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kumarr68
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Join Date: Aug 2009
Posts: 33

Single shot pulse circuit

10/10/2009 10:47 AM

Dear friends ,i am looking for circuit which can generate a single pulse(TTL) duration 100 to 500mS as soon as the circuit power is turn ON.Meaning when i turn ON the power there is a single pulse and off. ( High to Low )Here the triggering signal is the power supply.(24Vdc)I am planning to use this pulse to trigger a SCR.

Thank you.
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dkwarner
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Join Date: May 2006
Location: Placerville, CA (38° 45N, 120° 47'W)
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#1

Re: Single shot pulse circuit

10/10/2009 11:38 PM

Any text describing NE555 timers will have several ways to achieve this goal. Total parts cost around a dollar or two.

I'm not at home this week, so I can't quickly give you the exact title and author, nor a specific circuit.

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mjb1962853
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Engineering Fields - Electrical Engineering - Analog and Digital Circuit Design Engineering Fields - Electromechanical Engineering - Transformers, Motors & Drives, EM Launchers Engineering Fields - Engineering Physics - Applied Electrical, Optical, and Mechanical

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#2

Re: Single shot pulse circuit

10/11/2009 7:01 PM

This simple SCR gate drive circuit could be sufficient. Values are just initial suggestions.
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dkwarner
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#4
In reply to #2

Re: Single shot pulse circuit

10/12/2009 12:18 PM

That's simple enough, but you need a SPDT switch to discharge the capacitor when power is removed, and possibly a diode in parallel with the resistor to discharge quickly, if the off time can be very short.

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mjb1962853
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Engineering Fields - Electrical Engineering - Analog and Digital Circuit Design Engineering Fields - Electromechanical Engineering - Transformers, Motors & Drives, EM Launchers Engineering Fields - Engineering Physics - Applied Electrical, Optical, and Mechanical

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#6
In reply to #4

Re: Single shot pulse circuit

10/12/2009 12:38 PM

Yup! If wired as shown, cap needs discharge path. Assumed load on 24Vdc would be enough, otherwise additional R is needed. More likely PS is switched from line side. Cap discharge could then occur through PS, load, or additional R.
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maveric_manic
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Join Date: Apr 2009
Location: Los Angeles, California USA
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#3

Re: Single shot pulse circuit

10/11/2009 7:28 PM

I just used a design in this link just what you are talking about. Run it at 5V and adjust the timing capacitor works good I tested it. Here is the link: http://www.kpsec.freeuk.com/555timer.htm

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dkwarner
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Location: Placerville, CA (38° 45N, 120° 47'W)
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#5
In reply to #3

Re: Single shot pulse circuit

10/12/2009 12:21 PM

Good Link!

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kumarr68
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Join Date: Aug 2009
Posts: 33
#7

Re: Single shot pulse circuit

10/14/2009 11:15 AM

Guys , thanks alot for the information. Really appreciated your ideas.
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dkwarner (3); kumarr68 (1); maveric_manic (1); mjb1962853 (2)

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