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  1. kellys_eye

    Pioneer DDJ SR - identify components

    Supply decoupling capacitor. Difficult to measure unless using dedicated metering device. Dead in what way? Shorted? Open? According to who? Anyone reporting a 'common' fault is likely to offer a reason as to why. Looks like corrosion to me - need a closer look to make a proper...
  2. kellys_eye

    I'm a newbie woodworker. My other hobby is quantum emergence.

    My other hobby is quantum emergence. Sure it's not 'fishing'?
  3. kellys_eye

    What incandescent lamp wattage to buy for PSU troubleshooting ?

    Some basic static test measurements would be the better testing method - checking for obvious shorts. A straightforward MCB with a low rating (say 2-5A) would cover for dead shorts you might have missed. There are some good tutorials on Youtube and documented for following a SMPS repair...
  4. kellys_eye

    Help me ID Component

    Probably the main switching regulator device IC375 (as well as potentially the bridge rectifier as mentioned by @H2184D above).
  5. kellys_eye

    Identify component L2

    Without seeing the bottom of the board we can't tell if all the pins are used. Measurement between 1 and 3 reads 0.5ohms? That looks about right. What about the other 'side' (the two pins on their own? - red 'smile') What do they read? Reading primary to secondary as OL is correct.
  6. kellys_eye

    Project feasibility - Police Speed Gun

    Not sure why you'd want to make something 'inferior' and with potential errors?? plus the attendant difficulties working with a device that wasn't intended for that purpose? Wouldn't it be more useful to try to improve on existing designs or maybe design something considerably cheaper that...
  7. kellys_eye

    What incandescent lamp wattage to buy for PSU troubleshooting ?

    What's wrong with ordering proper resistors and making a 'known' load?
  8. kellys_eye

    Cathode Ray Question - No Focus without deflection coils

    Older CRTs generally used electrostatic focussing via specific structural elements in the neck of the CRT. These required relatively high potentials too. Given the smaller size (space limitations( it seems appropriate to utilise external focussing which is only really a simple superimposition...
  9. kellys_eye

    SILICON CHIP LC METER PROBLEM

    OK, scratch the 'glass' bit!!! Can you still test for relay operation in regard to the correct relays operating properly for the required range? Did you use a pre-programmed arduino or load the code yourself? Did you use the right version of Arduino (official or chinese knock-off etc) and...
  10. kellys_eye

    SILICON CHIP LC METER PROBLEM

    Given the use of glass-encapsulated reed relays I'd suggest one or more has been damaged - easily done. Check that the right relays are operated (coil voltage measurements) and check for them sorting/opening as they should when the relevant relay is activated.
  11. kellys_eye

    Electrotechnique homework

    I'm not about to open a 'strange' zip file. Post the actual files (pdf, image, whatever) and we'll take it from there.
  12. kellys_eye

    Identify component L2

    Tested across which terminals? And the multi-function tester you have (assuming its the chinese component tester) wasn't designed to test such devices so won't tell you anything useful. If you look at the PCB where the coil was located you will see the two windings drawn on the board. Your...
  13. kellys_eye

    Identify component L2

    In what way is it showing 'faulty'? In these circumstances it is usually the controller IC (IC1) that has failed. It 'might' have taken out the primary of the transformer but that's a very, very rare occurence.
  14. kellys_eye

    Need Help with my PS5 controller! [DRIFT]

    Thanks for the update. Too few people bother to keep us updated and your feedback is appreciated.
  15. kellys_eye

    SILICON CHIP LC METER PROBLEM

    Don't Silicon Chip run a forum? Most big magazine writers do so perhaps check in with user comments there? Or perhaps post a schematic and we might spot something there.
  16. kellys_eye

    Ion Pathfinder 2 power wire colar

    Difficult to tell without a picture. Quite often the wires (if they are a pair) have a marking line on one of the cores that signifies positive - but sometimes it signifies negative! If there is a plug fitted (with a barrel connector) the outer part is usually negative, the inner part positive...
  17. kellys_eye

    Identify component L2

    Most microwaves that have 'digital' circuits (keypad operation, not the simpler rotating mechanical timer versions) have a defined supply for the electronics (5V) that frequently comes via a capacitor dropper/rectifier/regulator (sometime an SMPS) system. We would need to see the actual board...
  18. kellys_eye

    Will get pulsating DC on a transformer's secondary if I apply pulsating DC to it's primary?

    120 or 240V? Either way, the rectification results in a higher DC voltage than the rated primary. Pulsing the primary will result in an AC output - the voltage, as it increases, induces voltage in the secondary and then, as it collapses, induces voltage in the opposite direction (a...
  19. kellys_eye

    D Cell Rechargeable pack?

    You can get an 18650 (lithium) cell to d-cell converter here: https://www.ebay.com/itm/195678804084 Get a pack of 18650's and a fast charger and you're away...
  20. kellys_eye

    Unidentified tantalum capacitor

    Given the age, replacement is as good as 'essential' if you want to avoid further problems.
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