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  1. dave9

    DC 9v replacement

    The one you linked should work. You'd just be paying a few dollars more for the voltage adjustment feature and extra tips, though having both the 2.1mm and 2.5mm I.D. tips, eliminates the need to guesstimate which it is... though from the picture I'd guess it's 2.1mm. Sometimes I guess these...
  2. dave9

    DC 9v replacement

    I'd imagine it's set up that way so it still functions at the end of the discharge curve for 8 series cells, closer to 8V. On the other hand, this also means it is 12V tolerant and would have higher output power at 12V, as well as 12V brick AC/DC adapters being more common... he might even...
  3. dave9

    DC 9v replacement

    It can't use much current at only 9V. I'd seek a 1A @ 9V supply. The other factor is the connector, does it use a typical DC barrel socket for power input? If you don't find a power supply with a mating connector then you'll need to buy a connector separately and solder it on. The two most...
  4. dave9

    Why relay contact stick even when power off?

    I'm not so sure 10 years is long enough. I seldom buy anything I intend to use for only 10 years except tech with short lifecycles like phones and computers. Take my furnace for example, the relay on it failed, was soldered on and had a vent hole. I can't recall if it was covered with tape...
  5. dave9

    fuses not doing their job

    But how often is reasonable to replace the fuse? It can be more of a problem if the occurrence rate and/or surge level is large. The driver you're referring to might also be made more robust than a little 3A cheapest-source-possible switcher for a gate. It seems more anecdotal than...
  6. dave9

    Why relay contact stick even when power off?

    I have wondered about this factor in general (not specific to this topic). What is the standard for "clean"? Many times I have seen various relays in devices which weren't meant for particularly dirty environments yet that nub, or sometimes a piece of tape over a hole instead, was left...
  7. dave9

    fuses not doing their job

    If you are stating the only reason you're having problems is power line surges, then you need a surge protection circuit. A fuse alone will not prevent a damaging level of voltage getting through to the PSU. However if your power is that bad you may need whole site surge protection. If you...
  8. dave9

    fuses not doing their job

    More specifics needed. What gate motor and PSU, and were they meant to be mated together for this application? What is "blow the power supply as well as...", what exactly failed at the discrete component level? If the motor blows the PSU, wouldn't you need the motor replaced or choose a...
  9. dave9

    Input power vs Output power in pro amps

    You could say they caved in to trying to combat the false nonsense specs others state, or you could say they are just another part of the problem. It's somewhat irrelevant. If you want to dive into audio, you're going to get your feet wet and have to hold your breath for a while because the...
  10. dave9

    Input power vs Output power in pro amps

    These kinds of amp ratings have been going on for decades, nothing new about it, though if designed with low weight as a criteria, you could get 700W RMS out of something weighing only 9 lbs if it were class D.
  11. dave9

    Woo-Woo LED Magnetic Lighting: Is it for real?

    Links to multitudes of videos ?
  12. dave9

    Need replacement capacitor but value not readable

    It's a (now Kemet, originally Rifa) class Y2, 250VAC, metalized paper, EMI suppression cap. The 40/100/56/C is just an IEC Climatic Category rating. There is no way to determine the capacitance value based on the markings remaining. They're available in capacitance range of 0.001 - 0.1 uF and...
  13. dave9

    Rotary tool - what battery V and what Vmax for motor?

    1.4V per cell is about what you can expect from NiCd or NiMH at full charge, then rapidly dropping to 1.3x-something and nominal 1.2V. If you have a 6V battery, I would just put a couple diodes in series to drop ~ 1.4V, test it, and if the motor isn't getting hot maybe swap (what I defaulted to...
  14. dave9

    Rotary tool - what battery V and what Vmax for motor?

    If the original wall wart was 3.6 to 3.9VDC and a regulated switcher, it could have only had two cells in series. They wouldn't have gone to the trouble of putting a voltage boost board in to charge the battery instead of a higher voltage supply. If it was an unregulated line frequency...
  15. dave9

    dehumidifying device

    We should just ban this poster. It is a waste of all our time. Every single thing, has had an obvious solution if any were needed at all. Gamer87, you literally cannot be this ignorant in the internet age. Anything you have asked about could be resolved with a web search. Do your own work...
  16. dave9

    dehumidifying device

    ^ No that is just a plug in heater, will do nothing to reduce room humidity. If you put a wet shoe over it, the heat might make the shoe dry faster but that would result in higher room humidity. If you put a mountain of silica gel in it, with it OUTSIDE the room to dry the gel out, then moved...
  17. dave9

    dehumidifying device

    How about a mountain of silica gel? :D Everyone wants inexpensive and efficient, which is why they buy compressor based air conditioners. It is the least expensive way to get the job done once you factor in power cost, let alone heat reduction. Since you have a very high humidity area, you...
  18. dave9

    dehumidifying device

    Peltier tech has VERY high energy consumption (poor efficiency), you will pay more in power than you save on buying that type. Compressor type is by far the most efficient and the best option. In summer that should be an air conditioner which is the same tech except it exhausts the heat...
  19. dave9

    Lead acid battery

    I recall that even 40 years ago, GE (General Electric) was putting sub-C NiCd cells in their D casings.
  20. dave9

    Lead acid battery

    EEVblog did a youtube video on the Energizer (& 2 others) NiMH D cells recently: AFAIK, "most" manufacturers are putting a sub-C (or at least the internals from that size) inside a D sized shell. I've never come across an RS cell as shown in that video, and can find no info that it is LSD...
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