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  1. kellys_eye

    Too good to believe...?

    Other than changing the PIC for a 'proper' processor, what difference is that from any modern DSO?
  2. kellys_eye

    Too good to believe...?

    Much to be said for that too. For all the stuff I've ordered direct from China I've yet to be let down or disappointed. Ok, a couple of errors but they were all corrected when pointed out. I only wish I had the wherewithal to order the vast quantities of stuff that pique my interest!
  3. kellys_eye

    Whirlpool washer CCU AAWCB-003 schematic needed

    Built-in obsolescence is a fact. Manufacturers simply cannot afford to build equipment that 'lasts' else they go out of business!
  4. kellys_eye

    Running house LED lights on AC

    The UK wiring system has the lighting on a separate circuit (6A) and also separates the upper and lower floors such that if the lower floor RCD trips the lower floor LIGHTS don't go out (they are powered via the upper floor RCD). It has to be a pretty efficient (and safer) way of doing things!
  5. kellys_eye

    Too good to believe...?

    Agree entirely - but given the way the atmosphere is changing it may be wise to stock up while you can.......
  6. kellys_eye

    Whirlpool washer CCU AAWCB-003 schematic needed

    Good spot @dave9... But going back to my post.... if you really want to make any consumer item more reliable (and have the skill set of course) then simple changes to known 'cheapness' is a good way to do it. It's often possible to re-work 'cheap' goods to be very much more reliable but when...
  7. kellys_eye

    Too good to believe...?

    https://www.banggood.com/DSO-NANO-PRO-Handheld-Oscilloscope-2_4-Inch-IPS-Screen-30MHz-Bandwidth-200M-Sampling-Rate-p-1332155.html?utm_design=39&utm_source=emarsys&utm_medium=Mail_mid160_email&utm_campaign=newsletter%E2%80%94emarsys&utm_content=leander&sc_src=email_3146655&sc_eh=c782c2d7f556aade1&...
  8. kellys_eye

    Whirlpool washer CCU AAWCB-003 schematic needed

    A schematic isn't going to help fix bad connections or poorly snubbed relay contacts - you can address them with the relevant parts and good engineering practise. Changing the relays for better quality versions is usually a good fix for any such machine these days. If you wanted to be 'anal'...
  9. kellys_eye

    Amp temperature imbalance

    Yes. A push-pull output stage would normally have 0V at the 'centre point' and it may be that the shorted part is causing the output stage to try to compensate for the 'pulling' of the supply to the other rail. Change the dud transistor.
  10. kellys_eye

    I want to make DC-DC voltage booster

    Most internet 'farms' have their own generators (just as the phone company has their own battery backup supplies). Lots of modern technology uses low voltage (12V being a base line figure) and it is easily possible to configure a home to default to a 12V source if the mains supply drops out. A...
  11. kellys_eye

    Running house LED lights on AC

    There's no such thing as 100% efficient - other than bank profiteering - so the 'energy saving' side of LED lighting is all about comparisons. Losing 68W is better than losing 268W if you used filament lamps (so they say). The lighting circuit of any household is (usually) totally independent...
  12. kellys_eye

    Tri-Quad digital battery pack monitor

    The device you show in: https://www.ebay.com/itm/122117143903 looks to have THREE wires (red, black and white) for the input (3rd and 5th picture where the displays show 120V) - perhaps a separate display power input (max 32V) and the white wire as the measurement input??? Either way, I've...
  13. kellys_eye

    Powered Sub

    The speaker is rated at 15w RMS and has an impedance of 6Ω. It appears to be a passive device and requires an amplifier rated to match.
  14. kellys_eye

    Amp temperature imbalance

    You may have a shorted transistor on the 'hot' heat sink side. Check the Vbe (voltage between base and emitter) of all the transistors on the hot side and see if there are any well outside the 0.6V(ish) range.
  15. kellys_eye

    Panasonic SA-BTT775 Home theatre wont turn on just clicks

    We see/hear of many examples like yours and they inevitably point to internal problems that require test equipment and tools to repair. Unless you have a decent test meter and soldering equipment you may find it easier to seek professional repair services and/or purchase a new unit (which is...
  16. kellys_eye

    What is this part?!

    The actual value won't be critical. Rewinding it is one option and matching the wire/turns will give the right answer. If you're 'getting into' electronics and repairs then you might look at collecting old, dud, equipment and PSU's. Those inductors are very common in many modern PSU's and a...
  17. kellys_eye

    Where can I find Ferric Chloride Hexahydrate in the USA?

    FeCl3 is heavily used in water treatment plants and should be easily available. The major electronics suppliers will have it anyway (RS, Farnell etc) and as far as I'm aware it's not a 'controlled substance' so should be easily obtained. https://uk.rs-online.com/web/p/processing-chemicals/0551277/
  18. kellys_eye

    Speeding up and re-using Ferric Chloride etchant tips:

    If I wanted to be PC-orientated I'd tell you off for using chemicals without the appropriate protective clothing etc :p but I've been-there and done-that with yellow/brown fingers over the years myself! My preferred method is to use really hot water when making up fresh FeCl and etch...
  19. kellys_eye

    Circular?

    I'm trying (not yet succeeded :cool: ) on settling on a PCB design software package rather than using multiple versions for individual tasks. As such I'm not certain whether Diptrace (which I haven't a copy of .... yet) does everything I feel may be required of my design work. I'd like to use...
  20. kellys_eye

    Amp temperature imbalance

    Unless all the transistors are 'matched' then you WILL see different voltages across the emitter resistors - that's what they're there for! Similarly, because the transistors are NOT matched the heat dissipation will vary. If you want a 'balanced' heat distribution then you would have to match...
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