so what really specific gate do i need to use to make it count from 32-84? im using nand gate right now im just figuring out what are the connections.
For count 32 you must detect the binary count of 0011,0010 from your counter. For 84 you must detect binary count 1000,0100. You can do that with a series of INVERTER and NAND gates, or INVERTER and NOR gates. It depends upon the polarity output you require when you detect the number.

For example, to detect 32 with a logic high output, you could put inverters on bit 2, bit 5, and bit 6, and connect their outputs, along with the other 5, to an 8-input NOR gate. The output of the NOR gate will go high, when count 32 is detected (all NOR inputs low). It will remain low for all other counts.
 

kikilala

New Member
Hello, i'm also doing a 0-99 counter with IC 4511 and 4510. But my circuit wont work. However i press the clock pulse button, the number wont increase. Can anyone upload a schematic using 4510 and 4511 as the counter? I'm working on it for more than 5 hours already, still cant get any solution.



This is the schematic i found and it was posted two years ago in this forum too...
Pls, anyone pls help me...

Kiki
 

kikilala

New Member
This is a correction someone gave on that circuit. I have tried and still cannot work.

"It needs 100 nF capacitors across the counter IC supply line (one for each 4510), the Load, A, B, C & D inputs should be connected to gnd. And, if you want it to count up, connect the UP/DN inputs to +9 Volt.

The 4511 requires a Common Cathode 7 seg. LED display.

The Enable input of the 4511 should be connected to gnd.

CMOS inputs should not be left open. "

Kiki
 
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