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generating pulse
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prateek
electronics forum beginner


Joined: 20 Jun 2006
Posts: 11

PostPosted: Fri Jun 23, 2006 1:56 pm    Post subject: generating pulse Reply with quote

I need about 5% duty cycle pulse of about 1 sec time period. A second
pulse required should be of same characteristics but delayed by a
duration by about the 'on' time of the second pulse. ie the first
pulse should go on and then the secoond pulse should go on. Need a
simple solution please
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Mochuelo
electronics forum Guru Wannabe


Joined: 10 May 2005
Posts: 128

PostPosted: Fri Jun 23, 2006 3:38 pm    Post subject: Re: generating pulse Reply with quote

On 23 Jun 2006 06:56:34 -0700, "prateek"
<prateekprashar2003@yahoo.co.in> wrote:

Quote:
I need about 5% duty cycle pulse of about 1 sec time period. A second
pulse required should be of same characteristics but delayed by a
duration by about the 'on' time of the second pulse. ie the first
pulse should go on and then the secoond pulse should go on. Need a
simple solution please

Cheapest is a microcontroller running on its internal RC oscillator,
which you may have more or less calibrated.

If you don't want to use microcontrollers, you can use a 1 Hz
oscillator that feeds a monostable that generates 50 ms wide, high
logic-level pulses. A second monostable is set to trigger on the
high-to-low transitions of the first monostable's output, and also
generates 50 ms wide, high logic-level pulses. You can do the whole
thing with a 40106 (hex inverter with schmitt-trigger), three
capacitors, three resistors and two diodes, as shown in the figure.

http://80.35.195.131/ng/ng_20060623A01.png

R1 & C1 such that period is 1 s.
R2 & C2 such that A and B pulses are 50 ms wide.
D1 can be 1N4148.

Best,
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Tim Williams
electronics forum Guru


Joined: 18 May 2005
Posts: 668

PostPosted: Fri Jun 23, 2006 11:50 pm    Post subject: Re: generating pulse Reply with quote

So, you want:
___
Trig ___| . . . (doesn't matter?)
__________
A ___| |________________ . . . (until next trigger)
__________
B ______________| |_____ . . .

???

You can do that with two of these.
http://webpages.charter.net/dawill/Images/One-shot%20Timer.gif
Trig is the input. Connect Q' (Q bar) to Trig of the second one. Use Q
from each for the "A" and "B" output above. Adjust Rt and Ct for one
second.

Tim

--
Deep Fryer: a very philosophical monk.
Website: http://webpages.charter.net/dawill/tmoranwms

"prateek" <prateekprashar2003@yahoo.co.in> wrote in message
news:1151070993.945348.109210@r2g2000cwb.googlegroups.com...
Quote:
I need about 5% duty cycle pulse of about 1 sec time period. A second
pulse required should be of same characteristics but delayed by a
duration by about the 'on' time of the second pulse. ie the first
pulse should go on and then the secoond pulse should go on. Need a
simple solution please
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ehsjr
electronics forum Guru


Joined: 03 May 2005
Posts: 863

PostPosted: Sat Jun 24, 2006 1:35 am    Post subject: Re: generating pulse Reply with quote

prateek wrote:
Quote:
I need about 5% duty cycle pulse of about 1 sec time period. A second
pulse required should be of same characteristics but delayed by a
duration by about the 'on' time of the second pulse. ie the first
pulse should go on and then the secoond pulse should go on. Need a
simple solution please


_ _ _ _
| | | | | | | |
-- -- --------------------- -- ---
T 0 1 2 3 Repeat

So you want T0-T1 = 50 mS, T1-T2 = 50mS,
T0-Repeat = 1000 mS?

Count to 20 in 50 mS steps (drive 4017's with
a 555 running at 20 hZ, set the 4017 chain
to reset at count 20). Use counter output 0 and
2 for your pulses. Actually you can use any
pair of counts such that there is one count
between them, like 1 and 3, 2 and 4, 3 and 5, etc.

Ed
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