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  1. Martaine2005

    Wallbox project charging electric car

    Here is a link. But it won’t have wiring diagrams. But is an interesting read. https://www.ti.com/lit/wp/szzy007a/szzy007a.pdf?ts=1613977162083&ref_url=https%253A%252F%252Fwww.google.com%252F Martin
  2. Martaine2005

    Designing a soldering iron for limited dexterity

    Funny you should mention that. I watched this one on Thursday. Martin
  3. Martaine2005

    Designing a soldering iron for limited dexterity

    I think you may need to start with collecting data from individuals who want to be able to solder. ie: missing limb, arthritis, gout, Parkinson’s or any other condition/disease. Then concentrate on one design for one specific problem. This won’t be a one fix cures all. Very difficult in my...
  4. Martaine2005

    Designing a soldering iron for limited dexterity

    Hi Chris, although I think this is a great idea, I also think it’s far from being practical. Given that soldering is never the same item nor the same area, it’s sometimes difficult without dexterity problems. If you’re referring to a production line scenario, dedicated tooling can be designed...
  5. Martaine2005

    Why is it PNP instead of PPN for transistors

    That would be hydrogen. The main reason for the catastrophic meltdown in midair was the ‘dope’ they painted the fuselage material with called Thermite. Martin
  6. Martaine2005

    King Kong massage chair

    Try searching this forum. There are many massage chair threads. Martin
  7. Martaine2005

    Novel voltage doubler circuit need help plz

    Some people ask “ what’s the point of this?”. ELECTROBOOM : “what’s the matter with you, can’t you see she’s sexy?”. Martin
  8. Martaine2005

    Heathkit Super Clock GC-1195 w/chimes

    In post #17, I gave you that resistance, 66Ω and 80Ω. I also said it’s probably better to stay at 100Ω or more depending on how bright you want the LEDs. @bertus then explained to change R219 upto 1K. Martin
  9. Martaine2005

    Noisemaker Revenge Machine

    Thanks for sharing. Such a shame that some people are so ignorant. My mother had similar with a neighbour upstairs. We offered carpet too. It escalated when my mother was flooded once a week. Yep, once a week!. Upstairs always had their window open, I used to wait until 3am and then send in...
  10. Martaine2005

    Noisemaker Revenge Machine

    Regarding running the board and motor from the same power supply. If it gets too warm, change it for a higher amperage ie: 3A for a 5A adapter. Double sided tape will depend on the quality and location. I’d probably drill a small hole either side of the board into the housing and put a zip tie...
  11. Martaine2005

    Noisemaker Revenge Machine

    Glad it worked out for you. All the best. Martin
  12. Martaine2005

    Novel voltage doubler circuit need help plz

  13. Martaine2005

    please make this

    What purpose do you think this has? It isn’t free electricity. How do you think he charged that super cap? Why did he also use a button cell battery? Let me give you a clue. That LED would work without his magnetic North spinny thingy if connected directly to the button cell. But, show me the...
  14. Martaine2005

    Ideas for electronic devices...

    Just buy Amazon electrical returns pallet. Fix the broken items, keep some and sell the rest. Most of it actually works but the packaging is damaged or instructions are missing etc. What test equipment do you have? Martin
  15. Martaine2005

    Heathkit Super Clock GC-1195 w/chimes

    What are the voltages when it’s bright and dim? Martin
  16. Martaine2005

    Heathkit Super Clock GC-1195 w/chimes

    If it’s 5V supply and 3.4V Vf, you only need to drop 1.6V. For 24mA a 66Ω resistor. 20mA an 80Ω resistor. But you wouldn’t really want to go lower than a 100Ω. You might find it’s too bright and only want 8 or 10mA. So 160Ω or higher. Martin
  17. Martaine2005

    Device powers up as soon as it's plugged into the wall.

    My unit does the same. In fact both of my different units power on when USB is connected. One of mine has an internal rechargeable battery. I just use the on/off button after connecting it to turn it off. Then the on/off button works just fine when I want to use it later. Hasn’t been a problem...
  18. Martaine2005

    Wallbox project charging electric car

    This video may have all the info you need. Martin
  19. Martaine2005

    Air Hockey Table Scoreboard help

    Also have a read of this. It may fix yours. It appears to be the same board as yours. Martin
  20. Martaine2005

    cap self discharge

    Ah yes, good point. In that case a simple experiment can provide the required answer. Charge a cap out of circuit. Measure it’s voltage. Let it sit all alone on the bench for 10 minutes, measure the voltage again. Keep doing this and you’ll see that it’s self discharging over time. Obviously the...
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