Bi-stable Multivibrator

R

Ron M.

Guest
Need a flip/flop bistable with following features. Q and not Q must change states upon each positive input pulse. I have tried both a 4013 and 4027 but some crazy reason can't seem to get the desired results. I know it should be real simple but solution eludes me. HELP!!
 
On Wednesday, September 16, 2015 at 3:04:13 PM UTC-7, Ron M. wrote:
> Need a flip/flop bistable with following features. Q and not Q must change states upon each positive input pulse. I have tried both a 4013 and 4027 but...

Firstly, you need a logic-level 'input pulse' source. Then. you need to power the
flip/flop chip, with a bit of power supply bypass capacitance (.01 uF or more) near the chip.
Then, the unused inputs (Set, Reset, for both sections , and D and CLK for
the unused section) must be connected to keep them quiescent. Connecting
those all LOW will be fine.
Then, connect your input pulse to CLK and connect D to /Q for the active flip/flop
section of the CD4013.

That's not the complete list of things to worry about, but it's a good start.
 
On Wednesday, September 16, 2015 at 7:08:25 PM UTC-5, whit3rd wrote:
On Wednesday, September 16, 2015 at 3:04:13 PM UTC-7, Ron M. wrote:
Need a flip/flop bistable with following features. Q and not Q must change states upon each positive input pulse. I have tried both a 4013 and 4027 but...

Firstly, you need a logic-level 'input pulse' source. Then. you need to power the
flip/flop chip, with a bit of power supply bypass capacitance (.01 uF or more) near the chip.
Then, the unused inputs (Set, Reset, for both sections , and D and CLK for
the unused section) must be connected to keep them quiescent. Connecting
those all LOW will be fine.
Then, connect your input pulse to CLK and connect D to /Q for the active flip/flop
section of the CD4013.

That's not the complete list of things to worry about, but it's a good start.
Click to expand...

All those options have been tried including buffered outputs, different IC's, etc. Will keep digging. Almost to the point of just trying a discrete symmetrical bistable with appropriate out put sections.
 
In article <383d51ca-0e4a-421f-a115-1ebcc6f96d05@googlegroups.com>,
strmbrgr2@hotmail.com says...
Need a flip/flop bistable with following features. Q and not Q must change states upon each positive input pulse. I have tried both a 4013 and 4027 but some crazy reason can't seem to get the desired results. I know it should be real simple but solution eludes me. HELP!!
Click to expand...

put a pull down R on the clk input pin, something like a 5k to 10k etc..

connect the Data input to the Q/not output..

You may want a small cap on the clk input going to common to slow
down the respnse, otherwise it may look erratic.

This is assuming you are using some switch or jumper as the input
signal. (deboucing).

Never put more than the VCC/VDD supply voltage on the inputs

Jamie
 
On Wednesday, September 16, 2015 at 6:20:06 PM UTC-7, Ron M. wrote:
On Wednesday, September 16, 2015 at 7:08:25 PM UTC-5, whit3rd wrote:
On Wednesday, September 16, 2015 at 3:04:13 PM UTC-7, Ron M. wrote:
Need a flip/flop bistable with following features. Q and not Q must change states upon each positive input pulse. I have tried both a 4013 and 4027 but...

Firstly, you need a logic-level 'input pulse' source. Then...
connect D to /Q for the active flip/flop section of the CD4013.
Click to expand...

> All those options have been tried including buffered outputs, different IC's, etc.

The clock signal must have a fast risetime, going from under V/3 to over 2V/3 in
under 15 us (at 5V power); it has to stay high or low for 250 ns or more.

What DOES happen? What is the output state, and does it change? How are
you loading the outputs? Driving the inputs?
 
On Thursday, September 17, 2015 at 7:16:10 AM UTC-5, Bob Masta wrote:
On Wed, 16 Sep 2015 15:04:09 -0700 (PDT), "Ron M."
strmbrgr2@hotmail.com> wrote:

Need a flip/flop bistable with following features. Q and not Q must change> > states upon each positive input pulse. I have tried both a 4013 and 4027 b> >ut some crazy reason can't seem to get the desired results. I know it shoul> >d be real simple but solution eludes me. HELP!!

Hmm, you wouldn't by any chance be breadboarding this on one
of those white plastic proto-boards with a bazillion little
sockets on 0.1 inch spacing, would you?

If so, besides what others have suggested, try adding a 10k
series resistor to the clock line of your 4013. Many years
ago I had exactly your problem, until I eventually stumbled
onto the magical 10k resistor trick.

You don't need it when you actually build the circuit on PC
board, only when all the chip lines are cross-coupled by the
capacitances between the proto-board connectors. Slowing
down the rise time just a smidge with the 10k seems to do
the trick.

Best regards,


Bob Masta
I think you nailed it. The proto board is rather large due to amount of circuitry I have associated with it. I was having problems with a 555 as well that I had not noticed or mentioned in my previous post. Started over with the 555 and was finally able to get it working. It is also possible I might have some bad IC's as well. Bought 5 in a tube from Mouser. Will definitely take your and others advice. Filtering seems to be extremely important with the 4013. That puppy is very fast. Thanks for the input.

DAQARTA v8.00
Data AcQuisition And Real-Time Analysis
www.daqarta.com
Scope, Spectrum, Spectrogram, Sound Level Meter
Frequency Counter, Pitch Track, Pitch-to-MIDI
FREE 8-channel Signal Generator, DaqMusiq generator
Science with your sound card!
Click to expand...
 
On Wed, 16 Sep 2015 15:04:09 -0700 (PDT), "Ron M."
<strmbrgr2@hotmail.com> wrote:

Need a flip/flop bistable with following features. Q and not Q must change=
states upon each positive input pulse. I have tried both a 4013 and 4027 b=
ut some crazy reason can't seem to get the desired results. I know it shoul=
d be real simple but solution eludes me. HELP!!
Click to expand...

Hmm, you wouldn't by any chance be breadboarding this on one
of those white plastic proto-boards with a bazillion little
sockets on 0.1 inch spacing, would you?

If so, besides what others have suggested, try adding a 10k
series resistor to the clock line of your 4013. Many years
ago I had exactly your problem, until I eventually stumbled
onto the magical 10k resistor trick.

You don't need it when you actually build the circuit on PC
board, only when all the chip lines are cross-coupled by the
capacitances between the proto-board connectors. Slowing
down the rise time just a smidge with the 10k seems to do
the trick.

Best regards,


Bob Masta

DAQARTA v8.00
Data AcQuisition And Real-Time Analysis
www.daqarta.com
Scope, Spectrum, Spectrogram, Sound Level Meter
Frequency Counter, Pitch Track, Pitch-to-MIDI
FREE 8-channel Signal Generator, DaqMusiq generator
Science with your sound card!
 
On Wed, 16 Sep 2015 18:19:56 -0700, Ron M. wrote:

On Wednesday, September 16, 2015 at 7:08:25 PM UTC-5, whit3rd wrote:
On Wednesday, September 16, 2015 at 3:04:13 PM UTC-7, Ron M. wrote:
Need a flip/flop bistable with following features. Q and not Q must
change states upon each positive input pulse. I have tried both a
4013 and 4027 but...

Firstly, you need a logic-level 'input pulse' source. Then. you need
to power the flip/flop chip, with a bit of power supply bypass
capacitance (.01 uF or more) near the chip.
Then, the unused inputs (Set, Reset, for both sections , and D and CLK
for the unused section) must be connected to keep them quiescent.
Connecting those all LOW will be fine.
Then, connect your input pulse to CLK and connect D to /Q for the
active flip/flop section of the CD4013.

That's not the complete list of things to worry about, but it's a good
start.

All those options have been tried including buffered outputs, different
IC's, etc. Will keep digging. Almost to the point of just trying a
discrete symmetrical bistable with appropriate out put sections.
Click to expand...

What behavior are you actually seeing?

Another suspect is a poorly terminated clock line that's ringing and
clocking the chip multiple times each edge, but without knowing your
setup I can't say.

--

Tim Wescott
Wescott Design Services
http://www.wescottdesign.com
 
On Thu, 17 Sep 2015 11:51:41 -0500, Tim Wescott
<seemywebsite@myfooter.really> wrote:

On Wed, 16 Sep 2015 18:19:56 -0700, Ron M. wrote:

On Wednesday, September 16, 2015 at 7:08:25 PM UTC-5, whit3rd wrote:
On Wednesday, September 16, 2015 at 3:04:13 PM UTC-7, Ron M. wrote:
Need a flip/flop bistable with following features. Q and not Q must
change states upon each positive input pulse. I have tried both a
4013 and 4027 but...

Firstly, you need a logic-level 'input pulse' source. Then. you need
to power the flip/flop chip, with a bit of power supply bypass
capacitance (.01 uF or more) near the chip.
Then, the unused inputs (Set, Reset, for both sections , and D and CLK
for the unused section) must be connected to keep them quiescent.
Connecting those all LOW will be fine.
Then, connect your input pulse to CLK and connect D to /Q for the
active flip/flop section of the CD4013.

That's not the complete list of things to worry about, but it's a good
start.

All those options have been tried including buffered outputs, different
IC's, etc. Will keep digging. Almost to the point of just trying a
discrete symmetrical bistable with appropriate out put sections.

What behavior are you actually seeing?

Another suspect is a poorly terminated clock line that's ringing and
clocking the chip multiple times each edge, but without knowing your
setup I can't say.
Click to expand...

Probably needs to make sure \S\ and \R\ are tied high >:-}

OR... too slow a clock edge.

...Jim Thompson
--
| James E.Thompson | mens |
| Analog Innovations | et |
| Analog/Mixed-Signal ASIC's and Discrete Systems | manus |
| San Tan Valley, AZ 85142 Skype: skypeanalog | |
| Voice:(480)460-2350 Fax: Available upon request | Brass Rat |
| E-mail Icon at http://www.analog-innovations.com | 1962 |

I love to cook with wine. Sometimes I even put it in the food.
 
On Thursday, September 17, 2015 at 7:16:10 AM UTC-5, Bob Masta wrote:
On Wed, 16 Sep 2015 15:04:09 -0700 (PDT), "Ron M."
strmbrgr2@hotmail.com> wrote:

Need a flip/flop bistable with following features. Q and not Q must change> > states upon each positive input pulse. I have tried both a 4013 and 4027 b> >ut some crazy reason can't seem to get the desired results. I know it shoul> >d be real simple but solution eludes me. HELP!!

Hmm, you wouldn't by any chance be breadboarding this on one
of those white plastic proto-boards with a bazillion little
sockets on 0.1 inch spacing, would you?

If so, besides what others have suggested, try adding a 10k
series resistor to the clock line of your 4013. Many years
ago I had exactly your problem, until I eventually stumbled
onto the magical 10k resistor trick.

You don't need it when you actually build the circuit on PC
board, only when all the chip lines are cross-coupled by the
capacitances between the proto-board connectors. Slowing
down the rise time just a smidge with the 10k seems to do
the trick.

Best regards,


Bob Masta

DAQARTA v8.00
Data AcQuisition And Real-Time Analysis
www.daqarta.com
Scope, Spectrum, Spectrogram, Sound Level Meter
Frequency Counter, Pitch Track, Pitch-to-MIDI
FREE 8-channel Signal Generator, DaqMusiq generator
Science with your sound card!
Click to expand...

Problem solved. It indeed appears to have been induced noise. Capped the hell out of everything and it settled right down. Apparently my first attempt at capping it was not sufficiently robust. Thanks for everyone's help. Will post pics of the Beast (redneck version of a Mighty Mule) when we are done.
 
On Thursday, September 17, 2015 at 11:58:34 AM UTC-5, Jim Thompson wrote:
On Thu, 17 Sep 2015 11:51:41 -0500, Tim Wescott
seemywebsite@myfooter.really> wrote:

On Wed, 16 Sep 2015 18:19:56 -0700, Ron M. wrote:

On Wednesday, September 16, 2015 at 7:08:25 PM UTC-5, whit3rd wrote:
On Wednesday, September 16, 2015 at 3:04:13 PM UTC-7, Ron M. wrote:
Need a flip/flop bistable with following features. Q and not Q must
change states upon each positive input pulse. I have tried both a
4013 and 4027 but...

Firstly, you need a logic-level 'input pulse' source. Then. you need
to power the flip/flop chip, with a bit of power supply bypass
capacitance (.01 uF or more) near the chip.
Then, the unused inputs (Set, Reset, for both sections , and D and CLK
for the unused section) must be connected to keep them quiescent.
Connecting those all LOW will be fine.
Then, connect your input pulse to CLK and connect D to /Q for the
active flip/flop section of the CD4013.

That's not the complete list of things to worry about, but it's a good
start.

All those options have been tried including buffered outputs, different
IC's, etc. Will keep digging. Almost to the point of just trying a
discrete symmetrical bistable with appropriate out put sections.

What behavior are you actually seeing?

Another suspect is a poorly terminated clock line that's ringing and
clocking the chip multiple times each edge, but without knowing your
setup I can't say.

Probably needs to make sure \S\ and \R\ are tied high >:-}
Click to expand...

Hehe!!

OR... too slow a clock edge.
Click to expand...

100 ns rise.


...Jim Thompson
--
| James E.Thompson | mens |
| Analog Innovations | et |
| Analog/Mixed-Signal ASIC's and Discrete Systems | manus |
| San Tan Valley, AZ 85142 Skype: skypeanalog | |
| Voice:(480)460-2350 Fax: Available upon request | Brass Rat |
| E-mail Icon at http://www.analog-innovations.com | 1962 |

I love to cook with wine. Sometimes I even put it in the food.
Click to expand...
 
On Fri, 18 Sep 2015 13:58:48 -0700, Ron M. wrote:

On Thursday, September 17, 2015 at 11:58:34 AM UTC-5, Jim Thompson
wrote:
On Thu, 17 Sep 2015 11:51:41 -0500, Tim Wescott
seemywebsite@myfooter.really> wrote:

On Wed, 16 Sep 2015 18:19:56 -0700, Ron M. wrote:

On Wednesday, September 16, 2015 at 7:08:25 PM UTC-5, whit3rd wrote:
On Wednesday, September 16, 2015 at 3:04:13 PM UTC-7, Ron M. wrote:
Need a flip/flop bistable with following features. Q and not Q
must change states upon each positive input pulse. I have tried
both a 4013 and 4027 but...

Firstly, you need a logic-level 'input pulse' source. Then. you
need to power the flip/flop chip, with a bit of power supply bypass
capacitance (.01 uF or more) near the chip.
Then, the unused inputs (Set, Reset, for both sections , and D and
CLK for the unused section) must be connected to keep them
quiescent. Connecting those all LOW will be fine.
Then, connect your input pulse to CLK and connect D to /Q for the
active flip/flop section of the CD4013.

That's not the complete list of things to worry about, but it's a
good start.

All those options have been tried including buffered outputs,
different IC's, etc. Will keep digging. Almost to the point of just
trying a discrete symmetrical bistable with appropriate out put
sections.

What behavior are you actually seeing?

Another suspect is a poorly terminated clock line that's ringing and
clocking the chip multiple times each edge, but without knowing your
setup I can't say.

Probably needs to make sure \S\ and \R\ are tied high >:-}

Hehe!!


OR... too slow a clock edge.

100 ns rise.
Click to expand...

That should be a good speed for 4000 series logic. Maybe on the edge of
acceptability for 74HC4000, and very possibly too slow for 74AHC.

Can you choose the free hosting service that you distrust the least and
post both a schematic and a photo of your actual physical circuit?
Chances are that there's something going on here that's beyond what they
mention in the data sheets.

--
www.wescottdesign.com
 
On Saturday, September 19, 2015 at 12:17:15 AM UTC-5, Tim Wescott wrote:
On Fri, 18 Sep 2015 13:58:48 -0700, Ron M. wrote:

On Thursday, September 17, 2015 at 11:58:34 AM UTC-5, Jim Thompson
wrote:
On Thu, 17 Sep 2015 11:51:41 -0500, Tim Wescott
seemywebsite@myfooter.really> wrote:

On Wed, 16 Sep 2015 18:19:56 -0700, Ron M. wrote:

On Wednesday, September 16, 2015 at 7:08:25 PM UTC-5, whit3rd wrote:
On Wednesday, September 16, 2015 at 3:04:13 PM UTC-7, Ron M. wrote:
Need a flip/flop bistable with following features. Q and not Q
must change states upon each positive input pulse. I have tried
both a 4013 and 4027 but...

Firstly, you need a logic-level 'input pulse' source. Then. you
need to power the flip/flop chip, with a bit of power supply bypass
capacitance (.01 uF or more) near the chip.
Then, the unused inputs (Set, Reset, for both sections , and D and
CLK for the unused section) must be connected to keep them
quiescent. Connecting those all LOW will be fine.
Then, connect your input pulse to CLK and connect D to /Q for the
active flip/flop section of the CD4013.

That's not the complete list of things to worry about, but it's a
good start.

All those options have been tried including buffered outputs,
different IC's, etc. Will keep digging. Almost to the point of just
trying a discrete symmetrical bistable with appropriate out put
sections.

What behavior are you actually seeing?

Another suspect is a poorly terminated clock line that's ringing and
clocking the chip multiple times each edge, but without knowing your
setup I can't say.

Probably needs to make sure \S\ and \R\ are tied high >:-}

Hehe!!


OR... too slow a clock edge.

100 ns rise.


That should be a good speed for 4000 series logic. Maybe on the edge of
acceptability for 74HC4000, and very possibly too slow for 74AHC.

Can you choose the free hosting service that you distrust the least and
post both a schematic and a photo of your actual physical circuit?
Chances are that there's something going on here that's beyond what they
mention in the data sheets.

--
www.wescottdesign.com
Click to expand...

Everything stabled up after addition of caps in the right places. Circuit is not finalized as of yet. It is a controller for a homemade gate opener akin to a Mighty Mule only over-killed to all dickins. Basically it is a wireless momentary receiver feeding 555 for pulse shaping then flip flop for bistable outputs each of which feeds 555 providing timed output to run a motor (1 555 for each direction) plus appropriate power/polarity handling. The motor is limited via both diode steering as well as timer disables derived from said closures. We are using a 2200 lb. capacity linear actuator (OVERKILL but it was free)so if it ever gets to an end stop it will tear stuff asunder. It is made for 24VDC. We are using it on 12VDC which takes some of the power away but not by much. It will push me right off the floor. So therefore the double limits. Will post a schematic and pics once it is further along. Hope to have circuit nailed down by end of weekend. By the way. Does anyone know how to render a jpg or gif from TinyCad?
 
On Fri, 18 Sep 2015 22:55:57 -0700 (PDT), "Ron M."
<strmbrgr2@hotmail.com> wrote:

On Saturday, September 19, 2015 at 12:17:15 AM UTC-5, Tim Wescott wrote:
On Fri, 18 Sep 2015 13:58:48 -0700, Ron M. wrote:
=20
On Thursday, September 17, 2015 at 11:58:34 AM UTC-5, Jim Thompson
wrote:
On Thu, 17 Sep 2015 11:51:41 -0500, Tim Wescott
seemywebsite@myfooter.really> wrote:
=20
On Wed, 16 Sep 2015 18:19:56 -0700, Ron M. wrote:

On Wednesday, September 16, 2015 at 7:08:25 PM UTC-5, whit3rd wrote=
:
On Wednesday, September 16, 2015 at 3:04:13 PM UTC-7, Ron M. wrote=
:
Need a flip/flop bistable with following features. Q and not Q
must change states upon each positive input pulse. I have tried
both a 4013 and 4027 but...
=20
Firstly, you need a logic-level 'input pulse' source. Then. you
need to power the flip/flop chip, with a bit of power supply bypas=
s
capacitance (.01 uF or more) near the chip.
Then, the unused inputs (Set, Reset, for both sections , and D and
CLK for the unused section) must be connected to keep them
quiescent. Connecting those all LOW will be fine.
Then, connect your input pulse to CLK and connect D to /Q for the
active flip/flop section of the CD4013.
=20
That's not the complete list of things to worry about, but it's a
good start.
=20
All those options have been tried including buffered outputs,
different IC's, etc. Will keep digging. Almost to the point of just
trying a discrete symmetrical bistable with appropriate out put
sections.

What behavior are you actually seeing?

Another suspect is a poorly terminated clock line that's ringing and
clocking the chip multiple times each edge, but without knowing your
setup I can't say.
=20
Probably needs to make sure \S\ and \R\ are tied high >:-}
=20
Hehe!!
=20
=20
OR... too slow a clock edge.
=20
100 ns rise.
=20
=20
That should be a good speed for 4000 series logic. Maybe on the edge of=
=20
acceptability for 74HC4000, and very possibly too slow for 74AHC.
=20
Can you choose the free hosting service that you distrust the least and=
=20
post both a schematic and a photo of your actual physical circuit? =20
Chances are that there's something going on here that's beyond what they=
=20
mention in the data sheets.
=20
--=20
www.wescottdesign.com

Everything stabled up after addition of caps in the right places. Circuit i=
s not finalized as of yet. It is a controller for a homemade gate opener ak=
in to a Mighty Mule only over-killed to all dickins. Basically it is a wire=
less momentary receiver feeding 555 for pulse shaping then flip flop for bi=
stable outputs each of which feeds 555 providing timed output to run a moto=
r (1 555 for each direction) plus appropriate power/polarity handling. The =
motor is limited via both diode steering as well as timer disables derived =
from said closures. We are using a 2200 lb. capacity linear actuator (OVERK=
ILL but it was free)so if it ever gets to an end stop it will tear stuff as=
under. It is made for 24VDC. We are using it on 12VDC which takes some of t=
he power away but not by much. It will push me right off the floor. So ther=
efore the double limits. Will post a schematic and pics once it is further =
along. Hope to have circuit nailed down by end of weekend. By the way. Does=
anyone know how to render a jpg or gif from TinyCad?
Click to expand...

I don't know anything about TinyCad, but ALT+PrintScreen
will copy the image to the Windows Clipboard as a bitmap,
from which you can paste it into Windows Paint and save as
JPG or GIF (or PNG, etc).

Best regards,


Bob Masta

DAQARTA v8.00
Data AcQuisition And Real-Time Analysis
www.daqarta.com
Scope, Spectrum, Spectrogram, Sound Level Meter
Frequency Counter, Pitch Track, Pitch-to-MIDI
FREE 8-channel Signal Generator, DaqMusiq generator
Science with your sound card!
 
On Saturday, September 19, 2015 at 12:56:03 AM UTC-5, Ron M. wrote:
On Saturday, September 19, 2015 at 12:17:15 AM UTC-5, Tim Wescott wrote:
On Fri, 18 Sep 2015 13:58:48 -0700, Ron M. wrote:

On Thursday, September 17, 2015 at 11:58:34 AM UTC-5, Jim Thompson
wrote:
On Thu, 17 Sep 2015 11:51:41 -0500, Tim Wescott
seemywebsite@myfooter.really> wrote:

On Wed, 16 Sep 2015 18:19:56 -0700, Ron M. wrote:

On Wednesday, September 16, 2015 at 7:08:25 PM UTC-5, whit3rd wrote:
On Wednesday, September 16, 2015 at 3:04:13 PM UTC-7, Ron M. wrote:
Need a flip/flop bistable with following features. Q and not Q
must change states upon each positive input pulse. I have tried
both a 4013 and 4027 but...

Firstly, you need a logic-level 'input pulse' source. Then. you
need to power the flip/flop chip, with a bit of power supply bypass
capacitance (.01 uF or more) near the chip.
Then, the unused inputs (Set, Reset, for both sections , and D and
CLK for the unused section) must be connected to keep them
quiescent. Connecting those all LOW will be fine.
Then, connect your input pulse to CLK and connect D to /Q for the
active flip/flop section of the CD4013.

That's not the complete list of things to worry about, but it's a
good start.

All those options have been tried including buffered outputs,
different IC's, etc. Will keep digging. Almost to the point of just
trying a discrete symmetrical bistable with appropriate out put
sections.

What behavior are you actually seeing?

Another suspect is a poorly terminated clock line that's ringing and
clocking the chip multiple times each edge, but without knowing your
setup I can't say.

Probably needs to make sure \S\ and \R\ are tied high >:-}

Hehe!!


OR... too slow a clock edge.

100 ns rise.


That should be a good speed for 4000 series logic. Maybe on the edge of
acceptability for 74HC4000, and very possibly too slow for 74AHC.

Can you choose the free hosting service that you distrust the least and
post both a schematic and a photo of your actual physical circuit?
Chances are that there's something going on here that's beyond what they
mention in the data sheets.

--
www.wescottdesign.com

Everything stabled up after addition of caps in the right places. Circuit is not finalized as of yet. It is a controller for a homemade gate opener akin to a Mighty Mule only over-killed to all dickins. Basically it is a wireless momentary receiver feeding 555 for pulse shaping then flip flop for bistable outputs each of which feeds 555 providing timed output to run a motor (1 555 for each direction) plus appropriate power/polarity handling. The motor is limited via both diode steering as well as timer disables derived from said closures. We are using a 2200 lb. capacity linear actuator (OVERKILL but it was free)so if it ever gets to an end stop it will tear stuff asunder. It is made for 24VDC. We are using it on 12VDC which takes some of the power away but not by much. It will push me right off the floor. So therefore the double limits. Will post a schematic and pics once it is further along. Hope to have circuit nailed down by end of weekend. By the way. Does anyone know how to render a jpg or gif from TinyCad?
Click to expand...

Slight delay on posting a schematic. Well as usual got in hurry and over ambitious. Stuffed board too full and 556 caught a short and nuked itself. So sad watching that little puff of smoke shooting like a miniature pyro device out of the side of the 556. At least I got a small pyro hit from it. Grin!! Onward.
 
On Thu, 17 Sep 2015 09:58:31 -0700, Jim Thompson
<To-Email-Use-The-Envelope-Icon@On-My-Web-Site.com> wrote:


>Probably needs to make sure \S\ and \R\ are tied high >:-}

---
Low for a 4013. :)

John Fields
 
On Wednesday, September 23, 2015 at 10:52:18 AM UTC-5, John Fields wrote:
On Thu, 17 Sep 2015 09:58:31 -0700, Jim Thompson
To-Email-Use-The-Envelope-Icon@On-My-Web-Site.com> wrote:


Probably needs to make sure \S\ and \R\ are tied high >:-}

---
Low for a 4013. :)

John Fields
Click to expand...

The little smiley face kind of gave the joke away. I thought it was funny.
 
"Ron M." <strmbrgr2@hotmail.com> wrote in message
news:383d51ca-0e4a-421f-a115-1ebcc6f96d05@googlegroups.com...
Need a flip/flop bistable with following features. Q and not Q must
change states upon each positive input pulse. I have tried both a 4013 and
4027 but some crazy reason can't seem to get the desired results. I know
it should be real simple but solution eludes me. HELP!!
Click to expand...

A 4013 will act as a bistable if you run the NOT-Q back to the D input,
whatever logic state is on NOT-Q/D input gets clocked through to Q on the CP
positive edge.

Whatever flip-flop you use, problems can arise from a glitchy CP, sometimes
it can help to feed CP via a C/R differentiator.
 
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