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  1. dave9

    PWM LED DImmer

    The driver has at least 4V drop (difference between minimum input and output) and LED has up to 14.0V forward drop, so adding them you need at least a 18V PSU. To ensure long life from the PSU and ease keeping it cool running, you want significant overhead for current. Since 1A is a common...
  2. dave9

    Crt tv power problem

    Your questions suggest to me that you should not be mucking around inside a CRT TV. It is unlikely the problem is just the cord unless it looks like it got ran over by a vacuum cleaner and is frayed. More likely the owner deliberately damaged the cord so nobody would try to power it up!
  3. dave9

    Humidifier power button bypass

    Keep something in mind. All you really need to do is put a piece of tape over the humidity sensor, when the humidity is low of course. :D If the sensor has cracks/gaps/seams in the casing then you might need to seal those too with tape/epoxy/wax/hot glue/bubblegum/etc.
  4. dave9

    Humidifier power button bypass

    You need one of those robots with live streaming video and remote control arm movements over the internet (RCAMIPWTFBBQ) so I can disassemble and probe it remotely. Kidding aside, we can probably figure this out if your pictures were more intuitive, for example a picture of the unit then...
  5. dave9

    Humidifier power button bypass

    Like any switch you'd just jumper wire around it. Measure power to the motor or piezo component, whatever is driving the moisture, and compare to the portion of the circuit where that power is produced and jumper around the detection subcircuit.
  6. dave9

    Humidifier power button bypass

    Heh, I wrote compressor because I somehow read humidifier but thought dehumidifier. If you link to the product it might help, but might be a matter of just putting jumper wire between power input and the motor. Include a switch on the wire if you'd like to turn that feature off.
  7. dave9

    Humidifier power button bypass

    Your pictures were inadequate to determine how the circuit is set up so the answer is setting it to a lower humidity level than it would reach. However the generic answer is bypass the sensing subcircuit so the compressor/fan/etc always gets power.
  8. dave9

    AF-Q120VX Sharp A/C error code H3

    If the compressor doesn't sound funky when it's turned on, I'd guess you have a leak that lost the refrigerant. If it sounds funky, I'd check the motor start/run capacitor(s) to see if any have failed.
  9. dave9

    Bluetooth Doorbell

    You don't need a light for 15 seconds. Just rig the doorbell switch up to a relay that switches on a Ridiculously F U BRIGHT Light for even a fraction of a second. If you need audible too, hook it up in parallel with a fog horn. However you wrote knock. No. Put a doorbell there. If someone...
  10. dave9

    Switching to the direct source

    What if you just flap the phone in front of you really fast to make a breeze? ;)
  11. dave9

    What might this be?

    It's bacon. They are cooking bacon on their roof and that is a good thing. :D
  12. dave9

    Heatsink Mosfet

    I need drawings and pictures or something more than described. Generally no you can't just put a fet in a silicone tube and assume it will heatsink okay. The minimal thickness is very important.
  13. dave9

    Car radio static

    ^ I suspect petrol because it's usually related somehow to the ignition system, that putting it in drive changes the engine RPM just enough to be a problem. Has it always been like this or has it gotten worse? If it has gotten worse I would suspect dried up capacitors in the radio or the...
  14. dave9

    What connector type is this on aerobic septic system control board?

    Frankly I would just desolder that connector and put one on that you can find the mate for. They're around 25 cents each for the more common/simple designs. This can't be high current so primarily you just need to worry about maximum allowable pin size (the size of the hole in the PCB) and pin...
  15. dave9

    Drone propellor not spinning. motor fine. no voltage

    That one is now cheaper ($25) on Amazon: https://www.amazon.com/Goolsky-Waterproof-Headless-Rolling-Quadcopter/dp/B01JROH8JA?tag=dronerush-20 Most waterproof drones are in a much, much higher price class, but there is this $80 Goolsky Q353: https://www.amazon.com/dp/B06XT2Y732/ref=dp_prsubs_1...
  16. dave9

    Running house LED lights on AC

    ^ You can even go a step further and pop the diffuser dome off the bulb. In most cases it seems to block at least 25% of the light, and the bulb would run cooler as a result, but then it is very ugly to look at, particularly without a shade, and in many cases would expose high(ish) voltage...
  17. dave9

    Drone propellor not spinning. motor fine. no voltage

    If you don't have a hot air station to desolder it, you might try using a dremel (rotary) tool with a cutoff wheel to gently sever the body of the transistor then you can desolder one leg at a time. That doesn't look like it would be hard to solder a new transistor in if you have a small iron...
  18. dave9

    Running house LED lights on AC

    You can buy top-side covers for recessed lighting, install and seal the perimeter with a fire-proof sealant. They will run hotter as a result, and here in the US (as far as I know) it is required that these lighting units have a thermal cutoff switch so with that cover making them run hotter...
  19. dave9

    Drone propellor not spinning. motor fine. no voltage

    See if power is making it to the 00A8C transistor just to the left of the motor black wire. This might be the datasheet for it (equivalent): https://www.vishay.com/docs/65701/si2300ds.pdf
  20. dave9

    Laptop lid sensor...

    I thought there was a little plastic pin (switch plunger) sticking up through the bezel along the bottom edge of the screen and it just pushed that in?
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