Charles, What is happening when a resistor is added across the diode? Is this shunting? If not, is there a term for this operation and also what is shunting? ...
I am looking to build a rain detector ... something that I can have indoors and switch on when I need it, and have it connected to an external sensor (or maybe...
I have been scribbling together a few simple plans which in some ways overlaps with yours, in which a laser beam would be modified by the fall of precipation...
You just need an electronic version of the weather rock! http://www.jeffowenartworks.com/FUN-Sculpture/WeatherRock/WeatherRock.htm Okay, sorry. No helpful...
Sure, that would be a correct use of the term. The circuit uses a certain amount of current for bias and charging the capacitor. Without the resistor, the...
I'm actually using that very detector right now thanks to a new garden project and it has held up for quite a while. I don't remember how long it's been, maybe...
Matt, FYI, I shot a quick video of your circuit and uploaded it to show some friends. It's at: http://media.putfile.com/PKE-breadboard-test The LEDs are...
Charles, Thanks, that helped! Jeff, I wouldn't call it my circuit. I see it more as everyone's circuit if that makes any sense. Feel free to distribute the...
Ah, yes. But let's build the real thing. [|:>) I like to reverse engineer technology from movies, so... Using simple dimensional analysis, the unit of measure...
Oh geez, what have I started?! :) Anyway, knowing that you'll tolerate this kind of silly stuff here, let me get into details...I'm not going to build a...
Charles, I think a pressure sensor is the way to go to detect ghostly emanations. A stretched aluminum coated mylar sheet about 10 inches in diameter charged...
Sounds like a big microphone. You are assuming the vibrations are very low frequency - could explain that "chill" feeling as the air slowly moves across the...
Are you kidding! Most of the stuff on techlib.com is pretty silly. Well, all of it, I suppose. I just like the smell of solder. I don't use schematic capture,...
Thanks for the tips! As far as I'm concerned, it doesn't have to actually work...it just has to APPEAR to work. Thus the need for the beeping and the blinking...
Hello, I need a phone ringer for some theatrical productions that I am doing. I am a sound designer and in my experience, it is far better to have a real...
The vertical flat side of the triangle with the connection in the middle is the input and the wire coming out the pointed end is the output. If you look up the...
refrigerator door alarm::::: i wanted to know how much watt beeper should be used in the circuit.. or will LDR do in place of CdS cell. If somme one could...
A CdS cell is a light-dependent resistor (see http://www.radioshack.com/product/index.jsp?productId=2062590&cp=&sr=1&kw=cds&origkw=cds&parentPage=search). The...
Thank you very much for responding, a couple more question (which I am sure will show how dumb I am about all of this). I am noticing that resistors come with...
Sorry but I have a couple more questions, even before you get to answer my last set... What sort of power source does this take? I see it is 12vdc, but what...
Charles (or anyone), Are CdS cells semiconductors? I suspect that they are, as I have used them in conjunction with LEDs(*) to control the termination...
The resistors can be just about any wattage that you are likely to find with the possible exception of the 10 ohms in the emitters. I might move up to 1/2 watt...
I don't see the adapter but the odds are it will work. I can send you that, too. In fact, if you twist my arm, I'll build the thing. I need some pictures and a...
Laurie addressed the questions but I have a couple of comments: I have had cells go bad due to humidity, losing their high-end resistance and in some instances...
Thanks Laurie and Charles, ... Is the damage permanent? i.e. dry them out and they work or is it irreversible? ... I was guessing about the lightning induced...
