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  1. kellys_eye

    Basic: Trying to hookup 20v Decker lithium battery - to a 20V four wire Hoover vacuum. Same parent company.

    Whatever..... sometimes you have to experiment to get the result you want!
  2. kellys_eye

    I need a Maker

    Unless you can make one using parts from mobile phones then this is a problem that will take a LOT of skill and (potentially) expense. 2mm thick? To include the mic/speaker? Not even sure a mobile phone speaker on it's own is that small??? (a speaker can be used as a microphone too so you...
  3. kellys_eye

    High voltage 12 volts applied to 5 volt Nixie clock - damage? Can it be fixed? ?

    Hope you love your daughter more than the nixie clock! It's very unlikely a simple repair could be done. The logic circuitry is 5V +/- 10% so a 100% (and more) application of the supply would 'blow' a lot of the chips. Do you have a schematic or reference we can view/download. At a stretch...
  4. kellys_eye

    Basic: Trying to hookup 20v Decker lithium battery - to a 20V four wire Hoover vacuum. Same parent company.

    You could do worse than try it yourself. I'm not familiar with the batteries you refer to so can't really comment but it could be that the tx/rx designation is a deliberate ruse to make potential hackers think twice when, in actuality, the wiring might only NEED a resistor to 'prove' the...
  5. kellys_eye

    Power supply for a tethered drone

    Whatever - your problem still remains .... the cabling from the power supply to the drone. Assuming you use cables capable of taking that kind of current they'll be so heavy your drone won't be able to move. The reason the drones are FITTED with high (instantaneous current) batteries is that...
  6. kellys_eye

    Basic: Trying to hookup 20v Decker lithium battery - to a 20V four wire Hoover vacuum. Same parent company.

    The yellow and white wires coming from the PCB at points marked 'tx' and 'rx' point to some form of communication between the battery and the main device such that unless you emulate or simulate that signal the device isn't going to acknowledge its presence therefore never power up. Maybe you...
  7. kellys_eye

    Synchro motors for wind direction indicator

    Yup, quoting myself here! I took the punt myself and bought that synchro direction indicator. Works perfectly and will be used as an indicator of a rotating loop antenna I plan to install.
  8. kellys_eye

    setting off a reed switch with a coreless coil

    Choose your reed switch from the list - check out the value shown as 'pull in sensitivity' (with a value stated as 'AT'). The AT refers to 'ampere-turns' i.e. the number of amps compared to the number of turns in your coil. The larger the number of turns the lower the amps, so wind it...
  9. kellys_eye

    Battery Charging in Inverter

    Your schematic doesn't show any part of a charging circuit. It only shows triac switching of power to an attached load - that load is assumed to be the charger itself??
  10. kellys_eye

    setting off a reed switch with a coreless coil

    Too many variables. Distance, coil size, wire size/turns etc. Download this file and have a good look - it's very explanatory and detailed: https://docs.rs-online.com/3da7/0900766b8155cf0c.pdf
  11. kellys_eye

    8 and 6 ohm speakers

    Putting resistors in is a futile exercise as the audio power will simply be dissipated in the resistor rather than at the speaker. Note also that speakers are measured in 'impedance', not specifically a 'resistance'.
  12. kellys_eye

    HELLO I HAVE 360 CCTV CAMERA BULB NEED HELP

    10 ohm 0.5W not that it will make any difference......
  13. kellys_eye

    battery pack question

    No they didn't. One battery will inevitably fail before the rest - the odds on them all failing at the same time are incredibly remote and when ONE fails it causes the remaining cells to be placed under stress and liable to more failures ad infinitum.
  14. kellys_eye

    battery pack question

    As it does for every single type of battery in existence.
  15. kellys_eye

    PWM issues when powering 4X 4pin 12v fan

    Looks as if the PWM generator has an open-collector output hence the use of a pull-up resistor. The sellers information on the PWM device isn't specific on it's actual output hence my query about checking whether the -ve supply rail connects direct to the -ve PWM output. That it isn't...
  16. kellys_eye

    Power supply for a tethered drone

    Firstly it's unbranded, secondly it's Chinese! Thirdly, where would you expect to plug that thing in? Do you have an electrical outlet that can deliver 6kW? In most homes this would be a connection for a kitchen range/cooker or a dedicated supply line run directly from the main consumer unit...
  17. kellys_eye

    Figured I'd say hi

    I recall Venomballistics form the old DF days but can't recall your handle there? I was 'in to' DF until it suffered the problems you describe and I've not been back there in years. Is it even still up? Anyway, this forum has some very knowledgeable and friendly users too and is a nice place...
  18. kellys_eye

    PWM issues when powering 4X 4pin 12v fan

    Your schematic shows you using a BLUE wire for the PWM signal - if this is what you're doing then it's wrong as the PWM is supposed to attach to the YELLOW wire. The blue wire is a signal OUT of the fans for monitoring purposes.
  19. kellys_eye

    Power supply for a tethered drone

    14AWG?? For the power cable? At 200A??? Those cables would look like incandescent light bulb filaments if you tried that! You need to be aware of the volt drop caused by cable resistance at those currents. 200A at ~18V (average) means a supply rated at 3.6kW - not something you'd find...
  20. kellys_eye

    extra 10 volts why

    I'm sure the OP has the kit to measure the 0.001V difference.........
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