hey guys please i need help for my project i need to make a split timer using electronics circuits and logic circuits . I'm using a NE 555 to to make my clock signal and i need to use 74LS160 and a 74LS47/48 decoder and a digital 7 segment th split timer should count to 1/10 seconds also so i need it to count to 9 min 59 sec and 9 tenth's of secs then reset my problem is i'm not able figure out the schematic thanks for your future help

 

I don't believe a 555 will produce the accuracy you need. This seems like a project that needs a crystal time base. A PIC approach would be my choice.

 

thanks for the reply but unfortunately my professor demanded the usage of a 555 and no microprocessors :S can i get any more help ?

 

If your professor can create a 555 circuit that can produce this kind of repeatable accuracy.... Wait, I'll rephrase.. If he can produce it once, he is either a genius or a magician.

 

well i know i"m not a fan of using 555 but i'm obliged to :S thanks fort your help . another thing how can i make my BCD counter be a module 6 counter ? and the frequency of the 555 must be different for each counter rigth ( if yes any suggestions ) thanks

 

You can always use trim pots to try to get the 555 frequency to 10 Hz.

As to the counter, notice that 6 in BCD is 0110. An external AND gate can see thase bits and short count the 'LS160. If you have a data sheet for the IC's, you can see how to do the put them together for longer counting periods. Use the device number as a search term.