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  1. dave9

    I hate micro USB ports.

    Often, stamped out of same metal as the shell, there are two or more springy metal tabs you can bend inwards a bit but it is much easier to do with external access to the port rather than going in through the inside of it. If the inner plastic is deformed this may not make enough difference...
  2. dave9

    I hate micro USB ports.

    I hate them too, for all the same reasons. I'd even go as far as to state I'd rather have my phone be a couple mm thicker and even longer, to fit a larger port or a next generation redesign, new USB port standard that's more robust. USB-C isn't that, or at least not enough. I see it as a...
  3. dave9

    Little Electronics storage ideas

    I have some storage carts for larger items, similar to what's linked below but their past-generation model, was far cheaper than list price on sale at an office store at the time ($10 ea. in 2003 dollars). They come in various drawer heights and are modular, can mix and match different drawer...
  4. dave9

    Replacing NIMH batteries

    Yes you can do this unless it has a timed charge cycle, in which case it will not get the battery fully charged if you wait till it's running slow. If it instead just trickle charges over several hours, that will work fine. You can measure to determine which it is if the specs don't...
  5. dave9

    Electric motor cooling

    ^ Then it was undersized for the application or not rated for continuous duty.
  6. dave9

    Alarm clock in LED

    There's an echo in here!
  7. dave9

    I need some experienced peoples advice

    If you are getting rid of the high output alternator and extra batteries, where is the power going to come from? You absolutely need both to get any decent runtime from a 1000W, never mind 1000A, setup. I mean if the engine is off so you are sitting at 12V. If you only need short duration...
  8. dave9

    I need some experienced peoples advice

    ^ I'd guess this is a rigged car stereo amp, related question, where the 12V is rounded down from battery voltage, and 14.4V is the rated output from a driven alternator. Who knows if the 1000W is even an accurate amp rating if this is the situation. If it is the situation, the answer is that...
  9. dave9

    Fitting an fm antenna to my stereo radio

    Just get a whole antenna, F type male, wire or mast already attached. Examples: https://www.amazon.com/75-ohm-fm-antenna/s?k=75+ohm+fm+antenna If you have bad reception and need a roof mount antenna or extended outside, yes you could run coax to an antenna element but if a long run, will need...
  10. dave9

    Soldering temperature indicator

    ^ Yes, I'd think a laser would be necessary unless a very fancy one with a thermal gradients screen to see the component outlines.
  11. dave9

    Soldering temperature indicator

    I'd wonder if the laser will burn out if you keep it held down, so might maybe make a foot trigger switch so once aimed, you don't need another hand to operate it intermittently.
  12. dave9

    Soldering temperature indicator

    Only thing that occurs to me is pointing an IR temp gun at it for measurement, plus trial and error of surface temp vs underneath solder temp difference.
  13. dave9

    Help Identifying Component

    I briefly looked at Digikey and didn't see anything but with all the switches in the world it might help you to use a search like Digikey has and input the dimensions, note # of pins and spacing. Are there voltage and current ratings molded into it or even a manufacturer logo? If worst comes...
  14. dave9

    Using MIL-HDBK 217F to determine FAILURE RATE OF led

    ^ If not for being generic-Chinese, the bulbs would cost about what an entire new landscape light set cost. These generics, it was a wacky promotional deal, buy a 20 pack of something else, get these thrown in free, but instead of one ten pack free, I was sent 10 x 10 packs free (seller...
  15. dave9

    Using MIL-HDBK 217F to determine FAILURE RATE OF led

    Tell that to my landscape lights. The LED bulbs are rated for automotive use (so should be good up to 14-ish volts) but much about 12V their lifespan is only a few hundred hours due to having only 2 x series resistors to limit current. I ended up putting a buck regulator board in series.
  16. dave9

    Semiconductors and heat

    Remember heat gun is air so not quite as efficient a conduction to the chip, a more gradual rise where the moment of solder melting is more easily detected before temp rises much more, plus the chips are necessarily designed to survive manufacturing processes using an oven or wave soldering.
  17. dave9

    I would like to repair my fridge-freezer. But what's wrong?

    ^ If it's not very low yet it could take a while for ice buildup to be a show stopper. I wouldn't assume frost free means defrosting the evaporator with more modern designs attempting to eek out higher efficiency. Consider freezers that aren't frost free, don't need the coils manually...
  18. dave9

    Geneva model M power supply

    ^ Hold on it was just an example! The reviews suggest it's more like an overrated 1A supply which is all you theoretically need but for a dollar more I'd as soon get this one if not spending more time to find something major brand...
  19. dave9

    I would like to repair my fridge-freezer. But what's wrong?

    I wonder if it's just leaking, now low on refrigerant and thus freezing up to cause the shut down. I assume this "grill" you had to thaw out was the evaporator coils, while frost free generally just melts the frost off food, not needing to defrost that.
  20. dave9

    Geneva model M power supply

    States 24V, 1A and from the DC barrel connector diagram with +/- we can determine it's DC not AC. So, simply pick a mains voltage to 24VDC supply rated 1A or higher, that either comes with or that you attach the appropriate sized DC barrel plug on... looks kinda like a 5.5mm OD x 2.5mm ID (pin)...
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