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  1. Martaine2005

    My first circuit is a bit advanced (H-bridge!)

    You need to learn the basics. Ohms law. V=I/R. Martin
  2. Martaine2005

    What are these?

    Steady on now. Brighton is the closest with the OPs description:)
  3. Martaine2005

    Transformer to build 12 volt battery charger

    Happens to us all :) hope they’re ok though!. Martin
  4. Martaine2005

    What are these?

  5. Martaine2005

    What are these?

    Is this something from your Xbox PCB? Martin
  6. Martaine2005

    Questions regarding H-bridge

    Funny that. I put 1000V but edited it. Martin
  7. Martaine2005

    i need help with my instrumentation assignment. It's about fontana bridge circuit :)

    AND…. This thread is nearly 5 years old. You’ll get more responses by opening your own thread. Martin
  8. Martaine2005

    Questions regarding H-bridge

    Diodes are unidirectional (sort of). They conduct one way when forward biased and break down when reversed biased, allow current to flow in the opposite direction. Zeners are designed to do this. The technical term is avalanche I think or zener affect. A normal diode, say 1N4007, has a high...
  9. Martaine2005

    Need help desoldering

    The photos have to be 300kb or so. I know, it really should say what the problem is. I have replaced quite a few without issues. However, some are quite difficult when they have metal shields and thick terminals to the ground plane. I sometimes have to use ‘overkill’ which is a 100W iron, but...
  10. Martaine2005

    B&O Beogram 1900 bad motor?

    Do you have voltage at the motor when it’s supposed to? Martin
  11. Martaine2005

    Transformer to build 12 volt battery charger

    @kellys_eye I think that boat sank nearly 9 yrs ago. No problem though, I relayed this message in a bottle. Martin
  12. Martaine2005

    The first inductor in the SMPS

    It is a common mode choke. It cancels noise on the lines. It is a suppressor. A filter if you like. Martin
  13. Martaine2005

    NAD 3020A Amplifier Low Volume

    Martin
  14. Martaine2005

    Need help desoldering

    It’s hard to say because normally adding fresh solder and flux easily does it. Some use a low melting point ‘chip quick’ that also seems to work, I haven’t used it so can’t advise. Lead free solder is notoriously difficult to work with but adding leaded solder always works for me. I use 15W, 25W...
  15. Martaine2005

    Help with two wires please

    Fortunately, he now has a photo. I do and always advise others to take a photo of items before this happens. Martin
  16. Martaine2005

    Help with two wires please

    Try posting another picture keeping it below 300Kb. But vey clear and focused. Other side of board might be helpful. I take it that the blue and red go to batteries? Martin
  17. Martaine2005

    Part ID

    Try searching for 1N917 Martin
  18. Martaine2005

    Replacing electrolytic cap with non-polarized a mistake with tube radio?

    I agree with @BFM. Mr Carlsons Lab is a great channel. You could also add a switch on the unit for floating and grounded.
  19. Martaine2005

    Does anyone know what this is?

    That looks like a common mode choke. Unless a winding has broken and is shorting the other side, I doubt it is faulty. Check that white oblong component next to it. It’s probably an X2 class class capacitor that has shorted. Martin
  20. Martaine2005

    Radio

    I still feel the OP was talking about a can. But let’s wait for a response. Martin
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