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реле времени

своими руками

555

реле

задержка

усовершенствование

помехоустойчивость

таймер

самодельное

ne555

lm555

00:00:01

new time relay on a 555 timer chip

00:00:05

in which there are no problems the second

00:00:09

time relay about which they wrote a lot in

00:00:12

the comments here is a modified

00:00:14

time relay let's see how it

00:00:16

works press the button

00:00:29

previous roles could work

00:00:33

spontaneously when turning the

00:00:35

power on and off turned off nothing

00:00:40

happened, I turn it on, it also doesn’t work

00:00:50

when you turn it off, there is still voltage left in the capacitors of the

00:00:53

power supply, so

00:00:56

the relay is triggered because

00:00:58

some interference is occurring here now this is

00:01:02

not happening, we managed to remove it by

00:01:11

soldering this wiring, this ground

00:01:15

will be on ground and then all these

00:01:20

the tracks reset the capacitors,

00:01:24

which have one terminal connected to the ground,

00:01:26

here is the diagram, but they dug out the time, now

00:01:29

the transistor is not used, I will take that the

00:01:33

output current of the 555 microcircuits can be up to

00:01:36

200 milliamps,

00:01:37

so many mothers with the steering wheel can be

00:01:41

connected immediately to the kitchen, here is a simplified

00:01:43

diagram of this timer based on it, but

00:01:47

its low

00:01:48

noise immunity the fact is that there are

00:01:50

two comparators, these two pins are not

00:01:53

connected anywhere, these two are through

00:01:56

resistors which have a very high

00:01:59

resistance,

00:02:00

microcontrollers usually

00:02:03

put a pull-up resistor on the inputs or

00:02:05

something is already provided inside, but to that

00:02:08

extent there is no voltage at these

00:02:11

outputs they will be are equal to the voltage of the

00:02:15

surrounding space and ca

00:02:17

n’t be connected anywhere, so it is imperative that at the

00:02:21

input here, for example, there should be a

00:02:25

resistor on the plus side, that is, this move should

00:02:29

be either on the minus or on the plus

00:02:31

side, and it is desirable that

00:02:34

the resistance be as small as possible,

00:02:36

but the lower it is, the greater the consumption of

00:02:39

everything electricity, but if you need high

00:02:42

noise immunity, when resistance was carried out, you

00:02:44

needed less,

00:02:47

so they put a resistor with a

00:02:49

resistance of 4.7 kilo-ohms. Also, these

00:02:53

internal resistors have a

00:02:55

high resistance, so you can also put three resistors on the outside with the

00:03:03

same resistance, and on this 5th output this

00:03:09

will increase the noise immunity a little

00:03:12

here there was also a problem of problems in

00:03:16

that if you hold the button for a long time, then I

00:03:21

regret it will be turned on even if the time

00:03:24

that has passed after the elapsed time,

00:03:28

then the world should turn off, or therefore the

00:03:30

only way to

00:03:32

get rid of this is to reduce the

00:03:35

impulse that is supplied, that is, for

00:03:37

example, press the impulse button it

00:03:40

will still be short, it will use

00:03:43

a capacitor, and in order to further

00:03:47

increase the data stability, a

00:03:49

717 cartridge is installed here,

00:03:52

that is, here

00:03:54

you can connect any long cable here, nothing will

00:03:57

work out, it will not work because there is no

00:04:00

galvanic connection here,

00:04:03

when this transistor opens,

00:04:08

the voltage here sags to zero,

00:04:11

the timer starts when the transistor

00:04:15

is closed into the capacitor and discharges through

00:04:17

these two, that's all thanks for your attention if

00:04:20

you liked the video, subscribe,

00:04:21

like, go to YouTube

Description:

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