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  1. dave9

    Power switch for commercial citrus juicer

    ^ You can probably do a google search for best juicer as well as I can, but if you post in a popular gardening forum asking, I bet they won't refer you to an electronics forum. ;)
  2. dave9

    DMM Showing Current without Current Source

    Absolute values are not really needed, just to make sure you don't toggle any of the circuits that cause it to come out of it's deepest sleep state for ~1 hour, then measure mV across all fuses (no need to remove them unless they don't have access at the top for meter probes which most do)...
  3. dave9

    DMM Showing Current without Current Source

    100mA is excessive once a vehicle enters its lowest power state but (that or even higher than 200mA) is to be expected in its higher power state before that times out... depends on the age/model vehicle. If your vehicle senses a hood switch or door latches (or disconnect/reconnect battery too)...
  4. dave9

    DMM Showing Current without Current Source

    In the manual, page 7 reads "Correction of Zero correction for DC measurement" "with no conductor inserted... press and hold the Z/F key (approx 3 seconds) until a beep sounds and the Zero symbol appears on the display" https://m.media-amazon.com/images/I/C1+4pwuzOSS.pdf Although the above...
  5. dave9

    Power switch for commercial citrus juicer

    ^ You'll probably receive a larger # of experienced user replies in a gardening forum than here. Otherwise, just generalizing, yes a heavy duty appliance that size tends to cost close to $200. I'm not that into the juicer scene to appreciate the physics but my initial impression would be that...
  6. dave9

    The mobile power bulges

    It may depend on your location but generally speaking, if you throw something away as bulk waste, it is not sorted through at all, unless the collector spots something that cannot be put in the landfill then it is left and not picked up at all. If you want to recycle it, make sure Google can...
  7. dave9

    Assistance required to find a short in a simple electronic board

    Determine which wire is used to energize the tail light, and then you trace the circuit, more of a pain since they decided to use a black pcb. Since there is an IC in the top right portion of the pic, I'd also get the markings off it and then the datasheet to see the pinout and functionality...
  8. dave9

    4.5v or 6v for a 5.6 battery

    A laptop is a bit of a different situation in that they don't ever trickle charge the battery at the end. Well it is "probably" a different situation, that your trimmer probably doesn't have much of a sophisticated charging circuit which is why it's depending on this oddball voltage power...
  9. dave9

    4.5v or 6v for a 5.6 battery

    A diode in series will get pretty close starting with 6V but I'd still want a series resistor and what but about what you wrote above, found it only takes what it needs, can you link to this info? Do you have access to the battery while it is charging, so you can determine the battery config...
  10. dave9

    How long will a 0.9ma nano motor unit last on a DCell?

    ^ Thanks, yeah I think I was half asleep when I wrote the below in a prior post.
  11. dave9

    How long will a 0.9ma nano motor unit last on a DCell?

    Yes it's possible, but I can't predict the lifespan at any particular duty cycle without some data. It's dirt cheap so I might buy a few of them if this is important to keep running a long time, then there is still the issue of how low a voltage it can use, which you may have to determine...
  12. dave9

    How long will a 0.9ma nano motor unit last on a DCell?

    It's been ages since I bought D-cells, but don't some of the major alkaline manufacturers put a date code on them like they do other sizes, so you're assured of how old they are? I want to say they rate for 10 years or something so subtract 10 from the best by date to know the manufacture...
  13. dave9

    How long will a 0.9ma nano motor unit last on a DCell?

    It would be very difficult to estimate this without more info such as whether your motor draws 0.7mA or 0.9mA, at what voltage it does that, what the minimum RPM is that is deemed acceptable to determine a termination voltage, what the current is at the reducing voltage as the battery drains...
  14. dave9

    The mobile power bulges

    As Harold mentioned, I was being sarcastic, but ironically, if more and more areas of the world start to ban sales of new ICE vehicles in favor of EVs, we will exhaust all land-based sources of lithium and have to extract it from the ocean. Frankly it wouldn't make much difference if you threw...
  15. dave9

    4.5v or 6v for a 5.6 battery

    What battery does it use? 5.6V is a strange voltage for 1 x Li-Ion or 3 x NiCd or NiMH and too low for 4 x NiCd/NiMH, so it looks like the charging depends on the very low 80mA current to end up trickle charging it, in which case you'd want the 6V but would want a series resistor (worst case...
  16. dave9

    Maytronics Power Supply not work. Help please.

    Can you determine how it powers on, perhaps it grounds the CTRL pin on the header pictured? One thing I would do is attempt to power it on (keeping in mind safety since you are then working with live mains voltage and even higher) and measure for whether there is both the 29V and/or 5V rails...
  17. dave9

    USB wiring

    There are variables involved that we don't know, but I would abandon this idea of adding an extra complexity and efficiency loss from a buck PSU module with its own waste heat, when the purpose was already delivering heat, considering your USB heater element is probably only worth $5 and USB A...
  18. dave9

    The New Model

    Yeah I think it has something to do with economy of manufacturing scale, that I can get electrical boxes much cheaper than electronics project boxes, sometimes the electronics project boxes even cost more than an equivalent enclosure housing a ready-made product . Sometimes you can get the...
  19. dave9

    TRIMMING AN AVI FILE. THE FILE SIZE EXPLODES

    If all you want to do is crop out a segment and re-encode to your choice of codec, you don't have to pay for software to do something this simple, freeware alternatives exist like avidemux, though it can do a fair bit more than just that, and personally if that's all I were doing with a video...
  20. dave9

    LED/LED Flashlight Beam and Field Angles?

    I don't understand your question. A 50% figure comes from measuring MCD in the beam pattern relative to the hot spot center of the beam. How are you going to calculate anything? The beam pattern is a spec based on the reflector or optics put in front of the LED or from the LED manufacturer...
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