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how to convert the signal received by Tsop1738 ir receiver to steady output?

Thread starter #21
Not 100%.
If one pulse is interrupted, then the output will go high for one pulse.
If the object passes so fast that it doesn't block at least one pulse, then obviously it can't be detected.

A block of one pulse is shown in the simulation below for an R1C1 of 31ms.
The output goes high about 33ms after the loss of one input pulse and stays high until the next pulse is received.

View attachment 113369

Thank you for your appreciated effort :)
 
Thread starter #22
Not 100%.
If one pulse is interrupted, then the output will go high for one pulse.
If the object passes so fast that it doesn't block at least one pulse, then obviously it can't be detected.

A block of one pulse is shown in the simulation below for an R1C1 of 31ms.
The output goes high about 33ms after the loss of one input pulse and stays high until the next pulse is received.

View attachment 113369

I test the circuit using simulator ..
when the input signal duty cycle about 6% it worked fine..


dc6.png


but if the duty cycle about 94% as my input signal the output as the following ,is there any problem ?

dc93.jpg
 

crutschow

Well-Known Member
Most Helpful Member
#23
I test the circuit using simulator ..
when the input signal duty cycle about 6% it worked fine..

but if the duty cycle about 94% as my input signal the output as the following ,is there any problem ?
Yes, I had your duty-cycle reversed in my simulation. :oops:
The problem was due to feedback from the input to the Ref voltage.
To cure the problem add a 1uF or larger capacitor from Ref to ground.
Simulation below with added C3:

upload_2018-6-13_8-48-7.png
 
Thread starter #24
Yes, I had your duty-cycle reversed in my simulation. :oops:
The problem was due to feedback from the input to the Ref voltage.
To cure the problem add a 1uF or larger capacitor from Ref to ground.
Simulation below with added C3:

View attachment 113390

it works ... Thank you :)

which missing pulse circuit is more efficient ?using lm393\339 or using 555 timer ?

Regards :)
 

crutschow

Well-Known Member
Most Helpful Member
#25
which missing pulse circuit is more efficient ?using lm393\339 or using 555 timer ?
You need to define "efficient" in this context.
They both perform the same function about equally well.
 

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