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here is the picture
thank you for the info, my alarm finally works, but there's a new problem, when you interrupt the beam alarm goes on but it turns off by itself as you stop interrupting the laser beam. it supposed to keep buzzing until i manually reset it with the switch, but it's not. according to my friend he said that the timer has no reset option, but your post tells the otherwise, how can i fix this? thank you once again for answering my questions
There it is, Vcc is fine(6v) but it keeps buzzing even when i close(no light) the photoresistor (which i manage to find, and i'm not sure what its resistance my friend said its 10k) r2 is 10kohm and r1 is 100ohm i follow the exact diagram u posted, please help me its due next week.
I try making it, I still failed, These are my components, 2 100ohm resistor Phototransistor 2 terminal555 timer, SwitchTried on breadboard still not working
I have pictures of it might be hard if post it here can i send it to your email instead? Im building this for my class project and i need your guidance, im still new it this things
I have a question, I can't get a photoresistor, instead i bought a phototransistor, what should i have to accompany it and is the step on making it different? Thanks and sorry for bad english