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  1. (*steve*)

    Best place to buy used electronics?

    When you say dual quadrant, I presume you mean that the supply can also act as a load if the output of the power supply is connected to another power source, i.e. when the voltage is positive but the current is negative. If so, you could look on eBay or elsewhere for some of the old HP or...
  2. (*steve*)

    Kamoden HM-350 transistor Tester

    There best way to communicate is to use a private message to pass on an email address. That's far better than posting it publicly.
  3. (*steve*)

    Is this a screen issue or another issue?

    I presume the question you're asking is "will a new screen fix this?" The problem may be "the screen", but external to what you buy when you get a replacement screen. I would guess that the problem is in the controller stuff for the screen. Some of this controller stuff is integrated with...
  4. (*steve*)

    Need Help Identifying SMD component (gone missing) on Samsung Tablet

    Get some mylar tape to mask off components you aren't working on. It will help prevent other components desoldering themselves while you work on their neighbours.
  5. (*steve*)

    lighting a 7 segment LED

    Generally speaking, threads are not closed unless there is some reason to do so. We have had people come back to their original thread after several years (not often, but it happens)
  6. (*steve*)

    Using a radial cap instead of an axial one - shielding needed?

    You will need to be careful if there is anything under the caps that the leads could short to, but you can always slip some insulation over the leads.
  7. (*steve*)

    Using a radial cap instead of an axial one - shielding needed?

    These are probably filter capacitors, and no shielding is required. If the capacitors were in the signal path, your best option would be to use the shortest lead length on the higher impedance side and route the lead to the lower impedance side as best you can. It may be better to keep the...
  8. (*steve*)

    Hello, Welcome! (Introduce yourself)

    You'll have to speak to @eeadam or @eerob for that.
  9. (*steve*)

    Long Range Peer to Peer?

    As long as you have line of sight, and suitable antennas 4km is nothing. My first long distance link was from my house to a central hub that was about 15km away. There's plenty of 5GHz equipment available that's actually built into small dish antennas. At 2.4GHz you can make the antennas...
  10. (*steve*)

    Fixed interval Jacob's Ladder?

    The easiest option is probably too have a momentary switch controlling the power.
  11. (*steve*)

    Fixed interval Jacob's Ladder?

    Ok, so 12V is way too low. Consider 12,000 volts a starting point. Our Jacobs laddar uses a neon display transformer with an output voltage of around 12kV. The low voltage side (240VAC) is switched using a contractor that is controlled from a 24VDC circuit. The entire device is enclosed in...
  12. (*steve*)

    Isolation Transformer?

    Wow. No wonder you got booted from other sites. Do you want us to explain why that's not a realistic option, or will you just believe us? Apart from the fact that I find your story rather unbelievable, I am worried that your skill level is far too low to be considering this. My strongest...
  13. (*steve*)

    Isolation Transformer?

    Apart from the electrostatic shield and the optional earth passthrough, what else?
  14. (*steve*)

    Fixed interval Jacob's Ladder?

    The only parts subject to failure are the electrodes that carry the arc and the ionisation electrode if you use one. We use galvanised rod for the main electrodes. The zinc coating is removed by the arc over time and you can get a bit of surface rust forming. Our ionisation electrode is one...
  15. (*steve*)

    Triggering an event using Esp32

    Have the esp32 connect to a wireless network and do it that way.
  16. (*steve*)

    Please explain this resistance reading

    I prefer to think of a short as an inappropriate (usually additional) load placed on some part of a circuit resulting in some undesired change in behaviour. I'm pretty sure this wording encompasses all of the descriptions given above. This description covers the two necessary conditions: The...
  17. (*steve*)

    Nakamichi RX-505 Low 12V + and - Rails

    This schematic has large parts of it going right to left, so it's a bit odd... A key thing you show is the voltage either side of Q402. It shows that there is ample unregulated voltage ( 19.7V) upstream of it. That means everything to the right of it is likely OK (with a caveat mentioned...
  18. (*steve*)

    Long Range Peer to Peer?

    Wifi
  19. (*steve*)

    Oscilloscope question about sine wave.

    Comparing the waveform on a DC coupled vs AC coupled display should give you the information you require. Any vertical shift of the display indicates that it is not symmetrical around zero volts.
  20. (*steve*)

    1.5 volt bulb won't light in my circuit newbie

    Try reading the voltage when the bulb is connected. Do you know how much current is needed to light the bulb? Try measuring it using a 1.5V battery (make sure you know how to measure current first). Then measure the current drawn from the 9 Volt battery when your voltage divider is connected...
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