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    e meter/wheatstone bridge

    I'll leave it to others better qualified to help you with the electronics, but I just wanted to say: Congratulations on disconnecting from the organization that requires use of the "official", sanctioned, and poorly-made e-meter. I suspect they actually do make it within the organization itself...
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    Ultrasonic pest control

    For some reason, I can't edit my former post. I want to add that the Wikipedia quote is followed by source references, which I leave to OP to follow up on, or not. EDIT: Now this is odd. The forum is letting me edit _this_ post. But it still won't let me edit my 1st post.
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    Ultrasonic pest control

    From Wikipedia: "Ultrasound generator/speaker systems are sold as electronic pest control devices, which are claimed to frighten away rodents and insects, but there is no scientific evidence that the devices work."
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    Help with DSC alarm pc2500 smoke detector circuit error

    I apologize for taking so long to respond to this thread. I've been having trouble with my internet connection. I want to help you. I really do. But I've run into difficulty. I haven't worked on a PC2500 board in, probably, 15 years or more, and I've had to pull up the Installation Manual to...
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    Unknown Component Identification Help Needed

    I think bertus might have it. The barbell-looking component in the center of the glass enclosure looks like it's free to tilt when the device tilts. Does it? Telling us any details like that will make it easier for us to help. The "barbell" looks like it's suspended from some springy...
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    Help Identifying a Component

    Correction: My earlier post was off the top of my head and in the wee hours of the morning, and I didn't think to check before posting. Don't know what I was thinking, but a silver band on the end of your disintegrating resistor indicates a +/- 10% tolerance, not 20%; and a gold band would be a...
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    Help Identifying a Component

    Assuming it has a common value, I think it has to be a 390KΩ resistor, +/- 20%. Can't really tell its size without something for scale, but I'd guess it's 1/4 Watt. I'd replace it with 390KΩ +/-10%(gold band instead of silver), 1/2 Watt (slightly larger) to be sure. Resistors are cheap and...
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    Radionics D5200 Programmer Assistance

    Thanks for posting back with that info, LeeBur. My expertise with Radionics was extensive up to 1992, especially with the now-antiquated D4112, D6112, and D8112 Panels, all of which were programmed with the D5100 Programmer. In mid-1992, (just before my company sold its assets and left all...
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    Which type of sensor works for pigeons within 20 feet without tripping when a skytrain drives by

    Um, no. At whatever the frequency the radar/microwave (which is the same thing) operates, it's still subject to the inverse square law of attenuation that we all learned (hopefully) in high school: All other factors equal, a given reflecting surface at twice the distance will bounce back...
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    Which type of sensor works for pigeons within 20 feet without tripping when a skytrain drives by

    I very much doubt that what you want can be done practically. Off-the-shelf motion sensors of the type used in alarm systems (or the less discriminating types used in turning on lights) can probably be used to detect pigeons at 20 feet out from your balcony. The problem is what's known in the...
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    Automatic chicken door

    Typical garage door beams have two different parts of a beam (usually IR) on each side of the door: One unit is the IR transmitter and the other is the IR sensor-cum-switch. The switch is the two contact points of a NO (Normally Open) relay. As long as the receiver "sees" the IR beam from the...
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    Radionics D5200 Programmer Assistance

    LeeBur, Radionics panels sold after mid- 1992--which I'm pretty sure the D2212 Control Panel was---was encoded in firmware such that any D5200 programmer had to contain a dealer-specific code to access panel programming. In other words, only D5200 programmers once owned by your installing...
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    New here and looking for advice about a PIR activated stepper motor and audio source.

    I was thinking maybe I'd try covering the roof with some mouse sticky-traps, https://www.ebay.com/sch/i.html?_from=R40&_trksid=p2380057.m570.l1311.R1.TR7.TRC1.A0.H0.Xmouse+glue+.TRS0&_nkw=mouse+glue+traps&_sacat=0 But anchor them on plywood or something light enough not to strain the roof but...
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    IR and seeing it...

    I wouldn't count on the barrage balloon any time the air isn't perfectly still and there's no fog or clouds between the beacon and the balloon. You will have pretty much the same problems with IR that you have with visible wavelengths. The only advantage I can see to using IR is that it won't...
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    Chasing down excessive power consumption

    First of all, I assume you're talking about smoke alarms rather than smoke detectors. The difference is that detectors do just that, detect the smoke. If it has some sounding device built into the unit, it is called a smoke alarm. Smokes powered directly from mains AC power are nearly always...
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    Woo-Woo Is there a way to verify if the Aluminium mesh I bought is made with aluminium?

    Just curious, have you tried wrapping your phone in aluminum foil? I can't attest to it personally, but I've heard a lot of praise for aluminum foil as an RF shield.
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    Electrolysis hho generator

    You're right. Thank you, I stand corrected. It's been quite a while since I studied any chemistry. Yesterday was the first time I read the term "hho generator". Ah, yes, I'd forgotten about that particular problem. Thank you again. The one outstanding problem I remembered was the shift in...
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    Electrolysis hho generator

    HHO isn't the conventional way to write H2O (dihydrogen oxide), but it's not exactly wrong, just as it's not wrong to write water as hydrogen hydroxide, HOH. In certain chemical equations, it's convenient to think of water that way, e.g., 2Na + 2HOH --> 2NaOH + H2. I don't dispute that...
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    Electrolysis hho generator

    Yes. Assuming everything else you're using is the same (water, electrodes, AC or DC adapter output), then one of two things will happen. (1) The few bubbles and greenish water will form faster; or... (2) The adapter will toast itself, or blow an internal fuse; or if it doesn't have an...
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    ITI SX-V Alarm system

    MLCANADA, I'm pretty sure I have that programmer somewhere in all my old stuff I could never bring myself to throw away. It may take me some time to locate it. If memory serves, I got it without the connector cable, which I think I also have in some _other_ forgotten location, but in any case...
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