This is the datasheet for PC817.

https://www.farnell.com/datasheets/73758.pdf

Is the polarity on the power source correct? That is, PC817 pin-4 is more positive than pin-3?

 

The optocoupler shown has 4 pins. H11L1 has 6 pins.

https://www.mouser.com/datasheet/2/149/H11L1M-1010369.pdf

yes but it's an opto that I used as try to solve the problem when it gave the same result, I returned back to pc 817

 

This is the datasheet for PC817.

https://www.farnell.com/datasheets/73758.pdf

Is the polarity on the power source correct? That is, PC817 pin-4 is more positive than pin-3?

yes, its correct the positive on pin 3 then the resistor on pin 4 then the resistor to the negative of the power supply

 

yes, its correct the positive on pin 3 then the resistor on pin 4 then the resistor to the negative of the power supply

PC817 pin-4 is the transistor collector.
PC817 pin-3 is the transistor emitter.
Your polarity is backwards or you are numbering the pins incorrectly.

 

PC817 pin-4 is the transistor collector.
PC817 pin-3 is the transistor emitter.
Your polarity is backwards or you are numbering the pins incorrectly.

ohh sorry, numbering the pins incorrectly it's as you said

 

hi haman,
Is the problem now fixed?

E

 

hi haman,
Is the problem now fixed?

E

unfortunately, no.

 

hi haman,
I guess you have tried a number of PC817's with the same bad result?

Is it possible that you could post a photo, so that we can see the interconnections?

E

 

hi haman,
I guess you have tried a number of PC817's with the same bad result?

Is it possible that you could post a photo, so that we can see the interconnections?

E

yes, I did and I have tried h11l1, a3120 and 4n35 all with the same result
about the connection it's a bit messy because it's on a breadboard but let me try to arrange
it (it may take some time)

 

so here is the real kit connection


and this is the output (I didn't connect the opto)

 

One thing to try is to test the operation of the optocoupler alone with DC signals.
Drive the opto-emitter with DC voltage via a series resistor.
Test the voltage across the voltage source, resistor, and emitter with a DMM.

Then do the same on the photo-transistor side, with signal and without signal in.

 

One thing to try is to test the operation of the optocoupler alone with DC signals.
Drive the opto-emitter with DC voltage via a series resistor.
Test the voltage across the voltage source, resistor, and emitter with a DMM.

Then do the same on the photo-transistor side, with signal and without signal in.

yes, I have done this with two separated sources, and it works as expected when a voltage is applied on the input side I get an output on the resistor on the output side and vise versa

 

hi haman,
Perhaps a long shot but check for continuity on these sockets.

E

 

yes, I have done this with two separated sources, and it works as expected when a voltage is applied on the input side I get an output on the resistor on the output side and vise versa

Therefore, your optocoupler is working.
In order to see it work with the oscilloscope, you must ground the output side to the oscilloscope.

 

hi haman,
Perhaps a long shot but check for continuity on these sockets.

E
View attachment 352743

its connected checked by the alarm on DMM

 

Check the solderless breadboard as Eric has suggested.

 

Therefore, your optocoupler is working.
In order to see it work with the oscilloscope, you must ground the output side to the oscilloscope.

you mean like this?
if it is, yes, I did that, actually I know no other way

 

Try it with the load resistor R10 on the collector leg of the opto-transistor.

 

I will test your circuit and get back to you later today.

 

Try it with the load resistor R10 on the collector leg of the opto-transistor.

if you mean like this
it still the same result