Search results

  1. dave9

    When replacing battery in a pack

    The pack will either have all the protection on a separate PCB in it, or a portion and the rest is in the tool itself. You do not need and should not use protected cells nor try to add your own PCB for that. Reuse the one already in the battery and/or tool. You should buy major brand cells...
  2. dave9

    12 volts deep cycle battery

    It might help if you described the project you intend for this battery. If the load is resistive then it will draw more current at higher, fully charged battery voltage and less as the battery voltage drops while it discharges. If the load has a regulated power circuit in or between it and...
  3. dave9

    BOSE Solo 10 Help - No Power Up - Pics + PCB Part List

    ^ The PCB should have a letter/number designating the burnt component. The first letter of that is a strong hint what it is. I can't see the pic very clearly but first guess would be a (c)apacitor or (d)iode. Based on your description of "no output across the other two terminals", assuming...
  4. dave9

    Landscape Lighting

    All I did was a google search for 18V 2A transformer and up popped several hits. I mean literally transformer, not an entire integrated PSU. I would not run a switching PSU like used on laptops, outdoors because of the temperature variations unless you live in a very mild climate. You need...
  5. dave9

    Landscape Lighting

    I don't understand the issue. Bare 18V, 2A transformers are easy to find, as are switchmode PSU with adjustable output that can be set to 18V.
  6. dave9

    Light bulbs as dummy load for Stereo ?

    Keep in mind, that you can get a 50W to 100W resistor in the single-digit ohm value you want, for about $1 delivered on eBay. Examples - https://www.ebay.com/sch/i.html?_from=R40&_nkw=50W+resistor&_sacat=0&_sop=15
  7. dave9

    Two unrelated questions

    ^ Is 2mm a problem? It should still be optically good enough for most purposes and if the edge is a little exposed it can be rounded and polished down to a transparent state. Regardless I see a couple polycarbonate on ebay 1mm or thinner and there may be more...
  8. dave9

    Two unrelated questions

    The front plate is often acrylic, though I suspect this is mostly due to optical clarity, cost and ease to mold it, but that shouldn't stop you from using some other material if you need to, for example polycarbonate if you need impact resistance, but then watch out for UV yellowing if it will...
  9. dave9

    point me in the right direction

    What is the budget you anticipate? I'd expect someone to want several thousand dollars deposit to even begin development unless it's more about integrating an existing product into a helmet, which you can probably DIY. The simplest solution is probably adapting a traditional automotive backup...
  10. dave9

    finding 4 pin connectors for own wires

    ebay will probably be the cheapest, delivered, price if you can wait a month to receive them. Search for terms like 4 pin wire connector. Throw in the word sealed or waterproof if you need that. If you instead want the highest quality or to receive them sooner, pick a major brand, look on the...
  11. dave9

    Sensors to detect and locate a fire

    ^ Okay, just a misunderstanding on my part.
  12. dave9

    Sensors to detect and locate a fire

    ^ Not sure if you meant to quote me or are just intoxicated. Wanting a robotic fireman and being able to achieve it are two different things separated by a gulf of massive engineering, testing, and liability, to suppose it is sufficient for the purpose which it is probably not. It's not a...
  13. dave9

    Sensors to detect and locate a fire

    There is no way you can easily do this. First you'd need to detect smoke, but need programming to understand the direction the smoke drifts, and not have a simple way to determine if the fire was extinguished. Since the smoke will still persist, and drift, and the fire may have potentially...
  14. dave9

    24 Volt DC Transformer to AC mod ?

    It may depend on the application. For example the most common use I can think of for a 24VAC/1A transformer is a doorbell circuit and if the voltage isn't quite right, your doorbell light (if present) could be far dimmer than intended, or less likely, over-voltage and burn out prematurely. As...
  15. dave9

    powering a cordless drill with PSU in drill press DIY build

    ^ A drill press is a different beast than typical hand held drill work. You need either a heavy base or to have it bolted down, and the work piece often needs to be in a vice, and it is much easier to put substantial strain on the drivetrain or with a weaker drivetrain like you'd see on a...
  16. dave9

    powering a cordless drill with PSU in drill press DIY build

    Frankly, this is madness. Even if you achieve your goal, it won't be remotely as powerful, durable, easy to use, or safe as a real drill press. Under heavy loads, your drill will stall and burn out the motor, but yes 500W for a 24V drill should be enough, but if it's old enough that you can't...
  17. dave9

    Is there a 12VDC power regulator / timer?

    That will not make much difference. You have to leave the cell phone running so it is always consuming the same amount of power either way. That is the amount of power that has to be put back into it from the vehicle battery. If your charging circuit is always live but the phone is fully...
  18. dave9

    Two power sources...

    It only needs 30mA @ 12VDC, call it 40mA if rounding up after a diode voltage drop. SRD-12VDC-SL-C Datasheet: https://www.rlocman.ru/i/File/2018/02/21/SRD--T73-.pdf The very common and inexpensive 1N4001 would be fine.
  19. dave9

    IC-socket corrosion removal

    It could depend on the extent of the corrosion. Are these nickel plated? If so the plating may be gone and even if you get the socket perfectly cleaned off, it will corrode again. In other cases you might be able to spray deoxit on, then insert and remove the chip several times to abrade away...
  20. dave9

    Repair Headphone Wire Ripped from PCB

    Yes you could solder the wires together without the potentiometer in series on the cable, and may eventually have to do that if the pot gets bad contact since it is cheap and weak/low-lifespan. However for what you have there, it looks like only two wires are disconnected, is this correct? If...
View older results
Top