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  1. (*steve*)

    Electronics newbie , blown subwoofer board?

    Those resistors look fine. Sure they seem to operate fairly hot, and this has discoloured the board, but it may be fine. When you say "staticky sounding", do you mean: The speaker make a sound which is always present, in addition to what should be made? The speaker makes a sound which is only...
  2. (*steve*)

    What determines compatibility in Android phones...

    It gets shocking reviews. Even the 5 star reviews make it sound bad. Oh except for the guy who reckoned it was maybe 500 megapixels!
  3. (*steve*)

    Cable tracer for RG6,RG6Q

    Place a signal on the cable and see which cable it is at the other end. Can you disconnect all the cables?
  4. (*steve*)

    Tiny power supply: buy or make my own?

    Have you seen mains powered USB chargers built into power points? The ones I've seen are tiny and should provide the power you require.
  5. (*steve*)

    DVR power supply testing

    It doesn't look like that resistor has gotten hot in service, and eventually failed. I suspect it failed all of a sudden due to a massive overload. I would be checking for semiconductors that have failed short circuit. If this resistor happens to be a gate resistor for a mosfet, then I would...
  6. (*steve*)

    ESP8266 regulator with 220v

    3.7V plugpacks are available. I think they were for some old phone. 3.7V may be within spec for some 3.3V devices, but I'd probably regulate 5V to 3.3V because 5V is far easier to find (also it allows you to use higher voltage plugpacks without causing much trouble.
  7. (*steve*)

    Robotic pitch liner (white line marker)

    Look at the NEO-M8P devices. One of these in a fixed location can provide correction to the other unit allowing "centimeter accurate" positioning. Accuracy comes at a cost. That cost is either/both money and (in)convenience.
  8. (*steve*)

    Small low-power light sensor

    I'd use a circuit like this: This has minimal current drain when the LED is off, and I'd use an ultra-bright LED at a low current (say 1mA). The IC could either be a 40106 (which will operate at 3V) or 74HC14 (which should operate down to 2V) or similar. Note that these chips have 6 schmitt...
  9. (*steve*)

    DVR power supply testing

    In the first photo above, it looks like something has leaked over the board near where the white wire connects to it. It may be simpler (and quicker) to find replacement caps for all the electrolytics, and just change them all. It's relatively cheap and if it doesn't change anything you know...
  10. (*steve*)

    Amplifier substitute PAM8403 class D amplifier

    You were given exactly what you asked for. That part uses the PAM8403. Connect it up exactly the same way.
  11. (*steve*)

    What?! Being put on the sidelines is a good thing?

    Listening to an internet "radio station" and hearing their never ending advertising for their premium (ad-free) product... I think I am correctly quoting it, "Let Tune In put you on the sidelines of every game of NFL football." Where I am, being "put on the sidelines" means to be ejected from...
  12. (*steve*)

    Can you extend the leads on a fluorescent ballast (blown ballast?)

    No.
  13. (*steve*)

    Hi, center tap transformer, how to calculate?

    Because all the rest of us are trusting @Audioguru to assist you.
  14. (*steve*)

    Trying to fix dead dishwasher. AEG F35020VI

    As you've found out, resistors don't burn out all by themselves. What you've done is similar to replacing a fuse only to have it blow again. What you'll need to look for is the cause of the problem. It may be a failed semiconductor, a short, or some other failed component. The first trick is...
  15. (*steve*)

    RF detector

    I was under the impression that there are amateur licences these days that don't require too much technical knowledge. I have heard some complain that the requirement is simply enough money to purchase equipment. As a "not an amateur radio licence holder", my first thought was a sniffer coil...
  16. (*steve*)

    Substituting a transistor for a MOSFET in a flyback driver

    With no load on the feedback coil the risk is that the voltage would rise high enough to destroy the gate of the mosfet. Another risk is that it may not rise high enough to turn the mosfet completely on (it is most likely design to deliver current to switch a bjt rather than voltage to switch...
  17. (*steve*)

    Agh! What's that thing called? Two pins - measured time by cummulative current.

    And now we know why appliances fail 1 day out of warranty! :-)
  18. (*steve*)

    Solid State Musical Organ just hissing....

    You have been here long enough to know not to post multiple threads.
  19. (*steve*)

    simple resistance calculation exercise

    yep, and so on...
  20. (*steve*)

    Agh! What's that thing called? Two pins - measured time by cummulative current.

    I remember something many years ago that apparently transferred silver (?) From one electrode to the other. When it was all transferred across there was some significant change in electrical characteristics. I think I was a young lad at the time, so don't blame me if I have almost everything...
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