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  1. dave9

    Series capacitor on fluorescent 125w T12 light fitting

    Can you find documentation for the ballast? Or a label on it specifying the requirement? Are 8' T12 common in the UK still? In the US most people aren't doing new installations with them, instead phasing them out for 4' T8 (tubes easier to install, transport, cheaper) or conversion to LED...
  2. dave9

    What is this Soft SMD Standoff?

    Why? I doubt there is anything about the device that needs such an arrangement. The felt or whatever it is, would still need an adhesive to attach to a metal back plate, and the adhesive could directly attach it to a PCB instead. It seems more like a hack to fix a manufacturing/design...
  3. dave9

    Fixing Technics Speaker

    Yeah I had just assumed a different input was tried.
  4. dave9

    Need help to identify a component!

    I'm going to guess it's an NTC thermistor, and that hopefully there are markings on it to tell you what value replacement part is needed, or IF it looks EXACTLY like the other one on that PCB, then I'd remove the other one and measure its resistance at 25C temperature to pick a replacement, one...
  5. dave9

    Fixing Technics Speaker

    Bi-amp setup. Looking at wires in pictures gives me a headache so just triple check that all wires go where they should. Odds are the amp itself has failed. If you feel capable of safely troubleshooting a live AC powered amp, own tools like a multimeter and soldering iron, then it would be...
  6. dave9

    Added a second battery to my tablet

    ^ That the topic exists at all should be evidence enough, unless Pssdof is just making up fiction or misunderstanding how to check the battery life.
  7. dave9

    Added a second battery to my tablet

    ^ Sure, but if it displays battery full at 4.2V, doubling battery capacity does not change that. IF it has to be calibrated to correctly display remaining charge once it has begun to discharge, doubling capacity does change that. Apparently it is not the case that all tablets determine...
  8. dave9

    Added a second battery to my tablet

    ^ It makes sense when the device is calibrated to a specific battery capacity and has a background app that shuts it down at a certain % remaining charge. In such cases when you "upgrade" the battery you need a method to recalibrate for the new capacity, method meaning sometimes there is an...
  9. dave9

    Electricity Consumption for Ceiling Fan?

    ^ True but mine does fine for relieving the hot spot in front of the stove without any audible noise, running at low speed. The extra heat in the kitchen is fine by me, I just don't want it rising up in my face while tending the stove which is what a vent hood does. The rare times I fry I...
  10. dave9

    Electricity Consumption for Ceiling Fan?

    Rough idea of what? Define what your comfort is worth. Fans don't use much power, at a heat source can be just as effective or more so than central air trying to make the whole home cooling to combat one area. However you only have an "idea". A ceiling fan can cost anywhere from $20 on sale...
  11. dave9

    Wiring Batteries?

    Dual spot weld nickel plated tabs to the batteries then solder the wires to the tabs.
  12. dave9

    EMI Filter for washing machine

    I've seen a lot of this kind of posting recently on forums. I've coined the term Nonsensebot for it. If one can't make the effort to detail their goal, or don't know what they're talking about, either way the question is either a premature waste of time or a complete waste of time...
  13. dave9

    What is this?

    Considering $20 price point, probably the entire battery interface board handling both charging and discharge limits. Don't omit it, fire could result.
  14. dave9

    I dont know what is this component in my circuit

    Report the teacher to higher authorities. S/he shouldn't be in control of students if this is what they're being exposed to.
  15. dave9

    Added a second battery to my tablet

    AFAIK that would be a manufacturer and model specific app while you didn't mention your man./model. I'd do a web search for [model name] recalibrate battery.
  16. dave9

    Enlarging hole in reflector?

    ^ That is true with incandescents (having a spot point of filament light) designed for throw, but to a lesser extent with LED retrofits and flood beam reflectors. The design of the LED bulb often swamps the rest and the more sideways oriented LEDs there are, the more disfigured and floody the...
  17. dave9

    Mono amp feeding both stereo and mono headset without shorting out

    Seems most straightforward to just add a 2nd, mono jack in parallel.
  18. dave9

    Enlarging hole in reflector?

    Since you have no belt sander, mark a line showing what to remove and do it manually with a piece of sandpaper taped to something flat like a piece of glass or a counter top checked with a straightedge. Rinse (not wipe) any stray abrasive particles away so you don't scratch the reflective surface.
  19. dave9

    Interesting PCB production method

    There would have to be bleed to whatever extent the panel had a viewing angle other than 0'. It would just be lower intensity so a little exposure time increase.
  20. dave9

    Converting Double Insulated Light To Faux-Case Grounded

    Right, not isolated which is why the topic talks about earth grounded heatsink. The topic started out already a step past that. The mPCB backing and heat spreader plate are not connected to AC, would not be unless heat delaminated the mPCB tracks, or the solder joint for the mains cable broke...
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