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  1. dave9

    Charging my power chair from a bench PSU?

    I would just get a ready made panel mount voltmeter/ammeter module on eBay, make an aluminum mounting bracket with a rectangular hole in it and put that wherever is most convenient (I don't know exactly what this power chair is), or put it in the charger housing if there's room for it, and...
  2. dave9

    Please Help replacing 2 power adapters with 1 battery or power bank.

    ^ Even then, there are ~ $1USD delivered buck switching regulator boards on eBay, barely larger than a LM7805 with a heatsink on it, could possibly be stuffed into the housing already being planned for the project. Examples...
  3. dave9

    Noob teaching self electronics. Needs help!

    Keep in mind that an ESR meter is probably a waste of time. When (remotely modern) TV capacitors get bad enough to cause that kind of behavior, they've usually vented already or are about to, won't look okay. What is the nature of the power cycling? At turn on does it practically immediately...
  4. dave9

    Help finding issue with this circuit.

    Often you would find both types in the same make and models of vehicle depending on whether it had manual (resistors) or automatic (transistor) climate control. Control of the transistor is handled by the console head unit. Head units can fail, but it is much less common. When that is the...
  5. dave9

    Broken Mini USB pin on Capture Card

    Yeah, I'm thoroughly disgusted by manufacturers using mini and micro USB fragile ports to save a few millimeters of space. You'd think the industry would have learned how bad that is from the decades that consumers have had issues with 3.5mm audio jacks, but we live in a throwaway society...
  6. dave9

    Please Help replacing 2 power adapters with 1 battery or power bank.

    Doesn't a PI use a small current, something like 200mA peak? I'd just throw an LM7805 regulator and capacitor between the 12V adapter and it. Put a modest heatsink on the regulator.
  7. dave9

    Help finding issue with this circuit.

    On those if nothing else looks bad, burnt/cracked/etc, it's the transistor. Make sure it is heatsunk well, better than from the factory if you want it to last longer for the 2nd tour of duty.
  8. dave9

    How to Figure out What Power Supply to Use (Battery Conversion)

    ^ Glue one of these on top to hide it: https://www.amazon.com/Window-Walker-Creepy-Coolest-Inexpensive/dp/B01LZXBPZW :p or paint it the same color as the wall.
  9. dave9

    Alternative Materials for Homemade Circuitboards

    What is this unusual shape and size? What exactly are you trying to make? What machinery do you feel that you need? I mean what is different about your needs than just buying standard PCB copper clad board and cutting it to size? A saw is not expensive, then you probably want to sand smooth...
  10. dave9

    using power tool batteries !

    ^ That's just it, we don't know if all the pieces are compatible. You can get a 12V computer fan that draws 100mA, or a radiator fan that draws 5A. The original incandescent overhead lights might be around 1A each, or LED replacements roughly 150mA at the same lumen output, times the # of...
  11. dave9

    Is it possible to replace a single speaker with an aux port?

    You can get ready to roll (wire) tuners and amp boards on eBay (direct from China) for cheap, single-digit $. They would easily fit in a 9x9x3 area. Trying to get the vintage case mechanical tuner dial and needle pointing to the number that corresponds to the actual tuner frequency, THAT would...
  12. dave9

    using power tool batteries !

    I can't understand what you mean. Main battery being meters away is not a problem. They make pieces of wire much longer than this ! :D No idea what Arouse meant by a path control. It's not a term I'd associate with any charger I've seen. What does "taking out og the power drill case to...
  13. dave9

    Is it possible to replace a single speaker with an aux port?

    Well vintage is about the look, some people value that and others think it's silly. There's nothing desirable about the electronics inside, you'd have to go further back in time to get a tube radio for the warmer sound, or more recent for lower distortion. It's kinda funny though, some songs I...
  14. dave9

    Is it possible to replace a single speaker with an aux port?

    Well then I don't understand. You might as well just use the case for the vintage appeal, put a HQ tuner and amp circuit in it if you were just going to use the low quality tuner and output that to an external amp. I mean that there's no real reason to have the radio signal go through its...
  15. dave9

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

    No they aren't just 2 x 1500W inverters, but it looks like that one rounds up. They spec 24.24A @ 110VAC which is 2668W, not even considering what both Alec adn Kelly mentioned, to pick one rated higher than the load. You should know how many amps your motor needs, not starting the other way...
  16. dave9

    using power tool batteries !

    Yes, simple run a wire from each charger contact to the respective battery contact, or easier still would probably be to run the wires from the charger contacts (open it and solder to the circuit board) out to the lights and fan. You would need to measure whether the charger drains the battery...
  17. dave9

    Speaker not working

    Probably blown voice coil in the speaker. You can measure for AC voltage on the leads going to it to confirm that or determine that the problem is upstream of the driver. When you buy a replacement, get two and replace the other speaker's driver too so they match. Otherwise the frequency...
  18. dave9

    Is it possible to replace a single speaker with an aux port?

    Be Specific. What is "different system"? What is "something else"? What exactly do you want to do? That determines how to do it. Being vintage, I would replace the speaker. If you would rather hack it up, then you can run a wire to an external speaker, or get rid of the volume knob to set...
  19. dave9

    Maximum battery charging using small generator idea

    It is really painful to just be clear and elaborate on exactly what you're trying to do? This topic makes no sense if it's application based instead of only theoretical, so a solution can be found in an efficient manner. You wrote efficiency initially but it seems that what you really meant...
  20. dave9

    Maximum battery charging using small generator idea

    The difference in fuel would be much more than that. The generator has variable fuel consumption based upon load. I don't see the exact model pictured on HF but a similar model claims 5 hours at 50% load and this with a 1.1 gallon tank. A mower/etc engine, would have the throttle set high...
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