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  1. kellys_eye

    4G/5G etc

    Thanks for that link - very informative. Some background explanation..... Locally we are poorly provided as far as an internet connection is concerned - 4Mb/s download at best (many are sub 2Mb/s) over a POTS connection using ADSL. The average for the rest of the country is now stated to be...
  2. kellys_eye

    4G/5G etc

    Not familiar with this technology so: Are all the cell masts (stations/transmitters etc) connected to a hi-speed internet connection to give them the capacity to distribute data? If not, how do they each manage to deliver such HSD as 'individual' cells?
  3. kellys_eye

    TV Antenna Signal Combiner/Splitter Question

    You can achieve what you suggest in either a 'generic' sense or a 'specific' sense - whilst the process of signal combination as described is valid, the efficiency of the solution can be marginal (to say the least) if using parts not specifically designed for the application. At TV reception...
  4. kellys_eye

    Replace power MOSFET in subwoofer plate amp, Sledge STA-1000D

    The 'goo' is a conformal coating used to keep moisture out, often slapped around circuits of high impedance that may be affected by environmental conditions. MOSFETs are usually driven into saturation and often have very low Rds(on) values (drain-source resistance in the order of milli-ohms...
  5. kellys_eye

    Can anyone identify connector Pin type from these picture (& some info)? (automotive related)

    Not familiar to me - sorry - but perhaps you could just source another cable/mirror (junk/broken etc) and swap some pins from it?
  6. kellys_eye

    HELLO i have a problem with fm receiver

    Plus we don't know for sure that you built it correctly (i.e. no mistakes).
  7. kellys_eye

    Taking Garmin Nuvi camping...

    Which Garmin Nuvi do you have? Google details of a replacement battery - they come in sizes depending on your model. You can then get details of the battery capacity. However long the current battery lasts you can do a simple mathematic calculation to see much longer a larger battery will...
  8. kellys_eye

    Distorted Channel on a Rockford Fosgate Amplifier

    Random(ish) testing on a comparative basis may not work in the manner you think it should - you really need to inject a signal and 'scope the signal path to find where distortion is being introduced.
  9. kellys_eye

    SKM53 GPS Datasheet

    All you need to know is where to apply power and where to extract the resultant signal(data). It IS all in the datasheet. Power - Vcc (pin 1) and GND (pin 2) using a 5V source. Signal out - TxD (pin 5) Signal in - RxD (pin 6) Reset device (at switch on or as appropriate) - RST (pin 4) You...
  10. kellys_eye

    Robust delay circuit?

    The brake lights/indicators can't be on for any length of time to be a significant contributor to 'wasted energy' can they? This is taking energy-saving to ridiculous levels! In a motor vehicle you would never be able to calculate the saving in terms of mpg.... a careless 'blip' of the...
  11. kellys_eye

    Robust delay circuit?

    If you aren't concerned for the loss of power (i.e. power saving is not an issue) then simply connect a suitable 'bleed' resistor across the LED to draw the 'difference current' between the LEDs consumption and that required to maintain the monitoring current flow. i.e. if the LED draws 200mA...
  12. kellys_eye

    Yamaha receiver won't turn on

    What do you mean by 'good contact'? What is your criteria for determining this? Did you actually check the contact resistance? Where is the cover for the relay? If it has been exposed for any length of time I'd be cleaning those contacts and/or replacing the relay. You can test at D822...
  13. kellys_eye

    Distorted Channel on a Rockford Fosgate Amplifier

    Those two 10μF capacitors at the top left look a little 'bulgy' to me. The good thing about stereo amplifiers is that they have IDENTICAL channels so you can compare signals/voltages from a good channel to find a fault in the bad channel.
  14. kellys_eye

    SKM53 GPS Datasheet

    No 'information' required. The device outputs an NMEA data signal at 9600 baud using NMEA propitiatory serial standard of 8N1. Your software would be configured as a serial receiving device and decode the relevant NMEA sentence according to your requirement and the sentence availability...
  15. kellys_eye

    Microcontroller replaceable?

    If the break was that small then the 'casual' inspection of a first-go look-see of broken kit is bound to miss it - but if it was a manufacturing fault then so-be-it, however if the break was as a result of (possible) corrosive effects then the other symptoms would be fairly visible and alert...
  16. kellys_eye

    Which motor is the right motor?

    The key to successful CNC-ing is rigidity. If you build a CNC machine WITHOUT rigidity you will live to regret it and end up repeating the process until you get it right. Best to start as you mean to go on and use the 'solid' parts - buy cheap, buy twice.
  17. kellys_eye

    Bell Carrol Plasma Cutter - Cut 40

    ...and derby like the hat....????
  18. kellys_eye

    Wiring LEDs to Corresponding Switches?

    supply + ---- switch(in) switch(out)---- LED(+) LED(-)---- supply 0V. <---- this is a series circuit. . . repeat the above for all the switches/LEDs you have . . connect all the supply + together and all the supply 0V together <---- this is the parallel circuit. Individual switches...
  19. kellys_eye

    Which motor is the right motor?

    Invariably you're looking at stepper motors which themselves come in NEMA standard i.e. 17, 23, 34 etc where the number indicates the size (in inches) across the body. The motors are also rated by torque, coil voltage/current, steps/rev etc etc. Most stepper motors are deliberately run over...
  20. kellys_eye

    Microcontroller replaceable?

    Congrats on finding the problem. But it leads me to suggest that you need to follow the basics of fault finding more closely in that 'sight and smell' are (perhaps) the first two techniques used. I always give any faulty equipment the #1 eyeball (with attendant 'sniffing') to spot areas of...
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