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  1. kellys_eye

    Identify this diode.

    In a power supply circuit?
  2. kellys_eye

    Solderable paint?

    Despite its age the only solderable paint I know of would be the silver-based conductive paint some suppliers sell.
  3. kellys_eye

    Can anyone identify this component for me please.

    There's no point in 'following voltages' if you don't know what those voltages are supposed to be. What is it that makes you think the fluctuating voltage is causing a shut down? How do you know it's not meant to fluctuate? And what does 'fluctuate' mean - in this context - anyway? The...
  4. kellys_eye

    Identify this diode.

    Schottky diodes have a lower Vf than standard silicon devices (0.2V rather than 0.6V) so should show on a diode test meter assuming the diode is actually working.
  5. kellys_eye

    Can anyone identify this component for me please.

    With all due respect (prelude to me saying something you're not going to like to hear....lol) "Probing around" seems to be your go-to fault-finding method which, as experience will eventually teach, hardly ever leads to anything useful least of all valuable knowledge on 'what you're doing and...
  6. kellys_eye

    Value of this capacitor

    I've heard that expression too. Depends on how old you are I suppose - could also be a cultural thing.
  7. kellys_eye

    Can anyone identify this component for me please.

    No you haven't - you've found a DESIGNATION of 'BC801' - the component itself is unmarked. As much as it looks like a resistor it could be a small inductor given the 'short' reading. Since that board has components on the other side we would need to see them (and the related position of BC801...
  8. kellys_eye

    Sallen Key Low Pass Filter, bandpass filter

    There's 'bugger all' to the basic design of the filter section that couldn't be actually, physically constructed (on protoboard or hardwired) with sockets for the relevant resistor/capacitor values and you could play to your hearts content until you found something that worked. How about...
  9. kellys_eye

    Identify this diode.

    by what means (short, open)? How did you test it and what did you use to do the test?
  10. kellys_eye

    Value of this capacitor

    Pelican capacitors. Old manufacture. I recall using them in the 1970's...... 1.5uF and 250V as above. Well known for losing their end wires. Polyester in construction and modern components are smaller (physically) plus have more robust wire terminations. Replace 1 for 1...
  11. kellys_eye

    Barking activated device/alarm??? DESPERATE!

    So, basically, an income and/or ego-creating solution to you? If they offer an income then spend some of it on kennels for them. TBH if you can't control your dogs then you shouldn't even own them.
  12. kellys_eye

    Sallen Key Low Pass Filter, bandpass filter

    Got any part of this built and working yet? 700+ posts in this thread............
  13. kellys_eye

    component identification

    Looks to me - according to your 'schematic' - that the diode is simply there for reverse polarity protection therefore is a 'simple diode' and not a zener. Have you tested it and what made you remove it (symptom)?
  14. kellys_eye

    Capacitor explodes on PSU

    Nope, me neither! This is where another pic with the appropriate annotations on it would make a big difference. I also find it confusing to have to scroll back 'pages' to reference the 'small board' so please try to keep the posts relevant by including the information we need instead of us...
  15. kellys_eye

    component identification

    What does that mean? Can you show the circuit it came from? We need some context.
  16. kellys_eye

    Converting Bluetooth headphone to hearing aid.

    3+ year old thread. Please start a new one if you have any questions.
  17. kellys_eye

    Flash Memory Question

    Yes, electrically erasable: https://4donline.ihs.com/images/VipMasterIC/IC/SIST/SISTS00472/SISTS00472-1.pdf?hkey=52A5661711E402568146F3353EA87419
  18. kellys_eye

    Help required on Atmega 2560-16AU programming.

    Have you tried reloading the blink program?
  19. kellys_eye

    Capacitor explodes on PSU

    Pictures of areas of the board YOU think have issues may not show problems elsewhere that you might have missed. Equally, close-ups of individual components don't give the viewer any context to consider what that component may be and how it interacts with parts associated (around) with it...
  20. kellys_eye

    Capacitor explodes on PSU

    There are plenty of online reference articles that explain the workings of SMPS devices and some that offer advice on repairing them. Your current knowledge is lacking and your pictures/descriptions don't help either. From FIRST PRINCIPLES - the power comes in via a fuse and filter(s) to a...
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