Just download the IC datasheets for the pin diagrams. Prefix SN to make the google search easier. SN7492, SN7447 etc...

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You should check out my binary clock (works awesome, uses up quite alot of milliamps (about 500), so it is kind of pointless to run it battery power. I should switch it over to wall plug in

Mine was a ton of work, but is really cool. The attachments are the pictures of it. (wrong Computer profile, cant access my pictures )

Attached Thumbnails

 

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zhdsdf

Try to Google for data sheets, most of these are standard TTL IC's, otherwise try to get hold of the TTL Cookbook from Don Lancaster.

Cheers, Raymond

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hi.
thanks for your answer.but I relinquished them.anymore it isn't my project.

 

aw, you would have had fun with it like my clock

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Ok here are some photo's of the diagrammes to make it easier for our members who can not find these TTL IC details.

This info is from my TTL Cookbook which i bought years and years ago, but occasionally these are for sale on Ebay.

Info for the 7400, 7408, 7447, 7490, 7492 and 74160 attached.

There are very good PDF files on the internet available as long the LS or SN is put in the search engine ( 74LSxx ) or ( SN 74xx )

Hope this wil help,

Regards, Raymond

edited to improve picture details

Attached Thumbnails

         

   

__________________
There are more ways to get to Rome.

Electricity, Electric clocks, Meters and Trains are great.

Please don't sent me private messages, I will not answer them.
The questions asked can be discussed in the open forums.
http://www.youtube.com/user/RODALCO2007 some interesting electrical stuff to watch.

 

I've got those somewhere, Don Lancasters books were great.
http://www.tinaja.com/

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thanks for reply.............
i think now i will be able to solve my problem.......
thanks to alll

 

hello guys...im a newbie here...

i need ur help, i've been making my own digital clock using this diagram...


i already connected the minute and second digits and its working, but the problem is that it doesnt start at 00:00 rather 15:14...pls help me guys...

and if anyone knows how to add a set and reset button...

i appreciate ur help guys, thnx in advance...


and BTW, ive also tried the schema posted by rodalco but i can't understand the labels on the 7490...if its R0(1),R0(2),R90,R91...

i'd appreciate it if anyone can post a much more detailed schematic...

thnx guys...

 

I am not trying to discourage you, but actually its a clock, then you don't need to have the clock at 00:00 everytime you turn it on, since you already have fast and slow counter to set your clock.

Take a look at the 7490 datasheet for pinout here:

http://www.ee.washington.edu/stores/DataSheets/74ls/

cmiiw, to reset the Decade Counter, MR1 and MR2 pin set to Hi. Then it will give Lo output to Q0-Q3 which will make the 7447 set the 7segment to display 0. But it looks like your 10th hour can only display '1' and blank, not '0' and '1'.

good luck!

 

i am trying to build a digital clock without seconds. so i need to use a 555 to generate 60 hz and connect it to 7493 for minutes. but i could not design it. could any body help me pls.. thanks

 

It'll be very inaccurate as the 555 is not a good timebase. The CD4060 can handle a crystal which might make it better suited.

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ibriazici Just build the clock with the two 7490 IC's for the seconds but don't attach 7447 ic's and 7 segment displays to them.

A 555 is not accurate via a timeing cap as already said by blueroomelectronics.

zajioftheasuka, To get your clock to start at 00:00 you need to reset at all the R0 and R9 gates of the 7490 IC's.

__________________
There are more ways to get to Rome.

Electricity, Electric clocks, Meters and Trains are great.

Please don't sent me private messages, I will not answer them.
The questions asked can be discussed in the open forums.
http://www.youtube.com/user/RODALCO2007 some interesting electrical stuff to watch.

 

The circuit drawn is all with 7490 IC's, because these are easier to get, it may be why your circuit doesn't work.

A 7492 is a 2, 6 and 12 divider. The clock schema is different if you built it with these IC's and you don't need the 7400 gates to divide out the 6.
I see if I can find a 60 counter with those ic's.

__________________
There are more ways to get to Rome.

Electricity, Electric clocks, Meters and Trains are great.

Please don't sent me private messages, I will not answer them.
The questions asked can be discussed in the open forums.
http://www.youtube.com/user/RODALCO2007 some interesting electrical stuff to watch.

 

see howstuffworks.com. search

'How digital clocks work' (its heavy n ive got a dial up connection).
they have got a digital clock made with 7490. mod6 and mod10 u name it. with out the use of any gating circuitry.

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