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  1. kellys_eye

    Dual NR 5 DAB Radio. Leak on circuit/power board...

    Show the reverse of the board and tell us the make/model etc.
  2. kellys_eye

    Fishfinder L265 Datasheet (lost internal wires connection)

    Hmmm let me consult my crystal ball.........:rolleyes: If you happened to post a picture of the innards we might know some more..... Most equipment is built with polarized plugs and differing pinouts/pin count so you can't put the wrong plug in the wrong socket.
  3. kellys_eye

    Help Identify Component on Dynex TV Power Supply BA71G0F01043

    Personally I'd leave it alone and use the set until it fails completely. I mean.... it's 720p..... time for an upgrade!
  4. kellys_eye

    RLC series question

    Looks like it should have read 100Hz, not 'kHz' - what results do you get at 100Hz?
  5. kellys_eye

    Comparator - Battery Cutoff

    R6 is too high a value. The zener requires a minimum current to reach the zener voltage. 100k mean only 33μA flowing..... get it to the mA range.
  6. kellys_eye

    Layman's method for troubleshooting CD4016 analog switch IC help please

    In the absence of an oscilloscope, a true measurement of DC would be a better test as this will allow you to determine the switch 'on' resistance - some faults in such circuits may be caused by the switch not being 'perfect' rather than simply 'not working'. The LED-type tester is a go/no-go...
  7. kellys_eye

    Layman's method for troubleshooting CD4016 analog switch IC help please

    You can check it with DC voltages if you want - the switch passes AC or DC. Use a series current limiting resistor if injecting DC (1kΩ will do). Connect the resistor from pin 14 to the input pin of each switch and check for the same(ish) voltage coming out when the gate is 'activated'. Any...
  8. kellys_eye

    Electric motor needs start capacitor

    Capacitor between 3 and 4. Use a 5μF, 400V capacitor. Mains hot to 3 (or 4), mains neutral as stated above. If the motor runs the wrong direction, swap the mains hot from 3 to 4 (or vice versa). This assumes that the motor windings have been resistively proven to be from 3 to ground and 4 to...
  9. kellys_eye

    Layman's method for troubleshooting CD4016 analog switch IC help please

    Google the datasheet for the device. http://pdf1.alldatasheet.com/datasheet-pdf/view/11947/ONSEMI/CD4016.html Identify the power pins and check they are getting the right voltage (pins 7 and 14) Identify the inputs (pins 1, 4, 8 and 11) and outputs (pins 2, 3, 9, 10) of each 'switch' along...
  10. kellys_eye

    Car battery jumpstart gadgets

    A typical 10F super capacitor is only rated at 2.5V and a maximum current of 4.5A. You'd need a wacking great pile of them to make a boost start unit that can handle a 70A+ discharge and without using complicated charging/discharging arrangements. To get around 15V and just 70A you'd need a...
  11. kellys_eye

    Seperior massage chair problem

    ....and....? You don't even give us the correct name for the massage chair - 'Superior...' perhaps? Make and model number would be the basic minimum information we need to help you.
  12. kellys_eye

    Use AC speakers in Car

    Amplifiers that use a split rail supply (i.e. +ve, 0V, -ve) simply replicate an AC signal which is, after all, a signal that swings +ve and -ve about a zero point. Amplifiers that work on a single supply rail use a large capacitor to achieve the same effect.
  13. kellys_eye

    Battery charger questions

    It doesn't. Just because there are only two wires going to/from the battery doesn't mean there aren't multiple connections to the two wires from the point at which they may terminate (i.e. on a circuit board). This pdf http://www.ti.com/lit/an/snva557/snva557.pdf is very good at explaining the...
  14. kellys_eye

    Carpenters mistake

    More by good luck than any other process! If the blob wasn't made by 'you' it was made by someone else but not the factory manufacturing process. The blob is separated from being a total short circuit by virtue of some residual flux only, so if isn't properly cleared will cause a dead short at...
  15. kellys_eye

    How to use bluetooth mod with motor shield

    Given that comms to/from the BT module is simple serial protocol I would have thought that anyone familiar with the Arduino would figure that connection out quite readily. But thanks for sharing.
  16. kellys_eye

    Ceramic Heating Element

    There are battery-powered soldering irons - many versions in fact. But, AFAIU the vaping heaters require multi-amps from some high-density battery chemistry with the attendant risks involved - and therefore safety measures required. What you basically do is apply a dead-short across the...
  17. kellys_eye

    Car battery jumpstart gadgets

    The fact that a car requires 10's to 100's of amps to crank - albeit for only a few seconds - is the reason why a large transformer is required. To obtain the same 'oomph' using a smaller transformer you're (sort of) correct in that heavy duty capacitors are required. But the 'heavy duty' is...
  18. kellys_eye

    National Computer Electronic Flash Unit.

    You could try the Camera Workshop http://www.camerarepairworkshop.co.uk/ Post code MK2 2AZ If they can't, they probably know someone who can.
  19. kellys_eye

    Doubt about which fingerprint reader to choose

    The GT511 has demonstration software which should be enough to get you started: https://www.sparkfun.com/products/13007 (click on 'demo software')
  20. kellys_eye

    ECM - Jeep computer - help IDing the motherboard please.

    OEM - Original Equipment Manufacturer Unfortunately I don't know what an GA Tech EE Major is..... without information to the contrary we have to assume 'worst case' when answering questions. As stated, 'no insult intended' was meant to absolve me of blame....:p That 'steep learning curve' I...
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