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  1. dave9

    3V battery circuit / back lit rocker switches

    You are unlikely to find a rocker switch set up to illuminate at a range that coincides with your variable battery level, 3V down to 2V drained, but do look around if you wish. The alternative then is find a different rocker switch, one with a clear indication it can be non-destructively...
  2. dave9

    Converting Double Insulated Light To Faux-Case Grounded

    Well, that's part of why I asked what others would do and I appreciate your feedback. Case grounded equipment isn't rare. I could probably even manage to shoehorn in a ground fault circuit though most case grounded equipment doesn't have one. Willy nilly though? I can't even count the # of...
  3. dave9

    Computer electronic component problem?

    I would as soon assume the screen going blank was a problem with the monitor. PC instability tends to cause bluescreen crashes or reboots, not a state where it continues to run stable. Also it seems that the capacitor plague that used to effect PC motherboards, has caused quite a few...
  4. dave9

    DC powered devices

    Try some inrush current limiting, low ohm resistor of suitable wattage or thermistor in series. I would not use a (presumably lead acid) battery in a discharged state due to wear/cycle-life, would sooner drop 0.7V with a silicon diode in series before doing that.
  5. dave9

    Converting Double Insulated Light To Faux-Case Grounded

    Get myself into what problem areas I can't imagine? Seems like I'm imagining the problems already. The heat dissipation might be allowed for but only within the context of outliving the warranty period. Obviously that ~0.35mm sheet with non-vented, low surface area is insufficient for 12W...
  6. dave9

    What is recommended charger output voltage for a 3V rechargeable AA cell?

    How much charging current is available and how quickly does it "need" to be charged? The one thing in particular that you should not do is try to charge them based on voltage control alone. At a minimum you need a charge voltage above 1.45V per cell. Depending on the use pattern, if you have...
  7. dave9

    Converting Double Insulated Light To Faux-Case Grounded

    Someone gifted me an LED Work Light. Specifically a Utilitech Pro 12W # MPL1022-LED12K8040 https://www.lowes.com/pd/Utilitech-Pro-1000-Lumen-LED-Portable-Work-Light/1000260469 The casing is entirely plastic (+ glass front), no vent area and double insulated with only AC 110V live/neutral power...
  8. dave9

    LED stripe resistor

    Again you don't understand what PWM MEANS. PWM does not in itself mean anything about what the circuit does. You cannot write PWM and pretend it means more than it does. I'm not the slightest bit confused. PWM is switch mode, and controller is too vague to mean anything outside of the...
  9. dave9

    LED stripe resistor

    No what is adding confusion is when people try to take little bits of text and ignore the rest, or when someone writes only "PWM" but means something not inherent to being PWM. Adding the word "controller", is not the same thing as stating than an LED dimmer could be used. Proper terms are...
  10. dave9

    LED stripe resistor

    and you don't understand what you replied to in the first place. I wrote: If you mean a voltage regulated PWN controller, sure, but I specifically stated current regulated. Regardless if it still drives the strip with 12V, there is NO brightness reduction. If you mean a controller with...
  11. dave9

    LED stripe resistor

    "Can be" does not equate to meant to be which is what I wrote. You already have the losses from the series resistors due to it being set up for 12V supply. That may not be the worst thing in the world using a mains adapter, but it's a mismatch of tech that makes no sense unless stranded on a...
  12. dave9

    LED stripe resistor

    Now the other way to look at it... That link I gave above for 2835 LED based strips, is 3 LEDs in series. They claim 0.1W/LED but 2A for the whole strip which makes it look like it's running closer to 20mA per LED. A series of 3 LEDs, around 3.3Vf each, running off 12V with a 105 ohm...
  13. dave9

    LED stripe resistor

    Good grief, link the products! Having written that, those strips usually already have current limiting resistors built in, along with a series of 3 or more LEDs (depending on color), are designed to work off of 12.0V, are not meant to be used with a PWM current regulating controller. You...
  14. dave9

    Riddle

    What's really going to bake your noodle later is that Bill got that game at my garage sale for $2.
  15. dave9

    Looking for part

    The PCB is probably manufacturer specific and unavailable, but looks okay in the picture (?) so if the port itself is undamaged you can reuse it, or buy a new port, and solder it back on. I mean I am taking your question to mean, where to buy the entire populated I/O board. If you just need...
  16. dave9

    Solar charged battery with AC outlet

    We'd need specifics, what solar panels, charger circuit, batteries, inverter, load, etc. The specs for all of that. It's all money, but also all math, and a preliminary requirement is usually getting the solar panels in place then determining the average output vs worst case scenario and your...
  17. dave9

    Is a 3000 watt 12v to 120 inverter really just 2 1500 watt inverters ?

    I see a wheel there that you could turn by hand... otherwise I think I'd ask in a boating forum where there might be someone who has done what you're wanting to and can share their experiences with whatever they did, or see if you can buy one from someplace off their website but that has local...
  18. dave9

    Charging my power chair from a bench PSU?

    What kind of mechanical connection does the charger use? You could just make an extension cable that has the voltmeter/ammeter module on it, that can be swapped in, or not used, depending on whether you want to see the state of charge. However I would think that it would be nice to have the...
  19. dave9

    Need to replace capacitors in my Audio interface, a little advice please

    Yes the Panasonic FM series is very low ESR, not extremely low by today's standards but a cost effective part for the application.
  20. dave9

    Hello I'm Paul

    Absolutely, I know a guy named Paul and you're just like him. So how is Tina and did you get your boat fixed?
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