Help please? need help with counters

Z

Zero

Guest
hi! im just wondering if anyone here knows how to make a counter chip (Code=
MC74F163A, motorola)
count from 1 to 12, rather than 0 to 15, with the use of logic gates.. im
having trouble with it, for some reason when i wire it to the outputs, all i
get in binary (shown through LEDS' lighting up) is the number 4 and 15 :/

help?
 
"Zero" <dgulli@SPAMBLOCKoptusnetSPAMBLOCK.com.auMYMIND> wrote in message
news:3f9c9a71$0$1089$afc38c87@news.optusnet.com.au...
hi! im just wondering if anyone here knows how to make a counter chip
(Code=
MC74F163A, motorola)
count from 1 to 12, rather than 0 to 15, with the use of logic gates.. im
having trouble with it, for some reason when i wire it to the outputs, all
i
get in binary (shown through LEDS' lighting up) is the number 4 and 15 :/

help?
Click to expand...

You'll want to preload the counter to 0001 by tying pins 3 high and 4,5,6
low
The chip enable inputs, pins 7 and 10 must be high. The master reset, pin
1 must be high. Your debounced clock is applied to pin 2. The terminal
count output won't be used.

Connect a 3 input NAND gate to output pins 11, 12 and 14. Connect the
output of the NAND to pin 9. When a binary 13 outputs, the NAND will
generate a low to the parallel enable which will stop the counting and
reload the counter to a binary 0001.

Don't forget to connect power !!!
 
"Lord Garth" <LGarth@Tantalus.net> wrote in message
news:un1nb.1081$Qn.777@newssvr24.news.prodigy.com...
"Zero" <dgulli@SPAMBLOCKoptusnetSPAMBLOCK.com.auMYMIND> wrote in message
news:3f9c9a71$0$1089$afc38c87@news.optusnet.com.au...
hi! im just wondering if anyone here knows how to make a counter chip
(Code=
MC74F163A, motorola)
count from 1 to 12, rather than 0 to 15, with the use of logic gates..
im
having trouble with it, for some reason when i wire it to the outputs,
all
i
get in binary (shown through LEDS' lighting up) is the number 4 and 15
:/

help?



You'll want to preload the counter to 0001 by tying pins 3 high and 4,5,6
low
The chip enable inputs, pins 7 and 10 must be high. The master reset, pin
1 must be high. Your debounced clock is applied to pin 2. The terminal
count output won't be used.

Connect a 3 input NAND gate to output pins 11, 12 and 14. Connect the
output of the NAND to pin 9. When a binary 13 outputs, the NAND will
generate a low to the parallel enable which will stop the counting and
reload the counter to a binary 0001.

Don't forget to connect power !!!
Click to expand...
great! thanx a lot for that. ill try that.. but ive got to make a 3 input
nand gate now lol.. :/ (or buy one) any idea how to do that?
 
"Zero" <dgulli@SPAMBLOCKoptusnetSPAMBLOCK.com.auMYMIND> wrote in message
news:3f9cb0e4$0$28121$afc38c87@news.optusnet.com.au...
"Lord Garth" <LGarth@Tantalus.net> wrote in message
news:un1nb.1081$Qn.777@newssvr24.news.prodigy.com...

"Zero" <dgulli@SPAMBLOCKoptusnetSPAMBLOCK.com.auMYMIND> wrote in message
news:3f9c9a71$0$1089$afc38c87@news.optusnet.com.au...
hi! im just wondering if anyone here knows how to make a counter chip
(Code=
MC74F163A, motorola)
count from 1 to 12, rather than 0 to 15, with the use of logic gates..
im
having trouble with it, for some reason when i wire it to the outputs,
all
i
get in binary (shown through LEDS' lighting up) is the number 4 and 15
:/

help?



You'll want to preload the counter to 0001 by tying pins 3 high and
4,5,6
low
The chip enable inputs, pins 7 and 10 must be high. The master reset,
pin
1 must be high. Your debounced clock is applied to pin 2. The terminal
count output won't be used.

Connect a 3 input NAND gate to output pins 11, 12 and 14. Connect the
output of the NAND to pin 9. When a binary 13 outputs, the NAND will
generate a low to the parallel enable which will stop the counting and
reload the counter to a binary 0001.

Don't forget to connect power !!!




great! thanx a lot for that. ill try that.. but ive got to make a 3 input
nand gate now lol.. :/ (or buy one) any idea how to do that?


nevermind.. i know how to do that :)
Click to expand...
 
"Zero" <dgulli@SPAMBLOCKoptusnetSPAMBLOCK.com.auMYMIND> wrote in message
news:3f9cb0e4$0$28121$afc38c87@news.optusnet.com.au...
"Lord Garth" <LGarth@Tantalus.net> wrote in message
news:un1nb.1081$Qn.777@newssvr24.news.prodigy.com...

"Zero" <dgulli@SPAMBLOCKoptusnetSPAMBLOCK.com.auMYMIND> wrote in message
news:3f9c9a71$0$1089$afc38c87@news.optusnet.com.au...
hi! im just wondering if anyone here knows how to make a counter chip
(Code=
MC74F163A, motorola)
count from 1 to 12, rather than 0 to 15, with the use of logic gates..
im
having trouble with it, for some reason when i wire it to the outputs,
all
i
get in binary (shown through LEDS' lighting up) is the number 4 and 15
:/

help?



You'll want to preload the counter to 0001 by tying pins 3 high and
4,5,6
low
The chip enable inputs, pins 7 and 10 must be high. The master reset,
pin
1 must be high. Your debounced clock is applied to pin 2. The terminal
count output won't be used.

Connect a 3 input NAND gate to output pins 11, 12 and 14. Connect the
output of the NAND to pin 9. When a binary 13 outputs, the NAND will
generate a low to the parallel enable which will stop the counting and
reload the counter to a binary 0001.

Don't forget to connect power !!!




great! thanx a lot for that. ill try that.. but ive got to make a 3 input
nand gate now lol.. :/ (or buy one) any idea how to do that?
Click to expand...
First, it is available as a package or you can make it out other gate.
Do you know DeMorgans equivalent yet? If you start with an AND
gate and add an inverter to the output, you create a NAND. If you add
inverters to the inputs of an AND gate, you create a NOR gate. If you
add inverters to the inputs and output of a AND gate, you create an OR
gate.

AND ------> NAND
| |
| |
NOR ------> OR

I think I'll let you ponder that for a while...
 
"Lord Garth" <LGarth@Tantalus.net> wrote in message
news:BF2nb.1099$Jk1.1@newssvr24.news.prodigy.com...
"Zero" <dgulli@SPAMBLOCKoptusnetSPAMBLOCK.com.auMYMIND> wrote in message
news:3f9cb0e4$0$28121$afc38c87@news.optusnet.com.au...

"Lord Garth" <LGarth@Tantalus.net> wrote in message
news:un1nb.1081$Qn.777@newssvr24.news.prodigy.com...

"Zero" <dgulli@SPAMBLOCKoptusnetSPAMBLOCK.com.auMYMIND> wrote in
message
news:3f9c9a71$0$1089$afc38c87@news.optusnet.com.au...
hi! im just wondering if anyone here knows how to make a counter
chip
(Code=
MC74F163A, motorola)
count from 1 to 12, rather than 0 to 15, with the use of logic
gates..
im
having trouble with it, for some reason when i wire it to the
outputs,
all
i
get in binary (shown through LEDS' lighting up) is the number 4 and
15
:/

help?



You'll want to preload the counter to 0001 by tying pins 3 high and
4,5,6
low
The chip enable inputs, pins 7 and 10 must be high. The master reset,
pin
1 must be high. Your debounced clock is applied to pin 2. The
terminal
count output won't be used.

Connect a 3 input NAND gate to output pins 11, 12 and 14. Connect the
output of the NAND to pin 9. When a binary 13 outputs, the NAND will
generate a low to the parallel enable which will stop the counting
and
reload the counter to a binary 0001.

Don't forget to connect power !!!




great! thanx a lot for that. ill try that.. but ive got to make a 3
input
nand gate now lol.. :/ (or buy one) any idea how to do that?

First, it is available as a package or you can make it out other gate.
Do you know DeMorgans equivalent yet? If you start with an AND
gate and add an inverter to the output, you create a NAND. If you add
inverters to the inputs of an AND gate, you create a NOR gate. If you
add inverters to the inputs and output of a AND gate, you create an OR
gate.

AND ------> NAND
| |
| |
NOR ------> OR

I think I'll let you ponder that for a while...
Click to expand...
hehe yeh i clicked just after i asked actually. im a bit stumped about the
fact i have a 4 output counter.. but ya said to connect only 3 of the
outputs to the nand gate circuit? what about pin 13?
 
"Zero" <dgulli@SPAMBLOCKoptusnetSPAMBLOCK.com.auMYMIND> wrote in message
news:3f9cb7da$0$497$afc38c87@news.optusnet.com.au...

hehe yeh i clicked just after i asked actually. im a bit stumped about the
fact i have a 4 output counter.. but ya said to connect only 3 of the
outputs to the nand gate circuit? what about pin 13?
Click to expand...
The binary for 13 is 1101 the only other count that could activate the
NAND is 1111 but that is a higher number and the counter gets reset to
0001 before that count. So while you could decode the 0 bit, it is a
waste to do so.
 
"Lord Garth" <LGarth@Tantalus.net> wrote in message
news:O43nb.1100$7O1.578@newssvr24.news.prodigy.com...
"Zero" <dgulli@SPAMBLOCKoptusnetSPAMBLOCK.com.auMYMIND> wrote in message
news:3f9cb7da$0$497$afc38c87@news.optusnet.com.au...


hehe yeh i clicked just after i asked actually. im a bit stumped about
the
fact i have a 4 output counter.. but ya said to connect only 3 of the
outputs to the nand gate circuit? what about pin 13?


The binary for 13 is 1101 the only other count that could activate the
NAND is 1111 but that is a higher number and the counter gets reset to
0001 before that count. So while you could decode the 0 bit, it is a
waste to do so.




ha.. didnt even think of that. your amazing! :)
Click to expand...
 
"Zero" <dgulli@SPAMBLOCKoptusnetSPAMBLOCK.com.auMYMIND> wrote in message
news:3f9cc165$0$28122$afc38c87@news.optusnet.com.au...
"Lord Garth" <LGarth@Tantalus.net> wrote in message
news:O43nb.1100$7O1.578@newssvr24.news.prodigy.com...

"Zero" <dgulli@SPAMBLOCKoptusnetSPAMBLOCK.com.auMYMIND> wrote in message
news:3f9cb7da$0$497$afc38c87@news.optusnet.com.au...


hehe yeh i clicked just after i asked actually. im a bit stumped about
the
fact i have a 4 output counter.. but ya said to connect only 3 of the
outputs to the nand gate circuit? what about pin 13?


The binary for 13 is 1101 the only other count that could activate the
NAND is 1111 but that is a higher number and the counter gets reset to
0001 before that count. So while you could decode the 0 bit, it is a
waste to do so.




ha.. didnt even think of that. your amazing! :)
Click to expand...
Okay, it's morning again and I'm up...Let hear back from you about how this
counter works for you. Another thing that you need to consider is the
addition
of a despiking cap physically very close to the Vdd & Vss (Vcc & Gnd) pins
of the counter. .1 uF would be fine.

What are you building?
 
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