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  1. dave9

    Computer power supply question

    ^ I was thinking something less expensive but still major brand like this: https://www.ebay.com/itm/264846916612
  2. dave9

    Computer power supply question

    ^ Or just get a mains voltage to 24VDC adapter and do without the computer PSU instead of a second regulated stage which probably drops efficiency and adds bulk.
  3. dave9

    Thermolysis coax cords keep breaking, how to fix?

    The first thing to try is heating the probe holder and evacuating the solder out of it, whether by solder wick, solder sucker, or gently grasping with pliers and vigorously shaking or tapping it upside down against a hard surface. I don't know exactly how these RF hair removers work, am...
  4. dave9

    Interface connector help

    ^ Or put mounting studs into the 3D printed design to screw on from the inside, or a slot or tabs to hold it, depending on the socket design... then wouldn't even necessarily have to be a panel mount type socket.
  5. dave9

    There is a problem with the subwoofer amplifier circuit made by TDA2005

    This could be a circuit layout issue, are you using a star ground to ensure that return current from the speakers isn't polluting the input signal?
  6. dave9

    Lead-acid charger

    The voltage on an unregulated design like that will drop to the battery voltage plus a small amount over it. The battery electrolyte shouldn't appreciably boil away until the battery is fully charged and there's nowhere else for the extra power to go besides electrolysis of the water. That is...
  7. dave9

    Charging a phone from solar directly?

    It depends on the amount of time the output drooped below whatever threshold the phone considers too low for fast charging. You'd have to measure and calculate from that, but if the duration is long enough to notice then it will need a lot of capacitance. It would probably be easier, and...
  8. dave9

    outdoor (Aqua) weather power points contain moisture, dirt and rusted screws

    Don't understand the question, OF COURSE a unit meant to be sealed from weather, is going to have a shorter service life if it is not. Whatever these pips are, if you can't get or make some equivalent, then you could seal it with sensor safe (non acid cure) silicone after cleaning out dirt...
  9. dave9

    VOLTAGE REDUCTION TO OPTIMISE STEP DOWN TRANSFORMER

    While I can appreciate wanting to keep something stock, I think I'd have as soon swapped the existing transformer.
  10. dave9

    Question capacitor

    Another one of those "make it last forever because I never use it", topics. At this point you're just trolling: https://www.electronicspoint.com/forums/threads/electrolytic-capacitor-doubts.295396/#post-1816504
  11. dave9

    PWM Controller Guidance

    Topic is from 2014, and the only post by this member... james211 has probably moved on by now.
  12. dave9

    Potentiometer Guidance

    There's some fairly strange info in the above posts. Practically all computer fans made in the last 25+ years are brushless. I mean "PC" fans not industrial rack who-knows-whats special applications. There are lots of two wire brushless fans, and regardless of whether two, three, or even four...
  13. dave9

    Switch Identification

    ^ If the setup is a direct (switched) supply from the AC mains, to a mains AC voltage level bulb (you should be able to find the bulb spec in the owners manual or perhaps on the bulb itself), then you can use a multimeter to determine which wall outlet plug contact corresponds to each of the...
  14. dave9

    Light/outlet remote status indication

    I'd just get some smart outlets and a Google Home mini then tell it "hey goople, turn the workshop lights off", or tell it to turn them off at X PM time every night.
  15. dave9

    Transformer wiring

    You cannot connect together any way around, because the phase will be reversed if hooked up backwards so they would cancel each other out. See if you can find the datasheet for it, or look at which direction each lead is wound around the core. If one winding lead is going clockwise around the...
  16. dave9

    What is this Diode Contraption ?

    We may need more detail about what you're trying to do. Why is less space on the PCB important? It could be that this is just an old design and that's why it was laid out around the individual diodes, or could be they were cheaper and yet in that case, they still spent more to put heatsinks...
  17. dave9

    Advice on replacement power supply for Geemarc phone?

    It doesn't need to be the same make and model for the router, just a 12VDC, 2A (or higher) PSU, ideally with the same plug so you don't have to swap the plug on that one too. It uses the standard config of negative barrel and positive center, plug...
  18. dave9

    Advice on replacement power supply for Geemarc phone?

    You didn't tell us where you are located, to buy online without a long wait shipping who knows where. I took at guess at a UK location and searched amazon uk but didn't find any non-switchers in the brief search I did, so maybe some electronics repair place or a used goods thrift store might...
  19. dave9

    Advice on replacement power supply for Geemarc phone?

    You could crack open the original PSU to see if you can find/fix a fault in it, or observe the circuit to see if it has a unique design or added filtration, or possibly it is just a lower switching frequency. Your universal PSU might just be an unregulated linear type (despite being labeled...
  20. dave9

    Roland xp60 key board

    I have no experience with those but imagine the general procedure is going to be opening it up, seeing if there is any fluid that was spilled in, check whether the switch that each faulty key activates is working (continuity or resistance multimeter measurement), or if this group shares some...
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