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  1. B

    3v step down from 12v

    Already covered in #19.....:rolleyes:
  2. B

    Help To Determine Resistor To Dim Incandescent Light Bulbs

    You might also consider an adjustable buck converter.(around 3-4.00 dollars) Set output voltage to whatever brightness on the lamps and go from there. One shown will handle 3A. You said what the wattage of each lamp is BUT....not how MANY....:rolleyes:
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    Issues with a VFD

    You will need to supply a LOT more detail on the unit if you want any help. Things such as make, model any circuit diagrams, photos etc.
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    I want to know all of the maths concerning this scissor mechanism!

    Looks like something Gyro Gearloose might help you with......... either him or GoGo Gadget.
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    Power supply from USB wall adapter...some works...some doesn't

    Then supply the circuit diagrams of each and a photo of each side of each board.
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    Relacement for RIFA capacitor with 4 pins

    With the cap value shown . I'd say it is an RF interference cap and one could just chuck it and use the machine as is. Your diagram shows a motor with 4 wire connections which appears wrong to me unless it is armature (x2) and field coils (x2). No idea what the series bulb is for, my guess once...
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    3v step down from 12v

    In is obviously where the power goes in, so the higher supply voltage. Out is then obviously where the module puts out whatever is selected, in this instance 3v3 or 5v whatever solder bridge you decide to connect. Solder bridge required is on the back of the module pcb. ..............or adjust...
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    Relacement for RIFA capacitor with 4 pins

    Draw it out, pencil and paper will suffice and then take a photo and post here.
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    laptop sound issue

    Attempting to repair laptops is largely a waste of time.
  10. B

    Relacement for RIFA capacitor with 4 pins

    So......what happened to the circuit diagram requested...??? Your "+ and -" doesn't make sense being an X2 cap (I'm assuming on mains AC) No idea what the "bulb" is all about.
  11. B

    Relacement for RIFA capacitor with 4 pins

    Two should be ok. How was the original connected? Circuit diagram would help. X2 type is important as is the voltage.
  12. B

    Powering up mobile phone with no battery ?

    As already noted, the phone will be checking all four terminals for whatever. If absent, I doubt you'll get a peep out of it.
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    How to charge / discharge this battery ?

    I'd be surprised if there is actually a BMS on the cell. Most don't. However, the capacity is written right there on the label (4.44Wh) One can work it out by taking the mAh value (1200) divide by 1000 (so 1.2) then multiply by the cell voltage (3.7) which is a single cell. The Imax may show a...
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    Locking a 300V BLDC motor for encoder calibration

    If you get the resistance of the winding you can calculate the expected dc current that will flow (ohms law given it is DC) with whatever power source (voltage) you are injecting. Be aware your power source will not have infinite capacity and will definitely drop it's voltage level under load...
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    Locking a 300V BLDC motor for encoder calibration

    Induction calculations are unnecessary............use a basic multimeter as you are injecting dc. Measure the winding resistance and work out the value of current using ohms law. If it overrates the current ability of the winding, forget it. This IS brushless motor??...not stepper? Just at one...
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    Deep dive into Viewsonic VP230mb monitor, needing help

    Check a few youtube videos on the subject, they can be much more helpful than we can describe in a few words here.
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    Locking a 300V BLDC motor for encoder calibration

    Use ohms law to calculate the current. Brushless motors are essentially induction motors and as such rely on the inductive properties to limit the current. Pump in DC at whatever voltage and the resulting current could fry the windings. A 4s lipo can provide currents of varying amounts as shown...
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    Deep dive into Viewsonic VP230mb monitor, needing help

    Shine a torch across the black screen and see if conventional images can be seen. If so, look at backlight itself, whether LED or fluro type for bad connections to the tubes or dodgy driver board.
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    Component identification

    Let's see if you can understand this then........ In my reply........ First part .....capacitor.............0.1uF 10% 250v Second part....resistor........... resistor 1/4w 100R. and also again......... Don't be surprised if there is more to it than what you see there.
  20. B

    Component identification

    Appears to be 0.1uF 10% 250v ...resistor 1/4w 100R. Don't be surprised if there is more to it than what you see there.
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