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ljcox said:Modulo 6 means that the counter counts from 0 to 5, ie. 6 ststes.
It and a decade counter are required to count the seconds.
There will be some complications if you want to include the Thumb Wheel for the seconds. But it is not impossible.
johnsoax said:ljcox said:Modulo 6 means that the counter counts from 0 to 5, ie. 6 states.
It and a decade counter are required to count the seconds.
There will be some complications if you want to include the Thumb Wheel for the seconds. But it is not impossible.
Why do it that way and not just use the same counter but input seconds as its clock and make it count from 0-9?
ljcox said:Because you need to count from 0 to 59 (or vice versa if you want it to count down) for the seconds. So you need a decade counter and a Modulo 6.
The minutes counter counts from 99 to 0, not 59 to 0. You would need it to count from 59 to 0 if you wanted to include an Hours counter also.
ljcox said:Alex,
No you don't understand the meaning of Modulo. Modulo is used for numbering systems.
Some examples:- binary is Modulo 2 (it has only 2 digits 0 & 1), Modulo 10 is the decimal system (digits 0 to 9), Modulo 16 is the Hexadecimal system (digits 0 to F).
ljcox said:Why do you want to use relays? CMOS logic would be more energy efficient and require less space.
If you want to use relays, you can make some savings. Relays R0 and R1 are not necessary. the "Zero" signal can drive R3 directly and the "One" signal can drive R2 directly. When I say directly, I mean it in a logical sense. You will need 2 transistors to physically drive the relays.
There you got me, I decided not to install a fifth relay tied into the start button to keep the relay count down.ljcox said:The Green LED will be on continuously until R2 operates. You wanted it to light when the Start button was pressed.
And that is because I put the reset button in the wrong place.ljcox said:If R2 operates but the circuit is reset before R3 operates, R2 will remain operated.