Hi check your pins on your opto isolator. You need to be using the right ones on the front end. The led needs to flow through the optos pins on one side and into the resistance and back to ground. If its not hooked up right you wont complete the circuit and the led wont light
Is it possible that your led is blown? I used a 12v led, Im not sure if thats essential or not. The led is like a diode too I think, it needs to be installed the right way. Sounds like you have had luck anyway, its probably just how you have your opto isolator wired up. Look up a tech sheet for the part you are using if it isnt the h11d1. Trace your finger from your output pin on the 555 through the led and then through the h11d1(or other) into the resistance then back to negative. Once you get that going you can figure out the other side.
By the way. I put that led in the circuit when I was learning it for a visual reference, it probably should be taken out once you are competent with the configuration.
Is it possible that your led is blown? I used a 12v led, Im not sure if thats essential or not. The led is like a diode too I think, it needs to be installed the right way. Sounds like you have had luck anyway, its probably just how you have your opto isolator wired up. Look up a tech sheet for the part you are using if it isnt the h11d1. Trace your finger from your output pin on the 555 through the led and then through the h11d1(or other) into the resistance then back to negative. Once you get that going you can figure out the other side.
By the way. I put that led in the circuit when I was learning it for a visual reference, it probably should be taken out once you are competent with the configuration.
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