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  1. (*steve*)

    Schematic suggestions???

    Check out the datasheet for the TP4056. There are plenty of other chips out there to, but this handles all phases of charging (low voltage, constant current, top up and finally, low current shutoff). It also monitors cell temperature. Sure, it would be large if it wasn't a single 9 pin device...
  2. (*steve*)

    Can you names the parts???

    Actually it is the tolerance. K = +/-10%
  3. (*steve*)

    Component identification please!!

    That 330 may be 33uF. Often when you see these three digit codes, the last digit is the power of ten to multiple it by. Just to make life more interesting, a capacitor can be marked in uF or pF., So 33uF may be marked as 33, 330, or 336. Typically values under 10uF are marked in pF, so 2.2uF...
  4. (*steve*)

    Can you names the parts???

    680 means 68 x 10^0 = 68 x 1 = 68. Also, it's not strictly incorrect to refer to a capacitor as a tantalum electrolytic, but since all tantalum capacitors are electrolytic, calling them "tantalum capacitors" is sufficient and pretty much universal. In general, where you know what the...
  5. (*steve*)

    Schematic suggestions???

    You could just get 4 single cell chargers based on the TP4056 chip. You will require a 5V power supply capable of 4A or more (I'd recommend 5A minimum). Small boards based on this chip are available from eBay at a price less than you could make them.
  6. (*steve*)

    to hire someone who knows s/w turn ckt-diag into PCB Gerber fabrication files

    There are lots of us who can, but even for simple circuits there is a significant amount of work.
  7. (*steve*)

    nixie clock problem

    Fingers crossed. I'm hoping that when you set DST you also accidentally set something else which caused the "fault". The recommendation in the manual is that you note down all the values in the settings. This sounds like good advice. After making a change (say DST again) you can confirm that...
  8. (*steve*)

    Window comparator help (Battery monitor)

    You can get simple 3 terminal voltage detector chips which will output a signal when the voltage drops below some value. This can be used to enable and disable an oscillator (perhaps one based on a single Schmitt trigger. If I find the time I'll draw up a circuit and suggest some parts.
  9. (*steve*)

    nixie clock problem

    Ok, got it. Try the reset option
  10. (*steve*)

    nixie clock problem

    According to a manual I read (your url went to a non-existent page) if the clock is configured to turn off the digits, a short press of either of the config buttons will display them again for 1 minute. Does this happen on yours? I found the manual for a nixie clock with 2 digits...
  11. (*steve*)

    Brake light flasher (555 - based) circuit works on breadboard, but not PCB

    It's a thing that I'd raise on a forum dedicated to fritzing. The trace doesn't look like that in the layout you uploaded. It is part of the filling of empty space with a ground plane. often these are stitched together, even if they're not, it's no great issue in most cases. If you were...
  12. (*steve*)

    redundant circuitry

    2500 times per minute is about 42Hz, not 25000000Hz.
  13. (*steve*)

    Negative Voltage

    It may be 0V as measured against some reference point, or it may be the reference point itself. I'm not really enthused about the word "concrete". If you mean stable, or well known, or something like that, then I'd be happier. 0V on a supply rail suggests it is the voltage reference. 0V...
  14. (*steve*)

    How sweet it is to be an idiot

    I think it's worth replying to this again. This comment is very similar to things the moderators have said to each other about people and posts. Whilst @fios agaibh isn't a moderator, after reading his post I did consider whether I had done the right thing. His opinion is valid regardless...
  15. (*steve*)

    nixie clock problem

    Post a copy here, out send it to me via PM if it's not appropriate to post it here. The main question I have is whether this process could have damaged the clock. If there procedure required some combination of button presses vs opening up the unit and soldering a jumper, I'd probably start...
  16. (*steve*)

    Negative Voltage

    Imagine you are standing at ground level in front of a building that has 11 storeys above ground and three storeys of parking below it. This building is not in the US, so you expect to enter at the ground floor and go up one level to the first floor, another level to the second floor, and so...
  17. (*steve*)

    nixie clock problem

    What was involved in setting DST?
  18. (*steve*)

    How sweet it is to be an idiot

    For everyone else, a short excerpt:
  19. (*steve*)

    How sweet it is to be an idiot

    Oh, you're going to love it. All one paragraph too.
  20. (*steve*)

    Will this work???

    I think the answer is that you can make a resistor from a couple of nichrome wire. A normal resistor should not get anywhere near hot enough to vaporise the liquid you use.
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