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  1. kellys_eye

    24V 15A plunger switch wanted

    Wrong attitude. Relays have reliability in the 100's thousands of operations. If you can find a plunger rated at that current (they do exists - not cheap) then go ahead but any designer would use the relay route rather than rely on a heavy duty switch if they can. Additionally you will find a...
  2. kellys_eye

    24V 15A plunger switch wanted

    Don't bother. Use a lower current rated switch to activate a relay carrying the heavy load current. i.e simple plunger button activating a car accessory relay.
  3. kellys_eye

    How do you store your test leads?

    Mine are neatly looped and stacked in a box, ready to be pulled out in a tangle of knots and cursing.
  4. kellys_eye

    Automatic transmission component

    Sounds reasonable to me - speedometer drive signal perhaps?
  5. kellys_eye

    Trying to repair ps4

    It might actually be a 'dead short' - manufacturers often use 'zero ohm' resistors as opposed to wire links when populating boards.
  6. kellys_eye

    Please help me in identifying the IC

    Show more of the board and/or give us some context as to it's situation/use.
  7. kellys_eye

    Automatic transmission component

    ISTR seeing some two-pin devices surrounding a laser printer motor - might be my bad memory/eyesight though!
  8. kellys_eye

    Automatic transmission component

    Looks like a single wire with a trace colour to me...... however, if it is two wires then it's very likely a hall effect sensor and potentially a 'neutral detect' device. It's easily tested using a magnet. The workshop manual should have a wiring diagram that reveals all.
  9. kellys_eye

    Automatic transmission component

    If it only has one wire going into it then it's 'nothing' i.e. a simple plastic cover for an unused wire. Is there anything 'exposed' that resembles a contact of any kind? We can only side the 'side' of the part.
  10. kellys_eye

    Help identify power components

    Please use either current limiting or place an inline fuse in the 12V rails - 2A fuses will suffice. FAilure to do so could result in massive damage if there is a short elsewhere in the circuit.
  11. kellys_eye

    Help identify power components

    No, he didn't get it wrong - you misread his post and missed the bit where he stated the common connection would be ground.... to the OP - yes, with two 12V batteries connected as described the common point is the ground and the two 12V posts remaining will be + and - 12V.
  12. kellys_eye

    Help identify power components

    At a push (probably quite easy), get a couple of 8-cell battery holders (AA type) and make two 12V battery packs. Joint the positive of one to the negative of the other. This becomes the 'ground' (common). The remaining red and black wires will be +12 and -12V respectively. It will work long...
  13. kellys_eye

    Help identify power components

    They can be known as 'split rail power supply' - 'dual output power supply' - etc but here's one I found on eBay https://www.ebay.co.uk/itm/255398545845?hash=item3b76f089b5:g:x-kAAOSwoJxhykcG which would work.
  14. kellys_eye

    Problem with CRT TV brightness

    Possibly (and probably) a heat related issue and dry joints in the soldering around the line output transformer and/or smoothing capacitors in the associated circuitry.
  15. kellys_eye

    Help identify power components

    A +/-12V power supply is (or, rather, can be) easy to construct although the cost may be a put-off. When you see what mass-production can deliver it makes you wonder why 'we' build stuff too! Anyway, using a 12-0-12 secondary transformer, rectification, smoothing and 7812/7912 (+12V and -12V...
  16. kellys_eye

    Help identify power components

    It generates TWO 12V supplies - one positive 12V (referenced to ground) and one negative 12V (referenced to ground) - the 'ground' is the PGND terminal. You can get encapsulated power supplies that deliver +/-12V quite readily - fit one upside down and take wires from the inputs/outputs to the...
  17. kellys_eye

    NiMH battery pack mystery

    Got two 6 cell holders? Try two in series and see what you get. Occams Razor - the 8 cell holder....
  18. kellys_eye

    NiMH battery pack mystery

    If the current flow changes (drops) between using the 6 cell pack and 8 cell pack then the 8 pack cell has a faulty cell in it. You can only produce 10A from a 7.2V source if that source has a sufficiently low internal resistance to permit that level of current.
  19. kellys_eye

    NiMH battery pack mystery

    Yes, what happened - TO THE RESISTOR? Measure the volt drop across the resistor while measuring the current flow.
  20. kellys_eye

    NiMH battery pack mystery

    Imagine a series chain of resistors. The current flow is a function of the sum of the series resistances. Current flow can only increase if one (or more) of those series resistances is lowered but will always be a function of the HIGHEST resistance even if all the other resistances drop to...
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