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  1. kellys_eye

    Main-in/pre-out difficulties

    It would help if you supplied links to the individual items of equipment you're referencing as we aren't all familiar with the hi-fi industry and individual pieces of equipment therein. Most 'line out' signals are taken BEFORE any controls (tone, volume, balance etc) and this is the 'correct'...
  2. kellys_eye

    How to Trigger (on and off) the Battery Wirelessly ?

    Yes you do - otherwise it won't work. But modern systems use ultra-low standby currents which can often be less than the leakage current you find in batteries that power the devices! In other words the receiver will use less power than the batteries would use even if they weren't connected/used.
  3. kellys_eye

    I want to program microcontrollers. Tell me what to do next.

    The $64,000 question :D Some would argue that quantum computers would be the future (and I'd tend to agree) but technology changes so rapidly these days it isn't easy to anticipate what the markets may be interested in in a couple of years, never mind the 'near future' (which I'd call 5-10...
  4. kellys_eye

    LED light: 120V and 25watts vs 12Volts and 25 watts: whats the difference?

    Agreed. The issue is ENERGY, not 'volts' or 'amps' but energy (as measured in watts) is the product of the volts and the amps.
  5. kellys_eye

    Measuring battery voltage with an MCU while charging and discharging

    What's wrong with using the MCU (via an ADC port) to measure the battery voltage directly? Equally you can fit a sense resistor and measure the charge current. Using the data from the battery manufacturer you can find out the ideal charge/discharge rates for the system and monitor and/or...
  6. kellys_eye

    How to Trigger (on and off) the Battery Wirelessly ?

    Wireless doorbell perhaps?
  7. kellys_eye

    Multiplex IC 5 inputs and 5 outputs custom?

    Make a list of the pins that have an actual 'change of state' and a list of the signals that will be used on them. It may well be simpler to design a discrete component (gates, transistors etc) circuit to do the 'switching'. It doesn't sound much different to the way this used to be done for...
  8. kellys_eye

    Multiplex IC 5 inputs and 5 outputs custom?

    How many actual different combinations of connection will there be?
  9. kellys_eye

    Home circuit fault feeding back into speakers?

    The only other possibility is a defective RCD (trip) - it does happen.... More 'complicated' faults relate to "borrowed neutrals" but that would have to be investigated by a qualified electrician. Wiring per se doesn't not 'randomly' introduce such faults. Do you have any storage heating on...
  10. kellys_eye

    Home circuit fault feeding back into speakers?

    It won't be the mains wiring that messed with your speakers. Most probable is that your fridge is the cause of random tripping. including the fridge? Most people can't do this due to the sensitive contents! And the washing machine.... if it has an internal water heater (most do) then this...
  11. kellys_eye

    Retrofitting a vintage radio for blue-tooth playback. Power problems.

    The bluetooth module will work from 5V plus or minus 5% so it's unlikely the transformer supply will be able to give such an accurately regulated output for that module - hence the smoke..... Using a 6V battery would allow you to use a simple silicon diode as a series 'dropper' (it will reduce...
  12. kellys_eye

    Automatically opening door

    How large is 'very'? The product caters for dogs up to 45kg and the video on this page shows the comparative size of the doors (showing the largest) which, TBH, even I could crawl through (6ft 2in, 250lbs)! https://store.intl.petsafe.net/en-gb/smartdoor-electronic-pet-door
  13. kellys_eye

    What is KCL, KVL?

    Get a book such as Horowitz's 'The Art of Electronics'. Open it at page 1. Read page 1. Turn to page 2 - increment until you reach the last page. Other than using Google (or any other search engine) you can find details of these basic principles in many, many 'beginners' books on...
  14. kellys_eye

    Multiplex IC 5 inputs and 5 outputs custom?

    If it's an analog switch it will accept 'any' input between the limits defined by the datasheet - if you allocate a logic level for TX/RX or simply 'pass through' (what you put in, you get out - possibly with a very small % loss) a DC voltage (where 0V is 'ground') then you have every signal...
  15. kellys_eye

    how to glow led at 24V

    Check out our 'Resources' Section where all is explained: https://www.electronicspoint.com/resources/got-a-question-about-driving-leds.5/
  16. kellys_eye

    Multiplex IC 5 inputs and 5 outputs custom?

    That's what a cross point switch does.....
  17. kellys_eye

    What is KCL, KVL?

    Don't they allow access to Google where you are? You could use a different search engine of course..... but here's the basic's https://www.electronics-tutorials.ws/dccircuits/dcp_4.html
  18. kellys_eye

    Automatically opening door

    Such pet access hatches already exist. We had our cats microchipped to stop a stray following them indoors and the chip is sensed by the hatch and unlatches it for access. The hatch is fully programmable for direction (in/out), time(s) and day/night - they even do one for dogs...
  19. kellys_eye

    Retrofitting a vintage radio for blue-tooth playback. Power problems.

    What power sources? Specifics?
  20. kellys_eye

    Multiplex IC 5 inputs and 5 outputs custom?

    What you're describing is a "cross-point switch" - digital and analog versions are available but probably in sizes larger than you actually want i.e. 8x8. It would be possible to build one using discreet gates or even a FPGA but since this method of switching has been around for 'ages' you may...
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