| Author |
Message |
gie_b_hsb
Joined: 30 Oct 2006
Posts: 23
|
 14 Dec 2006 11:24 changing digits sevent segment |
|
|
|
please help me everybody , how to convert or change digits number from 9.99.999 to 9.59.999, this digits i used on the counter circuit, i used six HCC40110B (DECADE UP-DOWN COUNTER/DECODER/LATCH/DRIVER)......
thank's for all your hepl.
rgrds,
gie
|
|
| Back to top |
|
 |
izua
Joined: 31 Oct 2006
Posts: 63
Helped: 2
|
| 14 Dec 2006 14:38 Re: changing digits sevent segment |
|
|
|
is this for something like a clock circuit?
I don't know exactly the specifications of that IC, but you can make the second digit of minutes/seconds reset when it reaches 6. You can do it with logic gates, for example..
|
|
| Back to top |
|
|
gie_b_hsb
Joined: 30 Oct 2006
Posts: 23
|
| 15 Dec 2006 1:54 Re: changing digits sevent segment |
|
|
|
| yes, it's a clock circuit? can you give to me modificaton.....?
|
|
| Back to top |
|
|
IanP
Joined: 05 Oct 2004
Posts: 6346
Helped: 1505
Location: West Coast
|
| 15 Dec 2006 2:17 Re: changing digits sevent segment |
|
|
|
One option is to connect segments F, E, D, C and G of the second digit to 8-input NAND gate (the remaining 3 inputs connected to +5V) followed by a timer which, when trigged, will generate a short reset pulse ..
8-input NAND => CD4068 (CMOS) or 7430(TTL) ..
timer => CD4528(CMOS) or 74121(TTL) ..
Regards,
IanP
|
|
| Back to top |
|
|
MAKeller
Joined: 26 Mar 2003
Posts: 15
Helped: 2
|
| 15 Dec 2006 4:03 Re: changing digits sevent segment |
|
|
|
Gie,
The easiest way to this is to use a couple of diodes.
Arrange them so they form a nand gate and use them
to reset the main counter.
MAKeller
|
|
| Back to top |
|
|
IanP
Joined: 05 Oct 2004
Posts: 6346
Helped: 1505
Location: West Coast
|
| 15 Dec 2006 6:30 Re: changing digits sevent segment |
|
|
|
I don't think you can generate a short reset pulse with just a couple of diodes ..
You need more than that .. see attached example ..
Regards,
IanP
|
|
| Back to top |
|
|
Borber
Joined: 01 Jan 1970
Posts: 1485
Helped: 111
|
| 15 Dec 2006 7:43 Re: changing digits sevent segment |
|
|
|
Or try something like this:
|
|
| Back to top |
|
|
MAKeller
Joined: 26 Mar 2003
Posts: 15
Helped: 2
|
| 15 Dec 2006 14:23 Re: changing digits sevent segment |
|
|
|
Ian,
I have to agree with Borber, you CAN make a
NAND gate out with just a few diodes.
MAKeller
|
|
| Back to top |
|
|
budhy
Joined: 21 Oct 2006
Posts: 837
Helped: 185
Location: Indonesia
|
| 17 Dec 2006 4:54 Re: changing digits sevent segment |
|
|
|
Be careful with CARRY (pin 10) - CLK UP (pin 9) connection from CD40110 B to 40110 A, reset (pin 5) 40110 B will not count up 40110 A!
See the complete circuit below
|
|
| Back to top |
|
|
gie_b_hsb
Joined: 30 Oct 2006
Posts: 23
|
| 18 Dec 2006 5:24 Re: changing digits sevent segment |
|
|
|
for all everybody i'm very many thank's for your solution, i think's i should be trying one by one...so that i can finding which match.....
rgrds,
gie
|
|
| Back to top |
|
|
