broke my own circuit - 4017 decade/Johnson counter

D

DewDude

Guest
so im building a simple light chaser circuit out of a 4017 counter and
555 timer. the 555 timer circuit works. my problem is with thr 4017.

according to several schematics ive seen...and behavior in electronics
workbench/multisim, connecting the reset to output q4 causes the chip
to reset when q4 fires.

real-life behavior i different. if reset is connected to anything
except just ground, all it'll do is blink the first led.

any suggestions?
 
"DewDude" <dewdude@gmail.com> wrote in message
news:da4cb5a9-8d74-4143-b3ee-68d91454a243@q35g2000prh.googlegroups.com...
so im building a simple light chaser circuit out of a 4017 counter and
555 timer. the 555 timer circuit works. my problem is with thr 4017.

according to several schematics ive seen...and behavior in electronics
workbench/multisim, connecting the reset to output q4 causes the chip
to reset when q4 fires.

real-life behavior i different. if reset is connected to anything
except just ground, all it'll do is blink the first led.

any suggestions?
Click to expand...
You're resetting from the wrong end of the counter.
 
"DewDude" <dewdude@gmail.com> wrote in message
news:dc3cca40-a86f-4a86-b1fa-9752d2d1dc79@d33g2000prb.googlegroups.com...
On Oct 26, 3:39 pm, "Ian Field" <gangprobing.al...@ntlworld.com>
wrote:
"DewDude" <dewd...@gmail.com> wrote in message

news:da4cb5a9-8d74-4143-b3ee-68d91454a243@q35g2000prh.googlegroups.com...

so im building a simple light chaser circuit out of a 4017 counter and
555 timer. the 555 timer circuit works. my problem is with thr 4017.

according to several schematics ive seen...and behavior in electronics
workbench/multisim, connecting the reset to output q4 causes the chip
to reset when q4 fires.

real-life behavior i different. if reset is connected to anything
except just ground, all it'll do is blink the first led.

any suggestions?

You're resetting from the wrong end of the counter.
Click to expand...
i dont see how. the counter will start with output q0....it
automatically cycles back to q0 after firing q9, the reset is supposed
to allow me to recycle back to q0 after firing a specific number of
leds.

explain your reasoning or stfu.

vvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvv

I had another suggestion but since you're an offensive little cunt I won't
bother.
 
On Oct 26, 3:39 pm, "Ian Field" <gangprobing.al...@ntlworld.com>
wrote:
"DewDude" <dewd...@gmail.com> wrote in message

news:da4cb5a9-8d74-4143-b3ee-68d91454a243@q35g2000prh.googlegroups.com...

so im building a simple light chaser circuit out of a 4017 counter and
555 timer. the 555 timer circuit works. my problem is with thr 4017.

according to several schematics ive seen...and behavior in electronics
workbench/multisim, connecting the reset to output q4 causes the chip
to reset when q4 fires.

real-life behavior i different. if reset is connected to anything
except just ground, all it'll do is blink the first led.

any suggestions?

You're resetting from the wrong end of the counter.
Click to expand...
i dont see how. the counter will start with output q0....it
automatically cycles back to q0 after firing q9, the reset is supposed
to allow me to recycle back to q0 after firing a specific number of
leds.

explain your reasoning or stfu.
 
On 10/26/2011 3:36 PM, Ian Field wrote:
I had another suggestion but since you're an offensive little
cunt I won't bother.
Click to expand...
Spot on sir. Too funny.

Jeff-1.0


--
"Everything from Crackers to Coffins"
 
DewDude wrote:

so im building a simple light chaser circuit out of a 4017 counter and
555 timer. the 555 timer circuit works. my problem is with thr 4017.

according to several schematics ive seen...and behavior in electronics
workbench/multisim, connecting the reset to output q4 causes the chip
to reset when q4 fires.

real-life behavior i different. if reset is connected to anything
except just ground, all it'll do is blink the first led.

any suggestions?
I just looked at the PDF on that chip. It looks to me that you need to
Click to expand...
directly connect the Q4 output, if that is the one you want to use?
directly to MR input.

If you have a scope, make sure you are making your minimum levels.
Also, you may want to put a rail cap at Vdd. Make sure your supply
rails are steady.

Jamie
 
DewDude wrote:

On Oct 26, 3:39 pm, "Ian Field" <gangprobing.al...@ntlworld.com
wrote:

"DewDude" <dewd...@gmail.com> wrote in message

news:da4cb5a9-8d74-4143-b3ee-68d91454a243@q35g2000prh.googlegroups.com...


so im building a simple light chaser circuit out of a 4017 counter and
555 timer. the 555 timer circuit works. my problem is with thr 4017.

according to several schematics ive seen...and behavior in electronics
workbench/multisim, connecting the reset to output q4 causes the chip
to reset when q4 fires.

real-life behavior i different. if reset is connected to anything
except just ground, all it'll do is blink the first led.

any suggestions?

You're resetting from the wrong end of the counter.


i dont see how. the counter will start with output q0....it
automatically cycles back to q0 after firing q9, the reset is supposed
to allow me to recycle back to q0 after firing a specific number of
leds.

explain your reasoning or stfu.
Ah LEDS, I bet you are loading down the line! :)
Click to expand...

Insufficient levels.

Jamie
 
DewDude wrote:
explain your reasoning or stfu.
Click to expand...

This isn't a gay dating newsgroup, so go away.


--
You can't have a sense of humor, if you have no sense.
 
On Wed, 26 Oct 2011 13:12:54 -0700 (PDT), DewDude <dewdude@gmail.com>
wrote:

On Oct 26, 3:39 pm, "Ian Field" <gangprobing.al...@ntlworld.com
wrote:
"DewDude" <dewd...@gmail.com> wrote in message

news:da4cb5a9-8d74-4143-b3ee-68d91454a243@q35g2000prh.googlegroups.com...

so im building a simple light chaser circuit out of a 4017 counter and
555 timer. the 555 timer circuit works. my problem is with thr 4017.

according to several schematics ive seen...and behavior in electronics
workbench/multisim, connecting the reset to output q4 causes the chip
to reset when q4 fires.

real-life behavior i different. if reset is connected to anything
except just ground, all it'll do is blink the first led.

any suggestions?

You're resetting from the wrong end of the counter.

i dont see how. the counter will start with output q0....it
automatically cycles back to q0 after firing q9, the reset is supposed
to allow me to recycle back to q0 after firing a specific number of
leds.

explain your reasoning or stfu.
PLONK
Click to expand...
 
On Wed, 26 Oct 2011 19:39:58 -0400, Jamie
<jamie_ka1lpa_not_valid_after_ka1lpa_@charter.net> wrote:

DewDude wrote:

so im building a simple light chaser circuit out of a 4017 counter and
555 timer. the 555 timer circuit works. my problem is with thr 4017.

according to several schematics ive seen...and behavior in electronics
workbench/multisim, connecting the reset to output q4 causes the chip
to reset when q4 fires.

real-life behavior i different. if reset is connected to anything
except just ground, all it'll do is blink the first led.

any suggestions?
I just looked at the PDF on that chip. It looks to me that you need to
directly connect the Q4 output, if that is the one you want to use?
directly to MR input.

If you have a scope, make sure you are making your minimum levels.
Also, you may want to put a rail cap at Vdd. Make sure your supply
rails are steady.
Click to expand...
and put a pull-down on the MR pin - I use that same configuration (Q6
in my case) and a 10K pull-down helps remove any transient crap off
the output pin that just *might* cause a reset.. YMMV
 
On 27/10/2011 7:12 AM, DewDude wrote:
explain your reasoning or stfu.
Click to expand...
That's a spectacularly foolish way of reacting in a newsgroup where
you're seeking help. Even those who are not the target of your response
are likely to take the view that you can go and play in the traffic.

Sylvia.
 
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