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  1. kellys_eye

    sansui au 717 smoke

    Something burned - burning tends to cause smoke...... With the 'blatantly obvious' out of the way the answer would be 'how would we know'? Post some pics of the innards. It could be a PSU problem or it could be (more likely) a failure of the output stage. If you want assistance in fixing...
  2. kellys_eye

    Microwave Inverter PCB (F6645BA01GP) - Shorted Bridge Rectifier

    Discounting a random failure (always possible though) then failure of the switching controller may have caused a short long enough to destroy the bridge yet see the IGBT survive. This is based on your test stating that the IGBT is ok.....
  3. kellys_eye

    Need help troubleshooting a pure sine wave battery backup inverter system

    Those batteries look suspiciously like lead acid (sealed lead acid perhaps?) If they are then they've been over-discharged and are probably dud. The issues surrounding difficult/lengthy recharge also point to the fact.
  4. kellys_eye

    Sturdy DC power jack

    Check out the DC connectors used on CCTV cameras https://www.onbuy.com/gb/kenable-55-x-21mm-dc-power-plug-to-socket-cctv-extension-cable-5m-white~c11672~p21943483/
  5. kellys_eye

    240VDc supply

    The OP could be referring to a conventional pi-style DC filter (C-L-C) with the L sometimes replaced with R as per 'usual' tube receiver circuits. Such circuits are very forgiving for ripple and the C part is commonly as low as 32uF, the receiver current usually being of the order of 10's...
  6. kellys_eye

    I need help in identifying this part

    Whatever it is it won't have blown without a good reason and that reason usually means a lot more is going to be wrong than just that blown part. What was it you did to cause it to blow in the first place?
  7. kellys_eye

    Would like to know which wire to snip.... if I can even do that

    Unless you are familiar with electrics and the risks involved (potentially fatal to you and/or others if you get it wrong - and 'wrong' means using tape to secure a joint) then purchase a lead with an inline switch. We can't sanction modifications by 'unskilled' persons as your post seems to...
  8. kellys_eye

    240VDc supply

    Rule of thumb is 1000uF per amp so 2000uF is overkill. You'd likely get away with 470uF (without knowing exactly what it is you're powering, this is a guess though).
  9. kellys_eye

    Short pulse output

    Only in a sim - it will NOT work in the world we live in.
  10. kellys_eye

    The LM317 Adjustable Voltage Power Supply kit

    Depends on the current consumption though..... even at 1A consumption that's only 7 watts and the heatsink shown with the kit should manage that for a short (long) enough time.
  11. kellys_eye

    loudness question

    ...and mathematics presumably?
  12. kellys_eye

    Building DIY double-conversion UPS - How to handle battery charging?

    Yep, my bad. Regardless of the PSU used to run the inverter, the battery will only take what it needs. Just coz the charger is rated at 40A doesn't mean it constantly outputs 40A. Think of it in the same way your car alternator (150A) charges the battery and runs the car electrics - it's not...
  13. kellys_eye

    Whirlpool Side by Side American style Fridge Freezer too hot and too cold

    It'll be a severe disappointment if you get to change all parts except the main controller IC!!! Edd's analysis is always very thorough but there's little that actually goes wrong with those things and, frankly, I'm astonished that the capacitors were all out of range. One, maybe two - but...
  14. kellys_eye

    Sourcing LED Board Replacement

    Looks like the innards of (practically) any domestic LED light bulb.... Buy a 7W lamp and tear the plastic top off it and see what I mean.
  15. kellys_eye

    diagnostic port on smartkegger control board.

    You both said a 'lot' and 'nothing' at the same time - but we're getting used to it..... Re-read my post above (#17). A temperature controller costs $10 and would 'fix' your kegger in half an hour...
  16. kellys_eye

    Building DIY double-conversion UPS - How to handle battery charging?

    Wrong thinking. The charger should only be used to charge the battery, NOT to power the UPS (which it won't be able to do so anyway of the power is out....). The usual method is to have a charge rate of around 10C (i.e. 1/10th the capacity of the battery) - they sometimes use different 'C'...
  17. kellys_eye

    Modified sinewave to pretty good sinewave?

    Not so sure that theory will stick for too much longer! Given the supply chain issues and economic consequences I reckon 'repairs' will start making a comeback.
  18. kellys_eye

    Whirlpool Side by Side American style Fridge Freezer too hot and too cold

    I'd change all the relays. They've been switching inductive loads all their lives and will likely have pitted contacts meaning intermittent outputs. The relays all look to be pretty much standard issue so should be easily available. Given they rarely cost more than a few $ each it won't be...
  19. kellys_eye

    Short pulse output

    I have no disregard for microcontrollers and their abilities (vast and capable) but it's not as simple as 'a few lines of code' since (1) you need the programmer and (2) you need the coding experience and the ICE/development software. Of course, any modern designer would leap for the uC...
  20. kellys_eye

    Short pulse output

    I get the impression that the difference between 1.99 seconds and 2.01 seconds would be irrelevant. Using a sledgehammer to crack a nut isn't always the right way.
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