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  1. (*steve*)

    Help on identifying this resistor or inductor

    The one labelled dsPIC33EP16 is a microcontroller that is programmed. If this is damaged then you probably can't fix the board.
  2. (*steve*)

    Bc 547 vs 2n2222

    The specs of both are quite different, but if your application doesn't require something unique to either you'll probably get away with it after you've got the pins right.
  3. (*steve*)

    Upgrading bluetooth antenna

    The easiest solution would be to get similar boards that have an SMA connector rather than an integrated antenna. Then you can just purchase the appropriate antenna with an SMA termination. It doesn't have to be an SMA termination, just make sure both are the same.
  4. (*steve*)

    Capacitor or Diode?

    It certainly looks like you have damaged the board, and this will need to be repaired. How difficult this might be can't be determined without a picture. :-) And by the way, that looks like an axial tantalum capacitor.
  5. (*steve*)

    BMS for Lithium Iron phosphate battery bank LiFePo4

    I like the use of cutting boards :-)
  6. (*steve*)

    555 or one shot

    One end of the device has a block with 2 connections. Connect 12V to that. Ensure you connect it the right way around. The other end has a terminal block with 3 connections. Find the two which are connected when the power is off. They may be labelled "common" and "NC". Connect one of these...
  7. (*steve*)

    Help on identifying this resistor or inductor

    That's an inductor. Note the designation on the board of L5. It could be 1.5μH
  8. (*steve*)

    Capacitor or Diode?

    Are there similar devices on the board that you can read the markings from? It looks like you may have damaged the board removing this component. It looks like you're removed a pas with it (it's on the lead on the right hand side).
  9. (*steve*)

    wifi dipole antenna to yagi conversion

    Sure. Calculate the length and spacing of the elements, make the elements and mount them somehow at the correct distance
  10. (*steve*)

    Making a Bench Top Power Supply From a 24 Volt 5 Amp Battery Charger

    If it was a dumb battery charger then you could add a regulation stage to it to make a power supply. However, this is a multi-stage charger which will change its behaviour over time to bring a battery safely up to full charge and then (presumably) maintain it. As such it's not suitable to be...
  11. (*steve*)

    Design of a transistor curve tracer

    In English there are at least 4 meanings of "prime" To make ready (like a paint primer, or to prime a pump) The first in order, quality, etc (the Prime Minister, or prime beef) A number divisible only by 1 and itself (a prime number) An accent mark used to indicate a derivative function (f'(x)...
  12. (*steve*)

    MPPT charge controller

    They are both options. I'm not familiar enough with these devices or your detailed requirements to be able to choose between them. That's because switching regulators have a theoretical maximum efficiency of 100% (voltage in * current in = voltage out * current out, noting that current in...
  13. (*steve*)

    Tin plating

    Sorry, the pale purple was the result of the dissolution of tin in HCl. The tin contained a small amount of copper (it was a tin/copper solder), and the HCl was... who knows? Of interest, adding H2O2 to the HCl produced a bright orange red colour. So I know the HCl is contaminated, but not...
  14. (*steve*)

    Design of a transistor curve tracer

    Yes. A primer will prime (future tense). A primer is priming (present tense). A primer has primed (past tense). That general rule applies to many verbs. So, the box is primed because the application of the primer has completed its job. Just to make it more interesting, English has 12...
  15. (*steve*)

    Tin plating

    You probably should Google cupric chloride etchant. I noticed that it took far longer to dissolve the tin than suggested in the video. Also, as I noted, the solution was pale purple rather than clear. Considering that HCl sold here is generally produced as a waste product, I have little doubt...
  16. (*steve*)

    Need help on series circuit

    Here's a way that doesn't require any magic. Assume R=0. What is the current and then the total dissipation of R1 and R2. Power dissipation is proportional to current squared, and this pair of resistors just happens to dissipate 4 times the power that the target R needs to dissipate. Given...
  17. (*steve*)

    MPPT charge controller

    Switching regulators are typically more efficient. (The larger the voltage difference the larger the potential efficiency gain).
  18. (*steve*)

    Tin plating

    Yeah, follow that recipe and you'll get a solution which etches the copper. The solution needs to be acidic to work, but this demonstration has HCl providing that acidic solution. And... You have a solution of HCl and copper ions after it has started playing some tin. And what is HCl with...
  19. (*steve*)

    Comedy Thread

    Have they missed seeing our elected politicians?
  20. (*steve*)

    MPPT charge controller

    Ok. MPPT generally requires that you have a switch mode DC-DC converter controlled by a microcontroller. At its simplest, it continuously tunes the DC-DC converter to achieve the highest charge current. A more complex circuit may alter the behaviour based on battery voltage, temperature, or...
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