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I was trying to make this build up this sound activating switch, but i cont what kind of relay should i use. please provide me with a link when i can buy the right relay from ebay or amazon, or anyother place. thank you.. i attached the schematics thank you very much. k-36.pdf

Hi everyone, i am trying to build my own clap switch.. i found this schematic on Google and i liked it. But i believe this schematics works only with a single clap. what do i have to do to make it double clap switch(clap- clap ON, clap clap OFF) thank you for your time..

Hi there, I really wanted to build a POV display.. so can anyone please help me with the steps i have to do and the schematics too.. thank you I really appreciate it

I was working on this project and i connected everything according to the schematics, but i am facing one problem. when i supply power to the circuit(with no laser on the photocell) nothing is happening when it was suppose to sound, and with out changing anything to the connections when i apply power to the circuit again(everything the same) the alarm sound.... one time it sounds and one time it doesnt.. I am guessing there is a problem with the resistors and their amount, but i am not sure.. can you please help me find the problem and tell me how to correct it. Thank you I attached the schematics...

I went to radio shack to buy the scr and the told me they don't have it in store and I can order it online and when i went online there are alot of options, can someone tell me which to buy and some people told me I could use two transistors to make the current flow continuesly if so where do I add the second transistor? Thank you very much

Hi guys, i am a first year college student and this is my first project to build by myself.. and i need help. I build this laser alarm system and it works good. the Alarm sounds when the laser is broken and it stops when the laser is not interrupted. But the problem is when the laser is disturbed the alarm sounds but as soon as the laser touches the photocell again the alarm stops.. i was thinking, is there any way to make the alarm sound constantly non stop ones the laser is broken, Is it possible to make the alarm sound continuously without non stop unless it is stopped manually? Please look at the schematics and help me.. thank you