bcd counter

yeu

New Member

• Jan 25, 2009

• #1

i'm hard up in making the wiring diagram of the bcd counter... my instructor required us to make use of relays (not ic's)

any help will be very much appreciated. thanks!

 

R

rjvh

New Member

• Jan 26, 2009

• #2

bcd stands for what???


Robert-Jan

 

Boncuk

New Member

• Jan 26, 2009

• #3

rjvh said:

bcd stands for what???


Robert-Jan

Click to expand...

binary to decimal

 

P

PGrogan

New Member

• Jan 26, 2009

• #4

In fact, BCD stands for Binary Coded Decimal. For those who don't know what it is, (if there are some) each decimal digit is represented on 4 bits, (0 to 9) so if you want to represent 56, the byte will be 01010110.

 

Last edited: Jan 26, 2009

silvarblade

Member

• Jan 27, 2009

• #5

Thanks PGrogan! Very enlightening!Now lets get to the topic.Yeu ,why would your teacher tell you to make a counter with relays(if thats possible)??if it does work out it will have to use active components(surely) and will be useless!

 

blueroomelectronics

Well-Known Member

• Jan 27, 2009

• #6

Teacher must have gotten a bag of relays on eBay.

 

P

PGrogan

New Member

• Jan 27, 2009

• #7

I have two things to say :
1) How many relay do you have to make this BCD counter?
2) Good luck! I tried to figure it myself. The first thing to know is how to maintain when an impulse arrive. To do this, you need one more relay on each section (see my figure). The seconde thing to do is the be able to make the relay switch AND maintain on impulse. The third thing is to make an adder with this!

The figure shows two relays with one as an auto-maintain relay. When the button is pushed, the first relay close and make the circuit close between Vcc and ground. As it is done, the second relay makes another road to ground. So, when the button is released, the second relay remain close.

(sorry for my bad english)

 

Attachments

• auto-maintain.PNG

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yeu

New Member

• Jan 27, 2009

• #8

20 relays. i'm mad i have been trying to figure it out for a couple of days.

 

silvarblade

Member

• Jan 28, 2009

• #9

I do get the retaining part but what if we want to open it?except restarting it.

 

P

PGrogan

New Member

• Jan 28, 2009

• #10

That is the problem! I did not find any solution using relays only... maybe adding a NC relay on the left leg that will cut the link to ground... but I don't think it will work...

 

blueroomelectronics

Well-Known Member

• Jan 28, 2009

• #11

With 415 Relays you can make Harry Porter's Relay Computer. Pretty sure it can do BCD conversion.
**broken link removed**

 

ericgibbs

Well-Known Member

Most Helpful Member

• Jan 28, 2009

• #12

yeu said:

20 relays. i'm mad i have been trying to figure it out for a couple of days.

Click to expand...

hi,
Look at the first item on this link. The *.pdf is 8meg

**broken link removed**