Question: need two 1-second-pulses 30 seconds after power-on

C

Christoph Ramm

Guest
Hello newsgroup!

Maybe the question is a little confusing, that's why I drew a little
picture...



| ------ ------
| | | | |
|-//---------------------- -------- ------//--> output
|
| <------- 30s-----><-1s-><-1s-><-1s->
| <------- T1 -----><-T2-><-T3-><-T4->
|
| -----------------------------------------//--> power supply
| |
|-//----
|
--//--------------------------------------------//--> t

T1: about 30 s
T2=T3=T4: about 1 s

I need a simple circuit, that creates two one-second-signals 30 seconds
after turning the power on. I tried using the 555 timer IC, but I wasn't
successfull. Can you help me? Thanks a lot!

Greets, Christoph



PS: sorry for that bad english :)
 
On Tue, 06 Jan 2004 23:34:15 +0100, Christoph Ramm
<christoph.ramm@gmx.net> wrote:

Hello newsgroup!

Maybe the question is a little confusing, that's why I drew a little
picture...



| ------ ------
| | | | |
|-//---------------------- -------- ------//--> output
|
| <------- 30s-----><-1s-><-1s-><-1s-
| <------- T1 -----><-T2-><-T3-><-T4-
|
| -----------------------------------------//--> power supply
| |
|-//----
|
--//--------------------------------------------//--> t

T1: about 30 s
T2=T3=T4: about 1 s

I need a simple circuit, that creates two one-second-signals 30 seconds
after turning the power on. I tried using the 555 timer IC, but I wasn't
successfull. Can you help me?
Click to expand...
---
What kind of accuracy do you want?

--
John Fields
 
John Fields schrieb:
On Tue, 06 Jan 2004 23:34:15 +0100, Christoph Ramm
christoph.ramm@gmx.net> wrote:



---
What kind of accuracy do you want?
Click to expand...
not very good, 30 s may be 25..35 s, 1 s may be 0,75..1,25 s

--
John Fields
Click to expand...
 
On Wed, 07 Jan 2004 10:13:27 +0100, Christoph Ramm
<christoph.ramm@gmx.net> wrote:

John Fields schrieb:

On Tue, 06 Jan 2004 23:34:15 +0100, Christoph Ramm
christoph.ramm@gmx.net> wrote:



---
What kind of accuracy do you want?

not very good, 30 s may be 25..35 s, 1 s may be 0,75..1,25 s
Click to expand...
---
check "Need two 1-second-pulses 30 seconds after power-on" on
alt.binaries.schematics.electronic.

--
John Fields
 
Hello John!

Thank you for your answer. But I have a problem: I can't read the group
"alt.binaries.schematics.electronic". Maybe you can send the content of
your answer to my private mail?

Thank you, Christoph



John Fields schrieb:
On Wed, 07 Jan 2004 10:13:27 +0100, Christoph Ramm
christoph.ramm@gmx.net> wrote:

John Fields schrieb:

On Tue, 06 Jan 2004 23:34:15 +0100, Christoph Ramm
christoph.ramm@gmx.net> wrote:



---
What kind of accuracy do you want?

not very good, 30 s may be 25..35 s, 1 s may be 0,75..1,25 s

---
check "Need two 1-second-pulses 30 seconds after power-on" on
alt.binaries.schematics.electronic.

--
John Fields
Click to expand...
 
On Thu, 08 Jan 2004 21:38:12 +0100, Christoph Ramm
<christoph.ramm@gmx.net> wrote:

Hello John!

Thank you for your answer. But I have a problem: I can't read the group
"alt.binaries.schematics.electronic". Maybe you can send the content of
your answer to my private mail?
Click to expand...
---
Done!-)

--
John Fields
 
You could use a small 8 pin PIC, the software would not be very
complex. Plus, you could change the pulse durations, nos etc. anytime
in the future if the requirements change.

Regards,

Anand Dhuru


Christoph Ramm <christoph.ramm@gmx.net> wrote in message news:<3FFB37E7.31CB4B5E@gmx.net>...
Hello newsgroup!

Maybe the question is a little confusing, that's why I drew a little
picture...



| ------ ------
| | | | |
|-//---------------------- -------- ------//--> output
|
| <------- 30s-----><-1s-><-1s-><-1s-
| <------- T1 -----><-T2-><-T3-><-T4-
|
| -----------------------------------------//--> power supply
| |
|-//----
|
--//--------------------------------------------//--> t

T1: about 30 s
T2=T3=T4: about 1 s

I need a simple circuit, that creates two one-second-signals 30 seconds
after turning the power on. I tried using the 555 timer IC, but I wasn't
successfull. Can you help me? Thanks a lot!

Greets, Christoph



PS: sorry for that bad english :)
Click to expand...
 
Method 1: 4 x 555 (attached)
----------------------------
http://www.terrypin.dial.pipex.com/Images/PulseTimer4x555.gif

I was pleased to get this working, despite its unimaginative approach.

Method 2: 4017 (attached)
-------------------------
http://www.terrypin.dial.pipex.com/Images/PulseTimer4017.gif

This is my preferred approach, as it requires only two simple,
independent adjustments: the 29.5s mono period and the 1s astable.
That odd duration of 29.5s was chosen because the clock won't
necessarily be closely synchronised with the mono outputs. That could
give rise to an extra delay of up to 1s. Circuit should ensure delay
between power up and first 1s pulse is between 29.5 and 30.5s,
'averaging' 30.0s.

If a slightly inferior output was acceptable, the OR gate could be
made from a couple of diodes and a resistor, and the half 4001 used to
make the monostable, eliminating the 555.

--
Terry Pinnell
Hobbyist, West Sussex, UK
 
"Terry Pinnell" <terrypinDELETE@dial.pipexTHIS.com> a écrit dans le message
news: p7atvvspjk9juifjmtratv91vbtcco1s1b@4ax.com...
Method 1: 4 x 555 (attached)
----------------------------
http://www.terrypin.dial.pipex.com/Images/PulseTimer4x555.gif

I was pleased to get this working, despite its unimaginative approach.

Method 2: 4017 (attached)
-------------------------
http://www.terrypin.dial.pipex.com/Images/PulseTimer4017.gif

This is my preferred approach, as it requires only two simple,
independent adjustments: the 29.5s mono period and the 1s astable.
That odd duration of 29.5s was chosen because the clock won't
necessarily be closely synchronised with the mono outputs. That could
give rise to an extra delay of up to 1s. Circuit should ensure delay
between power up and first 1s pulse is between 29.5 and 30.5s,
'averaging' 30.0s.

If a slightly inferior output was acceptable, the OR gate could be
made from a couple of diodes and a resistor, and the half 4001 used to
make the monostable, eliminating the 555.

--
Terry Pinnell
Hobbyist, West Sussex, UK


Hi Terry,
Click to expand...
I'm sure that you can achieve much lower part count (and BTW avoid the 2
adjustments problem).

Hint : use only 1x555, 1x74(HC)93.

Fred.
 
Hello Anand,

I've thought about this solution, it would be the most simple. But I had
to learn how to program PIS in assembler, I don't know how long this
would takt. I program C167-uC's in C, I don't know the traps of PICs...

But thank you anyway!

Christoph

Anand Dhuru schrieb:
You could use a small 8 pin PIC, the software would not be very
complex. Plus, you could change the pulse durations, nos etc. anytime
in the future if the requirements change.

Regards,

Anand Dhuru

Christoph Ramm <christoph.ramm@gmx.net> wrote in message news:<3FFB37E7.31CB4B5E@gmx.net>...
Hello newsgroup!

Maybe the question is a little confusing, that's why I drew a little
picture...



| ------ ------
| | | | |
|-//---------------------- -------- ------//--> output
|
| <------- 30s-----><-1s-><-1s-><-1s-
| <------- T1 -----><-T2-><-T3-><-T4-
|
| -----------------------------------------//--> power supply
| |
|-//----
|
--//--------------------------------------------//--> t

T1: about 30 s
T2=T3=T4: about 1 s

I need a simple circuit, that creates two one-second-signals 30 seconds
after turning the power on. I tried using the 555 timer IC, but I wasn't
successfull. Can you help me? Thanks a lot!

Greets, Christoph



PS: sorry for that bad english :)
Click to expand...
 
On Fri, 09 Jan 2004 15:29:13 +0100, Christoph Ramm
<christoph.ramm@gmx.net> wrote:

Hello John,

thanks a lot, I'll try this!
---
Click to expand...
You're welcome.

As Terry has suggested, the adjustments might be a little tricky, but an
easy way to stay out of trouble would be to start with R3 at maximum
resistance, then adjust R4 (the pot) for the 30s delay from power-on to
the beginning of the first pulse. After that, adjust R3 until the
number of output pulses decreases to 2.

--
John Fields
 
"Fred Bartoli"
<fred._canxxxel_this_bartoli@RemoveThatAlso_free.fr_AndThisToo> wrote in
message news:3ffeaf99$0$1182$636a55ce@news.free.fr...
"Terry Pinnell" <terrypinDELETE@dial.pipexTHIS.com> a écrit dans le
message
news: p7atvvspjk9juifjmtratv91vbtcco1s1b@4ax.com...

Method 1: 4 x 555 (attached)
----------------------------
http://www.terrypin.dial.pipex.com/Images/PulseTimer4x555.gif

I was pleased to get this working, despite its unimaginative approach.

Method 2: 4017 (attached)
-------------------------
http://www.terrypin.dial.pipex.com/Images/PulseTimer4017.gif

This is my preferred approach, as it requires only two simple,
independent adjustments: the 29.5s mono period and the 1s astable.
That odd duration of 29.5s was chosen because the clock won't
necessarily be closely synchronised with the mono outputs. That could
give rise to an extra delay of up to 1s. Circuit should ensure delay
between power up and first 1s pulse is between 29.5 and 30.5s,
'averaging' 30.0s.

If a slightly inferior output was acceptable, the OR gate could be
made from a couple of diodes and a resistor, and the half 4001 used to
make the monostable, eliminating the 555.

--
Terry Pinnell
Hobbyist, West Sussex, UK


Hi Terry,
I'm sure that you can achieve much lower part count (and BTW avoid the 2
adjustments problem).

Hint : use only 1x555, 1x74(HC)93.

Fred.
Click to expand...
Nice drawings. What application do you use?
 
"fpd" <post@here.net> wrote:

"Terry Pinnell" <terrypinDELETE@dial.pipexTHIS.com> a écrit dans le
message
news: p7atvvspjk9juifjmtratv91vbtcco1s1b@4ax.com...
Method 1: 4 x 555 (attached)
----------------------------
http://www.terrypin.dial.pipex.com/Images/PulseTimer4x555.gif

I was pleased to get this working, despite its unimaginative approach.

Method 2: 4017 (attached)
-------------------------
http://www.terrypin.dial.pipex.com/Images/PulseTimer4017.gif

Nice drawings. What application do you use?

Thank you. CircuitMaker.
Click to expand...

--
Terry Pinnell
Hobbyist, West Sussex, UK
 
"Fred Bartoli"
<fred._canxxxel_this_bartoli@RemoveThatAlso_free.fr_AndThisToo> wrote:

"Terry Pinnell" <terrypinDELETE@dial.pipexTHIS.com> a écrit dans le message
news: 4h9tvv4k9p507lksk89i3uct06nbt8bnq8@4ax.com...
John Fields <jfields@austininstruments.com> wrote:

Method 2: 4017 (attached)
-------------------------
http://www.terrypin.dial.pipex.com/Images/PulseTimer4017.gif

This is my preferred approach, as it requires only two simple,
independent adjustments: the 29.5s mono period and the 1s astable.
That odd duration of 29.5s was chosen because the clock won't
necessarily be closely synchronised with the mono outputs. That could
give rise to an extra delay of up to 1s. Circuit should ensure delay
between power up and first 1s pulse is between 29.5 and 30.5s,
'averaging' 30.0s.

It occurs to me that if a slightly inferior output was acceptable, the
OR gate could be made from a couple of diodes and a resistor, and the
half 4001 used to make the monostable, eliminating the 555.

Also posted in original s.e.d thread, without files attached.


Hi Terry,
I'm sure that you can achieve much lower part count.

Hint : use only 1x555, 1x74(HC)93.

Fred.
Click to expand...
Never heard any more from you on that Fred...

I eventually succeeded, but as I said it took a much *higher* part
count! Here's a breakdown:

1 x 74LS93 16-state binary counter (didn't have HC type)

2 x 4001 NOR gates for clock with 2s period and 50% duty cycle

15 x 4001/4011 gates to detect 3 states 13, 14 and 15 and deliver them
with appropriate polarities for subsequent logic

2 x NOR gates to OR states 13, 14 for required 1s output pulses

2 x NOR gates for bistable used to gate the clock (enabled at PU,
disabled on final state, 15)

I had a couple of spare gates left, but in total used 7 ICs.

So my 4017 approach at
http://www.terrypin.dial.pipex.com/Images/PulseTimer4017.gif
which uses only 3 ICs remains my recommended solution.

--
Terry Pinnell
Hobbyist, West Sussex, UK
 
Thank you everybody!

I decidet to use a cheap PIC, programmable with BASIC. It's the simplest
application (only few extra parts), simple to program, flexible if I
need other pulses. Of course, a little overdone... Maybe I'll need
thousands of circuits some day (and I get rich and famous...), then I'll
take a look at a simpler, cheaper circuit. In this case, send me your
bench account, so I'll let you share with my euros :))

Greetings, Christoph
 
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