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  1. dave9

    Rhino air hockey

    You'd measure the output from the adapter with a multimeter as a start. While I wouldn't recommend powering the display with a 6VDC 300mA adapter normally, if the plug is the right size (and right polarity) I might plug it in just long enough to see if the display lights up and starts working...
  2. dave9

    Resistors for IR LED's not working?

    Is it possible you have the LED's anode (positive) and cathode (negative) reversed?
  3. dave9

    Resistors for IR LED's not working?

    ^ That is normal, you need a load (LEDs) attached for it to drop voltage. Hook it all back up and measure across one of the LED's positive and negative to see if you're getting a voltage drop around 1.6V, and put the meter in series (anywhere) to measure current, like between USB 5V and the...
  4. dave9

    Remote control circuit of old TV?

    It seems like a futile effort to make a remote control for a TV that old. They haven't been made in Japan for many years and it's a wonder that it still works. Certainly it has a short life left. Regardless, I would buy a universal remote control that comes with a lot of codes and try each...
  5. dave9

    Need help with fine soldering to make low profile right angle USB C plug

    The picture doesn't give me any idea of what it looked like before trying to solder it. A couple things I would do are, have the plug, plugged into a mating socket, both to provide a minor amount of heatsinking of the pins, and to hold them in place if the plastic starts to melt. I'd use much...
  6. dave9

    Reducing music in videos

    I doubt any analog solution is going to be enough. You could do a band pass filter with the assumption that human voice is mid-range but music typically has a lot of components in that range too, and certain males and females are at the opposite extremes of that range, and there's bound to be...
  7. dave9

    Hello,, can someone identify components in a Gallagher M4000 ?

    Shaped like resistors, have you measured for resistance? Has this board failed, why are you focusing on them?
  8. dave9

    Where can I find these components other than china?? FETS and DC-DC IC's etc.

    What evidence did you have that the ECU is causing the misfires? Is this vehicle common in Australia so you could just pull an entire ECU out of one from similar if not same model year and engine at a junk yard? Get it close enough and you won't need to swap the PROM.
  9. dave9

    Yamaha R-8 receiver drops memory at power off

    I found a topic that suggests they used a (albeit old school low capacity by today's standards) supercapacitor for memory, located "buried near the edge of the vertical circuit board, where it meets the adjacent horizontal circuit board. Look for it on the horizontal CB, near the edge." Part...
  10. dave9

    LM317 Help

    If the power supply is low enough ripple, just throw a silicon diode in series with it to drop ~ 0.7V
  11. dave9

    14.4 V Lithium battery - re-purposing question

    You should open the battery and assess whether it has charge and discharge termination protection, or carefully monitor a charge and discharge cycle to determine it, keeping in mind what WHONOES wrote. If it doesn't I'd move on and pick something that does or just make a normal bench power...
  12. dave9

    Battery Fail and Pop?

    No, the most I've seen a primary or NiMH cell do is once when I had one on a charger that was faulty, it grossly overcharged and made a tiny pop-hiss sound as it vented. I'd never have noticed if it weren't sitting 2 feet away. I am wondering if what you observed is just coincidence, that you...
  13. dave9

    12v 5A to 12v 10A

    It would be easier to just stab yourself in the eye with a fork if you're really this much of a masochist.:p You're inflating tires. This is something your grandfather nailed decades ago.
  14. dave9

    Schematic diagram for DT-9205B Digital Multimeter

    It might not be worth fixing. DT-9205 costs about $9USD with world-wide free shipping on eBay, etc.
  15. dave9

    Programmable Smilies

    Some of them don't even know how to read an analog clock. There is hope for the future in that eventually, none will know how to operate a firearm except using a game controller or mouse, so no more school shootings.
  16. dave9

    12v 5A to 12v 10A

    Based on OP's other topic this is presumably to power a 10A (peak) air pump/compressor, most probably just a brushed DC motor design. A higher current bench supply might come in handy over the long term but for this application something much less expensive could be used. For example...
  17. dave9

    10A device to 5A supply?!

    It depends on what your bench power supply does when the current is exceeded. If the bench supply shuts off then the pump will stop. If the bench supply drops voltage the pump will slow down. It is probable that the peak current is starting the pump motor so it may not start at all or start...
  18. dave9

    Programmable Smilies

    One thing I definitely Do Not Want is more animated things on a webpage. Senseless waste of compute cycles, slower page load and higher data rate, distracting, and sometimes annoying.
  19. dave9

    model s50FH - YB01 Samsung crackling noise

    Take the cover off and look for the noise source. Might be arching on a broken solder joint? I have no direct experience working on plasma TVs. I'd be inclined to replace it with an LED TV. The prices for 1080p sets have really dropped over the past few years and they use less power so...
  20. dave9

    Technics SA-CH550 panel very dim, is it fatal

    If there's nothing there, all the spiders will get in. :p
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