# 8 bit binry to decimal circuit

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#### jbuluran02

##### New Member
hi i'm new on using 74158a ic,and i also have the same dillema of converting an 8bit binary number to decimal i wonder if you could help me anyhow?? i would greatly appreciate your help thanx in advance

#### jbuluran02

##### New Member
can you show me a complete diagram? tnx

#### Chippie

##### Member
can you show me a complete diagram? tnx

What would you learn from someone giving the answer.?

Try a little research and come back if you get stuck...

#### crutschow

##### Well-Known Member
Converting binary to bcd is rather tricky without a microprocessor. Here's a binary-to-bcd circuit from an old Fairchild TTL application manual. You may have to find equivalents for some of the parts if they are no longer made.

Another way to do a Binary-to-BCD conversion is to use a binary up/down counter and a BCD counter. The binary number is parallel jammed into the up/down counter. Then the counter is clocked to count down to zero. The same clock is used to clock the BCD counter up from zero. When the binary counter reaches zero, the BCD counter will contain the binary number in BCD format.
Edit: Note that the BCD (decade) counter can be one that directly drives a 7-segment display, such as the CD4033 or the CD40110B, if desired.

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#### yasialavi

##### New Member
hello,
i need 5-bit binary to BCD converter.
i know about it but i can not design 5-bit in proteus.
is there any one help me?

#### Dean Huster

##### Well-Known Member
TTL chips: 74184 BCD-to-binary converter; 74185 binary-to-BCD converter. Simple, easy, you don't need a µP -- trouble is, you probably aren't going to find them anymore since they've gone the way of the 74100.

Another way is to program an EPROM with a look-up table.

#### yasialavi

##### New Member
i do not know how to design it.
could you please send me the diagram of it?
i mean i do not understand it.
if it is possible send me the diagram of it
i will be thankful if you can help me

#### ericgibbs

##### Well-Known Member
i do not know how to design it.
could you please send me the diagram of it?
i mean i do not understand it.
if it is possible send me the diagram of it
i will be thankful if you can help me

hi,
Look at Carl's [crutschow] method using counters, thats nice and easy to do.

#### yasialavi

##### New Member
where is it?
i mean where i must to find it?

#### yasialavi

##### New Member
i must do it in protues with ic:74154 and 5 bit.
i can not design it.

#### blueroomelectronics

##### Well-Known Member
i must do it in protues with ic:74154 and 5 bit.
i can not design it.

Aren't you expected to do your own homework?

#### yasialavi

##### New Member
not at all.
i do not know how to do it only.
if my reply show it, i am so sorry!

#### crutschow

##### Well-Known Member
We are here to help you with a design, not do the design.

If you don't know how to build a circuit with IC counters then you need to learn about them before you start anything more complicated.

#### yasialavi

##### New Member
i am here to learn not ... . i need tohelp you if it is possible.
i want help me .
i do not know what i must to do.

#### blueroomelectronics

##### Well-Known Member
i am here to learn not ... . i need tohelp you if it is possible.
i want help me .
i do not know what i must to do.

I don't understand, are you saying you're here not to learn?

I take it this is a homework assignment.

#### yasialavi

##### New Member
no.
i am here to learn not i want you to do it.ok?

#### crutschow

##### Well-Known Member
Well, if you can con someone into doing your work for you, good luck.

#### blueroomelectronics

##### Well-Known Member
no.
i am here to learn not i want you to do it.ok?

LOL I have no desire to do your homework assignment.

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