Comments on: 555 Timer Basics – Monostable Mode http://www.circuitbasics.com/555-timer-basics-monostable-mode/ Raspberry Pi, Arduino, and DIY Electronics Projects and Tutorials Mon, 22 Jan 2018 02:48:22 +0000 hourly 1 By: guiller http://www.circuitbasics.com/555-timer-basics-monostable-mode/#comment-10507 Thu, 19 Oct 2017 11:12:45 +0000 http://www.circuitbasics.com/?p=206#comment-10507 IF I USE 12 v battery?? does this circuit still applicable? if not what component do i need to change??

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By: ar http://www.circuitbasics.com/555-timer-basics-monostable-mode/#comment-7542 Sat, 09 Sep 2017 19:29:18 +0000 http://www.circuitbasics.com/?p=206#comment-7542 I constructed this circuit and it works fine, however when turn the potentiometer all the way down I noticed the 555 timer gets very hot. I’m certain this is because too much current is getting through. Is there anyway to avoid this problem so I don’t ruin my 555 timer?

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By: Circuit Basics http://www.circuitbasics.com/555-timer-basics-monostable-mode/#comment-2133 Sun, 19 Feb 2017 04:33:08 +0000 http://www.circuitbasics.com/?p=206#comment-2133 I’m sure that’s possible, the output of the monostable circuit can be used to trigger a relay. You would just need to know the voltage required to activate your relay, and which pin on the relay is used to activate it. That information should be in the datasheet.

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By: Circuit Basics http://www.circuitbasics.com/555-timer-basics-monostable-mode/#comment-2131 Sun, 19 Feb 2017 04:22:14 +0000 http://www.circuitbasics.com/?p=206#comment-2131 The purpose of the button is just to drop the voltage at the trigger pin. I think if you replaced the button with a transistor, you could control the circuit with the output of a logic gate. I’m not sure about the second part of your question though.

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By: Yum Mahieu http://www.circuitbasics.com/555-timer-basics-monostable-mode/#comment-2116 Sun, 12 Feb 2017 21:39:28 +0000 http://www.circuitbasics.com/?p=206#comment-2116 https://play.google.com/store/apps/details?id=au.com.hpo.timertool

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By: amjad http://www.circuitbasics.com/555-timer-basics-monostable-mode/#comment-1940 Tue, 06 Dec 2016 05:21:18 +0000 http://www.circuitbasics.com/?p=206#comment-1940 would you eliberate it in better way

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By: Edwin Lopez http://www.circuitbasics.com/555-timer-basics-monostable-mode/#comment-1786 Thu, 20 Oct 2016 14:22:20 +0000 http://www.circuitbasics.com/?p=206#comment-1786 I have tried assembling the monostable mode circuit above and it worked.
Now I wanted to use this for glow plug heating of my diesel car. My problem is how to utilize this monostable circuit to drive or activate a Bosch mini relay. I would appreciate if you could provide me a circuit diagram as I need it very badly. Thank you very much for your help.

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By: Nahc Eya http://www.circuitbasics.com/555-timer-basics-monostable-mode/#comment-1598 Wed, 31 Aug 2016 11:09:28 +0000 http://www.circuitbasics.com/?p=206#comment-1598 t = 1.1RC
t = time in second
Use Variable resistor 500k resistor like “504” and use 3000uF capacitor.

if R is 100k and C is 3000u,
then time taken = 1.1x100kx3000u = 330s = 5mins 5secs.

If R is increased, on time is also increased.

Variable resistor has 3 pins and use middle one and one of the rest ones to connect.

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By: CBShishir http://www.circuitbasics.com/555-timer-basics-monostable-mode/#comment-1380 Fri, 08 Jul 2016 15:51:27 +0000 http://www.circuitbasics.com/?p=206#comment-1380 where is the description?

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By: Shane http://www.circuitbasics.com/555-timer-basics-monostable-mode/#comment-1341 Wed, 22 Jun 2016 13:31:52 +0000 http://www.circuitbasics.com/?p=206#comment-1341 Is it possible to make the led turn off while still holding the button?

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By: holz1100 http://www.circuitbasics.com/555-timer-basics-monostable-mode/#comment-1177 Wed, 27 Apr 2016 14:24:03 +0000 http://www.circuitbasics.com/?p=206#comment-1177 Is there any way to set the timer without pressing a button? Eg using the output from a logic gate? Also is there a way to set it so that the light is on the whole time and after the time (eg 2 minutes) it turns off and stays off?

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By: Chris Mortenson http://www.circuitbasics.com/555-timer-basics-monostable-mode/#comment-1073 Fri, 11 Mar 2016 12:19:56 +0000 http://www.circuitbasics.com/?p=206#comment-1073 Love 555 chips and the old 7401 chips

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By: Sony http://www.circuitbasics.com/555-timer-basics-monostable-mode/#comment-947 Wed, 27 Jan 2016 17:43:35 +0000 http://www.circuitbasics.com/?p=206#comment-947 Hello i have ckt which have 555.the ckt is on from 5 seconds to 18 seconds.i use potentiometer of 100k and capacitor of 1000uf,volts.now i want to increase timing from 5 seconds to 99 seconds.what changes i havt to do.plz tell me the value if pot and capacitor.plz help me.very urgent

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By: Circuit Basics http://www.circuitbasics.com/555-timer-basics-monostable-mode/#comment-788 Wed, 18 Nov 2015 07:05:47 +0000 http://www.circuitbasics.com/?p=206#comment-788 Hi Alex, if you place another resistor in series with resistor R1 from the diagrams above, you will increase the resistance and increase the time the LED stays on. If you put another resistor in parallel with resistor R1, you will decrease the resistance and decrease the time the light stays on. Hope that helps!

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By: Circuit Basics http://www.circuitbasics.com/555-timer-basics-monostable-mode/#comment-787 Wed, 18 Nov 2015 06:53:45 +0000 http://www.circuitbasics.com/?p=206#comment-787 This might be possible with two 555 timers, one in monostable mode set to 5 ms, controlling the Vcc of the second timer in astable mode set to 10kHz.

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By: Circuit Basics http://www.circuitbasics.com/555-timer-basics-monostable-mode/#comment-786 Wed, 18 Nov 2015 06:51:26 +0000 http://www.circuitbasics.com/?p=206#comment-786 Either capacitor will work, it will just change the time the LED stays on. A larger value capacitor will discharge more slowly, and make the light stay on longer.

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By: Alex http://www.circuitbasics.com/555-timer-basics-monostable-mode/#comment-767 Sat, 24 Oct 2015 14:40:39 +0000 http://www.circuitbasics.com/?p=206#comment-767 Could you say please how to add one more time mode, for exp. 15 and 20 seconds, maybe to add one more resistor but how to change modes and connect this resistor?

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By: Devin http://www.circuitbasics.com/555-timer-basics-monostable-mode/#comment-657 Tue, 28 Jul 2015 18:58:36 +0000 http://www.circuitbasics.com/?p=206#comment-657 I am a beginner here, and I’m wondering if it is possible to alter this design so that a 10kHz tone at 1V is emitted for 5ms, instead of lighting an LED?

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By: Balazs http://www.circuitbasics.com/555-timer-basics-monostable-mode/#comment-376 Mon, 18 May 2015 13:45:41 +0000 http://www.circuitbasics.com/?p=206#comment-376 if you used 100uF capacitor in the video why did you write 470uF in the text???

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By: Circuit Basics http://www.circuitbasics.com/555-timer-basics-monostable-mode/#comment-167 Sun, 05 Apr 2015 01:20:33 +0000 http://www.circuitbasics.com/?p=206#comment-167 Thanks Colin! You are right, the discharge pin opens, not closes to stop C1 from draining to ground. The post has been updated…

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By: Colin Mitchell http://www.circuitbasics.com/555-timer-basics-monostable-mode/#comment-164 Sat, 04 Apr 2015 02:53:45 +0000 http://www.circuitbasics.com/?p=206#comment-164 Also, the discharge pin closes and stops C1 from draining to ground

shoul be:

Also, the discharge pin opens and stops C1 from draining to ground

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