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  1. (*steve*)

    MPPT charge controller

    MPPT only really makes sense if you're charging from a source which is capturing power directly from some fluctuating external source (e.g. wind, solar, wave). MPPT used from a battery might optimise the fastest charge, but it would not maximise the total energy transferred from the battery...
  2. (*steve*)

    Design of a transistor curve tracer

    We look forward to pictures of your screaming red transistor tester (SRTT?)
  3. (*steve*)

    How exactly does a capacitor charge?

    It is a basic unit of measure which compares the frequency of a signal to that of a submultiple of the frequency corresponding to the transition between the two hyperfine levels of the ground state of the cesium 133 atom. It superceded an ancient measure which required one perform a similar...
  4. (*steve*)

    555 or one shot

    It appears that the output has the common, NC and NO terminals. Using the NC terminals, these will stay closed for a short period after the power is connected. And that is essentially what is required. Sure, the relay stays energised all the time, but as long as this power drain is not a...
  5. (*steve*)

    Power distribution in a project

    @LittlePebble10, as the owner of a modular synthesiser, I wish you well. Another problem you may be having (and it's hard to tell) is that if you're combining the outputs of several oscillators, and the outputs of the oscillators aren't buffered or isolated in some form (maybe driving the...
  6. (*steve*)

    New from Fathemistic Fantasy

    I think it's also worth pointing out that this is very much an international forum. This is important for several reasons: In a lot of places around the world one's religious beliefs are considered a private matter and are not typically discussed in public. In this respect the US is a bit of...
  7. (*steve*)

    Power distribution in a project

    Depending on what you're doing, bypass caps may be the answer. If you have a more concrete example we may be able to give you a more concrete answer.
  8. (*steve*)

    New from Fathemistic Fantasy

    Hi @LittlePebble10 and welcome to Electronics Point Generally speaking, if your topic of choice fits into one of the forum categories, go for it. Having said that, I'd have to point you to the Off-Topic Member's Lounge for religion. Personally, I think most people find it about as welcome...
  9. (*steve*)

    Davis Vantage Vue weather station: stop replacing battery

    A zener side is not ideal. I would recommend 2 X 1.5V batteries as a temporary measure. I know I bought more than 1 on those regulators because I have 2 of those units to repair. If I bought more than 2 (and I can locate them), I may be able to knock up a 3V regulator for you. Of course...
  10. (*steve*)

    Davis Vantage Vue weather station: stop replacing battery

    Oops, 600B. The thread is here. And the regulator is an AP7365. I used the adjustable one. It is a low drop out device with a maximum input voltage of 6V. So a lithium cell or three 1.5V batteries would work fine for a 3V output.
  11. (*steve*)

    Davis Vantage Vue weather station: stop replacing battery

    TheThere some very low power regulators available. When I had to replace a 1.35V mercury cell in a piece of equipment (that was used as a voltage reference) I used a pair of AA cells and one of these regulators. The quiescent current is so low I decided a power switch wasnt required...
  12. (*steve*)

    Davis Vantage Vue weather station: stop replacing battery

    What about an LiFePOr? A nominal cell voltage of 3.2V would likely be safe. The only thing I don't like about using this type of battery is the risk of damage when they are over discharged. They could easily become single use :-(. A pair of high quality D cells would probably last their...
  13. (*steve*)

    Spare Components

    Good advice @kellys_eye And let me reiterate that there would certainly be people here who would be happy to look at any photographs you post to give you a more detailed idea of what you have.
  14. (*steve*)

    What's the "danger zone" for tesla coils?

    You win :D
  15. (*steve*)

    laser ablation of PCB resist

    It's actually a maximum more than a minimum. A higher power laser makes it harder. Something under 60W would be my preference (unless it has a really small spot size and a very fast head). Lower power lasers will take longer. The minimum power would be where you can't it to remove the paint...
  16. (*steve*)

    What's the "danger zone" for tesla coils?

    It's certainly possible to get burns from these. And the magic thing is that they don't tend to hurt while they happen. As an example, I presume you've seen those battery powered plasma globes that emit streamers inside a plastic globe. You can move the streamers by placing your hand or...
  17. (*steve*)

    Solenoid amperes ???

    If you're just interested so you can make sure your power supply is capable of driving it, OK. But remember that your power supply only needs to be able to supply enough current (not the exact current). If the total load is 2.5A, a power supply capable of 2.5A or more is OK (personally I'd...
  18. (*steve*)

    I need to get a HP 54121A Test set repaired. Its trigger input works intermittently

    There is a full service manual available here. You will have to register (kinda) to download it. It has everything short of the schematics.
  19. (*steve*)

    laser ablation of PCB resist

    Some people have suggested running solder all over the board. Maybe I'm biased, but it's not what I call quick or fun. Here's two boards, one with suffer in the tracks, the other with chemically deposited tin. The one with chemically deposited tin was a lot easier to solder to too. Maybe...
  20. (*steve*)

    Cost effective prototyping for testing components

    One of the largest variables will be how these are soldered. BGA parts can exhibit lower reliability sure to poor soldering. This is especially true if you're doing it at home.
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