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  1. C

    This might be a fun disscussion :)

    @Jimmerman : 짐머 맨, 환영합니다. (나는 한국어를 말할 수 없다. 난 구글 번역 사용. ) ;)
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    Car Battery/Car Alarm/Capacitor Question

    Thanks for the update, Computer-Joe. That was really puzzling me before you found the exposed wires touching. I'm not expert in car alarms, but it didn't sound right that _any_ alarm designed for cars would put that much drain on a battery. For what it's worth, I agree with Gyrd3: The...
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    Help with a flashbulb project

    The "Japanese" on the instructions is all in Kana, their phonetic script, which actually can translate pretty well into English. I copy-and-pasted it through Google Translate and here's what I got so far, starting below MONO WIRELESS...
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    Charging 6 volt battery with a 12 volt charger and small lightbulb

    Your charging arrangement isn't charging your 12V and 6V batteries up to anywhere near their full rated capacity. That might be because of the charger itself, or the charging method; or it might be because the batteries are old or hard-used and just won't hold a full charge any more. Whatever...
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    How do I test a Battery?

    AAGH!! Sorry I didn't look at this thread earlier. Jeff, first of all, DON'T test the battery by draining it. Draining any rechargeable battery that low will shorten its cycle life drastically. What that test would show is how much storage capacity ( in Ah) the battery had BEFORE you tested...
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    my power supply device rated 13.8vdc output but I've test it and the output voltage is 26.8vdc

    A brand name and model number might be helpful, or even a good picture(s) of the device showing any markings in English (markings in Chinese won't do most of us any good). Some popular power supply devices here in North America can give either _nominal_ 12VDC (actually closer to 13.8VDC in...
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    Back to back AAA cell whim, bad idea?

    Just now saw this thread and decided I'd throw in my 2 cents: Assuming alkaline cells, with the 2 cells trying to push current in opposite directions, and assuming there are no barriers to current flow in the direction of the highest-voltage cell (e.g., a protective diode to guard against...
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    What does this OLD power cord go to?

    No, that's an AC plug and Edison would only use DC. ;)
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    Help finding a switch

    How do you work that switch?! Trained ants?
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    Connect several wires without relays?

    Your objection to using relays--I assumed electromechanical relays, with electomagentic coils and mechanical armatures with physical contact points--seemed to be their size cluttering up the board. That's why I suggested transistors instead. They're smaller and many can fit on a PCB without...
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    Connect several wires without relays?

    Look up switching transistors, aka solid state switches, aka solid state relays.
  12. C

    UPS battery

    It sounds like your battery no longer is charging up to its rated capacity. If you're calculating your "50%" based on the rated capacity instead of its actual capacity after a lot of use, then your figures will be off. If you're draining your battery down completely when you use it, then your...
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    Comedy Thread

    There is nothing wrong in the picture above of the girl using her flesh-colored steel prosthetic hand to do bench work.
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    Immersion water heater in a metal cup

    Wow, I've had one of those things for as long as I can remember. I never realized I was living so dangerously. No, wait, mine wasn't made in China, no chrome plating and 120V instead of 220V. It's much safer than my last immersion heater.... ;)
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    Honeywell 5800 help please

    Joe, I had to search a bit to find out what you're talking about. My first knee-jerk reaction was "There's no such thing as a Honeywell 5800 Control Panel, but, low and behold, when I searched I found it. https://www.obsoleteradionics.com/honeywell-5800-control-panel.html And discovered it's...
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    Looking for a specific transformer

    15 VAC transformers (mostly using a 115-120VAC primary, since you're in the USA) https://www.ebay.com/sch/i.html?_from=R40&_sacat=0&_nkw=15VAC+transformer&_sop=15 Electric-T, you seem to have multiplied your primary (input) voltage times your secondary (output) voltage, but I can't imagine why...
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    Call or Signal Box for Warehouse

    I'm an alarm technician with decades of experience. I have run many many siren/bell cables over distances of 200-300 feet that carried more than 0.5A and never had a problem. Some sounder/strobe circuits have to carry several times that load. The resistance/voltage drop in 18 AWG wire is...
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    Call or Signal Box for Warehouse

    Just to be precise, it's common in industrial Fire (and possibly environmental) alarm systems. Security alarm systems virtually all run on 12 VDC these days.
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    Riddle

    Same here, about 50 yrs ago, but it was three traveling salesmen sharing a motel room @ $10 ea. but the night manager had neglected to give them the 3-fer $5 discount. The person who TOLD the riddle didn't know the answer and in fact--and this is true--honestly believed that the riddle had no...
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    Hiya frae Edinburgh!

    mìle fàilte, Terry. I had the good fortune to spend half a year on the opposite coast (Prestwick / Ayr) during my military service and fell in love with Scotland. How could anyone not? Anyway, best wishes on your ventures.
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