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  1. kellys_eye

    Build a variable power supply

    Why those input voltages? Presumably those DC 'source' voltages will come from some sort of AC-derived supply in the first place so why not just use an AC source to get the variable DC output(s) you need anyway? A simple ex-laptop adapter with a buck/boost circuit would do everything you need...
  2. kellys_eye

    DC motor hookup for reuse ( recycle)

    You can get basic 3-phase motor controllers from the usual far East suppliers that will cope with that type of motor.
  3. kellys_eye

    Comparable Component

    Many manufacturers use in-house coding for their parts and some of the numbers you reference will relate to batch numbers, manufacturing dates or 'whatever' the manufacturer deemed useful for their own use. What part numbers are on the four 'similar' devices attached to the large heatsink at...
  4. kellys_eye

    Energy Monitor Killed Using Wrong Charger

    It would help if manufacturers got together to keep the designs common and avoiding conflict such that all 5V adapters had only ONE size plug (i.e. they MUST be mini-USB) etc but there's a lot to be said for the 'conspiracy theory' that they design them so people CAN make errors as it only...
  5. kellys_eye

    Energy Monitor Killed Using Wrong Charger

    Measuring a voltage won't indicate an internal fault in the main IC. If it's 'blown' then a lot of the pins that drive displays and take in voltages/signals just won't be doing what they're meant to do.
  6. kellys_eye

    Gas Gauge Sending Unit question

    It could be as simple as the arm carrying the float is slightly bent.
  7. kellys_eye

    Temperature Sensor for a pressure cooker.

    The heating element will probably be wired in series with that temperature sensor (normally closed contact) such that an event exceeding the temperature of the sensor will break the power to it. It's likely fitted as a preventative measure against boiling the pan dry. The cooker temperature...
  8. kellys_eye

    Networks Of Multivibrators

    Anne Summers? Love Honey?
  9. kellys_eye

    Turning Motor Shaft indicator, or motor Stall warning!!!

    KISS principle!
  10. kellys_eye

    Energy Monitor Killed Using Wrong Charger

    The provision of an external 5V power supply usually means there is no onboard regulation and the main circuitry is powered directly - which probably means it's goosed*. * polite word for FUBAR'd
  11. kellys_eye

    Unsure what cable this is?

    Is really unhelpful - it's a 4k monitor for anyone wanting to reply. Looks to me like an T-CON-to-LDVS cable/connectors. This will be specific to the device/manufacturer and a difficult item to source.
  12. kellys_eye

    Temperature Sensor for a pressure cooker.

    Given the type of equipment and potential for catastrophe I suggest you seek the manufacturers recommended replacement at whatever cost that may incur.
  13. kellys_eye

    Can You Identify This?

    Randomly removing and testing parts is a long-winded way to a fault. What symptoms do you see and do you have any technical (schematics) information on the device?
  14. kellys_eye

    Home Based Income as an Electronics Hobbyist

    I wasn't even aware that this forum is 'England/Scottish' based! I knew it was created by a Brit but it has a global feel to it given that a lot of posters are overseas (from my perspective). But the location of the site is irrelevant in respect to electronics as a hobby or as a whole. With...
  15. kellys_eye

    Turning Motor Shaft indicator, or motor Stall warning!!!

    Something even simpler. A flat (thin) plate connected to the moving arm of a microswitch and placed in the air stream perhaps?
  16. kellys_eye

    Can You Identify This?

    Yup, 10uF 15V 'time bomb'. Tantalums are notorious for problem causing.........
  17. kellys_eye

    Pcb power supply diagnose

    Battery issues are very common in this type of device - despite measuring 12V you have to load the battery to determine if it's holding a charge and if the device has been left 'trickle charging' for extended periods of time it is quite possible that the battery is defective. When you got the...
  18. kellys_eye

    Pcb power supply diagnose

    The PSU will have a rating plate on it indicating its output voltage and current - can we see that please? Obvious the first check would be to test that it is outputting that voltage and that it can maintain that voltage under load. If it can then the PSU is ok (of course). Have you tried...
  19. kellys_eye

    Pcb power supply diagnose

    Are you comfortable working with dangerous high voltages? If so you can measure the AC input, DC after the filter capacitor and DC at the output. There are probably components on the reverse side of that board too - can we see a pic of the reverse side?
  20. kellys_eye

    Multimeter DIY test leads gauge

    The gauge would be most affected when measuring current but since this requires you to break into the wire carrying the current you'd be 'right beside it' anyway so a set of longer leads wouldn't be necessary. As for voltage, this will be affected but only over distances much greater than you...
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