Recent content by hamoodyjamal

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    School Science Fair Project - NEED QUICK HELP PLZ

    Hey all, I have to complete a science fair project within 5-6 days and I need help. My project should be quite simple. The idea is this: There will be an LDR in a small box with a transparent window. When the observer covers the transparent window with his finger, a small door will open. And...
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    Camping Music Box - PROJECT

    Hi, I have a simple solution for you. However, it does not include a Solar-cell to charge the battery. I have done this 3 times and worked great! All you need are some simple desktop speakers, and a rechargeable battery (or you can use normal batteries). The thing is, most simple desktop...
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    Infrared Activated Switch

    Im baaaack! Wow, that took longet than i expected. Was fun though. I see someone has built this project, or part of it. and is having some trouble. I couldn't quite understand what he/she wrote. Maybe you can shed some light on it? I presume the cuircuit i should build works fine???? you...
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    beep or chirp sound

    You can build one your self. Just use a 555 timer set to say 500Hz (the frequency should be between 20Hz to 20KHz - human ear range) to drive a small speaker. Basic really. Yet again, you can always use a buzzer, or a relay (thats right, sounds wierd but true i can tell you if your interested)...
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    Brainmachine

    Thanks Ante. Really!!
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    Brainmachine

    Hi Ante, I found a website (using the google cached feature) but its blocked by my ISP, i think its becasue the link has the word H A C K . It doesnt have any hacking guids or anything that i know of, i dont know why they would block it. What i have in mind, is that if you (or someone) could...
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    legal transmitting questions....

    Your welcome, Well, common sense would tell you the shorter the range, the cheaper, and sometimes this is the case. It all depends on what circuit you build of buy. You can try one of these circuits http://home.att.net/~wzmicro/avsender.htm...
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    Brainmachine

    Hi all, I once came accross a product which helps you... well, its like these glasses with LED's mounted on the lenses and you plug the glasses to the computer (via a cable ofcourse) and then you download these files and open them in a program, which in turn will turn on these Red and Green...
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    Infrared Activated Switch

    Hi, Im gonna be out of town for a week or so. Going to my sister, hehe, cant wait ;D I wish i can get on with this headache project and just finish it. Later!
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    legal transmitting questions....

    Transmit video --> Possible To the whole Town --> Not so easy. Needs expensive equipment Legal --> You need to buy a liscense. That ofcourse depends on your country.
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    Infrared Activated Switch

    Hi, I changed the pin numbering accordingly. Is this better? Also, are the "Inverting" and "Non-Inverting" Pins arranged correctly? Tip: Pins 3 and 5 (+) are "Non-Inverting" and Pins 2 and 6 (-) are "Inverting". Thanks ;D
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    Infrared Activated Switch

    HEHE, silly me. I used the image of the 307 op-amp and just labeled it TL072. Sorry. :-[ I'll see to the project ASAP. Thanks ;D
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    MP3 PLAYER

    Hi, Ive seen devices where you can plug in them a USB Flash disk (any) which has MP3 files and then you plug the device in the cars lighter socket (for power) and this device has built in FM transmitter so you can listen to the MP3's on the radio. You can dismantle it and make your own...
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    Infrared Activated Switch

    Hi, Is this circuit what i should be building? Also, can you check if the op-amps and the photodiode (especially) are arranged correctly. If they're correct, ill just set my 555 timer to 100KHz. BTW, my sister gave birth yesterday. So i might not get to the project very quickly. HEHE, im an...
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    Infrared Activated Switch

    Hi, BTW, why do i need an op-amp in the first place? cant i just connect to the input of the NE567 to a photodiode? or is there not enough power? Also, since the photodiode is a photo volatic cell, will it not give power to the input of the NE567? The above 2 questions sound similar. But im...
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