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    Need ideas for a secure short range (3m) wireless system.

    So, I am working on an alarm system for my bike. As apart of that system, I would absolutely love to have it recognize me from a short distance, say 1 to 2 meters away, and deactivate the alarm and turn the accessories on. For that to work, I would obviously have to keep something on me that...
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    Some questions about an AVR based oscilloscope.

    So, I am looking at this project here: http://www.serasidis.gr/circuits/AVR_oscilloscope/avr_oscilloscope.htm I am not actually interested in building an oscilloscope, I am more interested in building a 120-240 vac 50-60 hz signal analyzer. I would like to build something for monitoring the...
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    How do I create an inductive switch?

    Good idea, I did not think about that. Thanks!
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    How do I create an inductive switch?

    How do I create an inductive switch? I know you can buy them, but I'd like to make one. Does anyone have any one know where I can find a circuit diagram of a simple inductive switch? Thanks!
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    [SOLVED] Dropout voltage concerns.

    Well, the fuss is, I don't want to break my electronics!! However, it never occurred to me that they would have a built in voltage regulator. Of course, now that you pointed that out, it seems stupid that they wouldn't. That's why it was so strange to me that there was such a large difference...
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    [SOLVED] Dropout voltage concerns.

    Thanks, that answers my question. Now I'm wondering how to get around this problem of 12v in to 12v out. I know they make low dropout regulators, but even if the dropout voltage is .01v, I will still run into the same issue. It doesn't seem wise to use a 20v regulator to power a 12v regulator...
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    [SOLVED] Dropout voltage concerns.

    I was actually referring to a 15V regulator for everything. I don't have an effective means of measuring the voltage under load. I doubt any of them are regulated, but the router, because of its 13.7v, might be. I'll just get a 12v regulator and run the modem, router, and answering machine off...
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    [SOLVED] Dropout voltage concerns.

    I'd still like to know what happens when you run a 12v regulator on a 12v source. I guess I'll just have to buy one an find out the old fashion way...
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    How can I clean some dirty AC from my generator?

    That and glow plugs are only used to start the engine. Once the engine is running they turn off. Do all alternators produce the a nice sine wave?
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    [SOLVED] Dropout voltage concerns.

    You are correct, they are running at 15.5V. If I where to hook them up to the battery directly though, wouldn't they get quieter and quieter as the battery drained? I was curious, so I checked the power supply's of my modem, router, and answering machine as well. The modem and router are both...
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    How can I clean some dirty AC from my generator?

    I will do that the very next time I get my hands on an oscilloscope. Sure, but not all diesel engines have glow plugs. This one for example does not. I suppose without seeing an actually picture of the output, it is a little hard to tell exactly what kind of distortion it is producing, huh? I...
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    [SOLVED] Dropout voltage concerns.

    I'm trying to build a basic power supply for a few of my electronics, which include my desktop speakers. My concern at the moment is the voltage dropout rating. I've never built a 12V regulated power supply that runs off of a 12V battery. I was looking at a LT1085CT-12 from Digi-Key. It has an...
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    How can I clean some dirty AC from my generator?

    Sorry for the delay, I'm still trying to get a hold of the manufacture of my generator to see what they can do, if anything... Well, the graph I made only shows the worst couple of spots. There are spikes and dips along the entire have form. I was just really lazy in drawing the graph. On the...
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    How can I clean some dirty AC from my generator?

    I'm not sure if this is the right forum to put this in, I'm not even sure if this is the right site to post this in, but I have a diesel generator that produces 120V AC via a badly regulated alternator. It was actually causing our ACP UPS's to go nuts and click on and off repeatedly. I finally...
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    [SOLVED] Is there a way to increase the breakdown voltage of a zener diode?

    I know it's not magic, I was only joking but thank you for the explanation...
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    [SOLVED] Is there a way to increase the breakdown voltage of a zener diode?

    Ooo... I like the magical doohickey! Thanks, that should work great! Edit: How do I mark this thread as solved?
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    [SOLVED] Is there a way to increase the breakdown voltage of a zener diode?

    Is there a way to increase the breakdown voltage of a zener diode? For example, take a 6v zener and combine it with a 1v zener to get a 7 volt zener? Maybe they make some kind of variable zener or an IC that would work like a variable zener? Thanks!
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    Can someone help me identify this part?

    That sounds reasonable enough to me, but that thing isn't in series with the resistor, it's in parallel... The main reason I wanted to know was because I thought it was some kind of weird voltage regulator or something. I thought it was weird that the AC voltage drops like that without a...
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    Can someone help me identify this part?

    Thanks for the reply. That's what I kinda thought it was at first, but shouldn't it say 564KF (minor detail)? Then wouldn't that make it a 564,000F capacitor!? At 400V, that thing would be massive!! I've heard of AC caps, but I always thought they were rare, and expensive. Then I wonder where...
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    Can someone help me identify this part?

    I'm not sure what it is, but it appears to take 120V AC and turn it into about 18V AC. The only markings on it are 564K 400V, not very helpful. I've taken a couple of photos and drew up a wiring diagram. In the photos, it is the large red thing. As far as the schematic goes, R1 is a 100 ohm...
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