Hi, welcome to Electronic tutorial from Robojax. my name is Ahmad Shamshiri.
in this tutorial i'm going to show you a hack to modify this
555 relay timer module so you can have a reset switch and when the time runs
you can reset it at any time and also increase the time here by doubling
it tripling it or as much as you like. let's get started with this
This tutorial is presented from Canada
and if i turn it on you see that it takes 10 seconds to turn OFF
this long to turn off so we can increase the time.
i have separae video explaining this module fully with the specification data
sheet and how to connect this to ac and dc. and all
the details. but in this video we are just
going to show you how to add a reset switch so you can
reset the time as the time passes so you don't have to disconnect it
very easily for example right now it is off i can just reset it
simple as that and also increase the time
by twice three times as much as you like as you can see right now it's taking
very long. uses 555 timer ic
and as soon as you turn it on with the time that you set with
this potentiometer you could set between 0 to 10 seconds
and control a load and when this was turning on it controls the load
over the time it keeps it on and then it turns off.
but the time was the maximum was 10 seconds
now we can change it. to change that we have to replace this capacitor here
and here as you can read it says 100 micro farad
and i'm going to remove it from here and replace it
with a larger capacitor and the larger the capacitor the
longer the time that you can achieve.
Capacitor for longer time
i have to increase the capacity of this capacitor
this capacitor is 100 micro farad 50 volts because this is 12 volts we
have to have a capacitor equal or higher than voltage
so if your modulus 5 volts get 8 volts or 10 volts capacitor
and in this case (12V) i got this 220 micro farad 16 volts
so because because now this is 100 micro farad this is 220 it will be
more than double i'm going to attach it pay attention to
the polarity this side is negative if i turn this so you know that this
side is negative this side is positive and i'm going to solder this like that.
and here the negative on the other side. here
the capacitor have been soldered now.
Adding reset switch
now to add resist switch we want to connect it to pin 2 this pin two here
this is pin one this dot here this is pin one this dot as you see here
this is this has been pin one and two pin three pin four and then we
pin five six seven and eight
pin two and six are connected together and on and from this path and they're
connected to this pin of capacitor and this pin of the this
potentiometer. so we are going to solder
one wire to this pin of the potentiometer
and one wire to the ground this is the ground and this is a positive.
so between these two and here this is my push button
ready and here is my push button and here
i've soldered here one wire at this point
and the other one at the ground.
Wising Explained
this is my 12 volts coming for this bulb for demonstration you can put ac load dc
load whatever you want motor doesn't matter. so the positive comes to
the middle and it exits here the other wire just
comes here if you are putting if you're using
you're using ac loop put the live (hot) wire here at the middle and exit from here
Demonstration of reset switch and time
now let me connect the power.
so connected
you can look at the counter here
it is taking about 40 seconds with 220 microfarad
and that was the time so now let me put my counter again and i'm going to reset
it with the switch too so you can see that we can reset it one
two three and then let's count it
7 seconds now it's more than 10 seconds
15
20 seconds
25 30 seconds
39 seconds almost so this is how long you can get
and of course you can put larger capacitor
to get longer time
I would like to thank my Patrons from Patreon.com
Subtitle typed and corrected by Ahmad Shamshiri in Canada on July 24, 2020
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thank you for watching this was the hack and how to
add a reset switch and also the increase of time
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Related Videos
in this tutorial we are going to learn how we can use this
digital relay timer control with two display
that you can set the time between zero to 999 second
zero to 999 minutes or zero to 999 hours this can be used to control ac or dc
loot i got 12 volts version