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  1. dave9

    Lead acid battery

    I have MANY Eneloops and those relabled to other brands, that have remained at a useful capacity to me for much longer than 5 years. I would go this route, but if you need more than about 2000mAh per cell, my 2nd choice would be the Tenergy Centura low self discharge, available at amazon among...
  2. dave9

    IFR FM/AM 1500 battery turns itself on and can't shut it off.Manual has no schematics

    I'm a little confused. It has no power switch? If it has one, which the manual seems to indicate (unless I have the wrong "IFR FM/AM 1500") maybe the switch broke internally and just needs replaced. What does this have to do with "battery" unless you mean you wouldn't mind it staying on...
  3. dave9

    Beginner Amp Hour Question.

    This is incorrect/poorly worded. It couldn't use a series of cells to achieve that 64.8Ah at 3.7V, but they might have used the # of cells in the battery multiplied by the Ah rating of each to come up with the equation to produce this (probably incorrect) spec.
  4. dave9

    Beginner Amp Hour Question.

    The power supply specs could be an issue. 1) If it uses a lead acid battery, you won't want to drain that deeply or else it will have quite a bit fewer recharge cycles. It helps a lot to use a deep cycle battery as suggested in your linked document but lead acid tech still results in a far...
  5. dave9

    Question storage dvd media and ziplock and silica gel

    No! If for some bizarre reason your DVD case is wet, let it sit there open to dry out before storing the DVD in it. You do not need silica gel at all. You do not need a ziplock bag. You need a new hobby. :rolleyes:
  6. dave9

    Question storage dvd media and ziplock and silica gel

    You seem to be on the wrong forum, and yet there is no point in doing this. If your case is damp (??), leave it sitting out open to dry to the ambient humidity level. This is the same level the DVD is and it has probably been exposed to ambient humidity its entire life. Light is the main...
  7. dave9

    Question plastic and rubber

    There is a language barrier here and you might as well stop trying and instead post in a forum fluent in you native language. Or try harder, whichever the impediment might be. It is senseless to ask overgeneralized questions without a specific product, purpose, and environment. If you don't...
  8. dave9

    Question plastic and rubber

    1) You have not adequately expressed what the problem is. If the type of plastic and/or rubber you are using is resistant to silicone oil (consult material - chemical compatibility charts) then choose a viscosity of silicone grease adequate for the lubrication needs. Silicone grease will...
  9. dave9

    Chip Burns Out

    Rubbing your fingers around on live circuits is improper procedure. Use an infrared thermometer. E L E V E N D O L L A R S ! :D
  10. dave9

    plastics electronics crack

    Penetrating the cracks is not a long term solution, would only serve to hold the material together in the right diameter for the screw while you either fortify the surrounding plastic with an overmolding (filled with epoxy was my suggestion) or to mechanically fix the socket from the front or...
  11. dave9

    plastics electronics crack

    Looks like those are to attach sockets to a chassis back panel, yes? First, use cyanoacrylate glue (aka Superglue), the thin type not the gel type. Apply sparingly into each crack, and use a C-clamp to hold it together until it dries. This is just to return the piece to the original...
  12. dave9

    CB/ballast on a OTTlite

    ^ Or they have "Used Very Good" one for $21, so you get a working ballast, bulb, then take the left over carcass and do that LED retrofit I mentioned previously. It looks like a wonderful host for that as long as the heatsink isn't heavy enough to prevent its hinges from holding the desired...
  13. dave9

    Off grid house lighting

    Go with the 200W panel and if it's not enough you then need to calculate through real use and worst case estimations, whether you need another 200W or can get by with adding only an additional 100W in parallel. You might even need far more than that if you need to put a heater on them to melt...
  14. dave9

    PSU Silverstone ET550-G dead after thunderstorm (turned itself off)

    Then again this is an electronics forum. If you're a gambler and a DIY type of individual who would rather buy tools than pay someone else the labor, with the idea that you might not do much better than break even (??) but have the tools to use again next time, then there exists the possibility...
  15. dave9

    Possible switch overload?

    If I take everything you wrote literally, then no, you cannot use a single SPST switch. It does not matter that both will either be on or off, it matters that they have to remain separate circuits because they operate at different voltages. If you had instead wrote that you intend for this...
  16. dave9

    PSU Silverstone ET550-G dead after thunderstorm (turned itself off)

    Even if the fuse is blown, don't replace it yet. Odds are your primary side switching transistor(s) (mounted on the longer heatsink) are blown and will need replaced first, or possibly a bridge rectifier diode pack (or both). As far as "bring it to technician" to do anything, you will probably...
  17. dave9

    Bluetooth connectivity

    If you changed the module you may have to go into every device and pair it again.
  18. dave9

    powering 36 DSLR cameras from a single powersupply

    ^ To measure battery drain of various devices I made a (similar?) thing, I used copper clad fiberglass board so thin that the surplus place I bought it from called it "scissor cut", and indeed the giant Wiss scissors I have can cut it. I soldered wires onto both sides of a long thin strip of...
  19. dave9

    Vehicle Wiring: Actuation Speed Sensing on SPST Switch

    Won't this have to be constantly powered so it's a parasitic drain on the battery when the engine is off? I suppose possibly you could put a capacitor on the high beam circuit to derive the switching circuit power, to give it enough power for "n" seconds. Frankly it seems excessive relative to...
  20. dave9

    Voltage Drop and Cord Length?

    It would probably be more effective to have just detailed what these circuit(s) are, and whether your power source is regulated in which case you should be able to roughly calculate the voltage drop as the series of resistances the wires impose. Generally if power delivery, use a lower gauge...
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