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  1. Arouse1973

    RC Time Constant

    First off, find the correct formula. You will need to search for capacitor charging formula. You don't need to worry about Coulombs and all that. Adam
  2. Arouse1973

    RC Time Constant

    This shows a 1K and a 10uF cap, see if you can work out the voltage on the cap after 1 RC...is the graph correct? Adam
  3. Arouse1973

    Which chip used to optimize measuring many batteries.ject

    You can MUX in the output from the primary resistor yes. So you drive which ever transformer you want and then read back the voltage from the resistor you want using your MUX to switch it. Adam
  4. Arouse1973

    RC Time Constant

    1 RC is the time it takes to reach 63% of the applied voltage. I'll do you an example, give me a mo.
  5. Arouse1973

    RC Time Constant

    Go for it. Where is your blog? Do you want us to check it out for you? Adam
  6. Arouse1973

    RC Time Constant

    Or you save some money and ask us :) It's free lol Adam
  7. Arouse1973

    Which chip used to optimize measuring many batteries.ject

    Here is part of the circuit. Thanks Adam
  8. Arouse1973

    RC Time Constant

    The RC time constant is just that 1 RC not 5. 5 RC is when the capacitor is considered fully energized. 1 RC is when the capacitor is energized to 63% of maximum. This is because when the formula for the energizing of the capacitor = 1-e^-1 = 0.63 the -1 is - t / RC so when RC is the same as...
  9. Arouse1973

    Which chip used to optimize measuring many batteries.ject

    You can do this with a small 1:1 transformer across each battery. You will need a diode to prevent the shorting of the battery and a resistor on the primary so you can measure the voltage across it. Pulse the primary winding with a short pulse and measure the voltage across the primary...
  10. Arouse1973

    simple current limiting to 2A with TIP122

    Look at a resettable fuse or PTC, might be easier option. Adam
  11. Arouse1973

    Adding a spur to a radial circuit (UK)

    So as far as I am aware you can only have one spur per socket. So if the feed into your garage is not a spur then you can spur off the socket in your garage once. If you then spur off again for the light I think this would be two spurs and that's not allowed because the max spur current is 13...
  12. Arouse1973

    simple current limiting to 2A with TIP122

    Do you need constant current or a current limiter. Very different things. Adam
  13. Arouse1973

    Adding a spur to a radial circuit (UK)

    How far is the shed from the garage? Thanks Adam
  14. Arouse1973

    Which chip used to optimize measuring many batteries.ject

    Are the batteries in series or parallel? Adam
  15. Arouse1973

    simple current limiting to 2A with TIP122

    Why don't you just use that circuit? Otherwise we need wayyyyy more information. What is the load you are driving, what voltage, that sort of thing. Adam
  16. Arouse1973

    For LEDs, is there a device that maintains a steady "power" output, interms of watts or amps?

    Here is a simple circuit with only a few components. There are better devices now for doing this, but this configuration shown bellow should work fine for you as long as you don't stress the device beyond it's max limits. The data sheet will give you the electrical characteristics of the device...
  17. Arouse1973

    Switch question.

    Ummmm..... I would try and get them from RS or Digikey and check the data sheet. EBay can be a bit of a pain, that's why I don't use them anymore. I prefer Amazon personally.
  18. Arouse1973

    Switch question.

    Yes, they often use the term MOM for momentary. Adam
  19. Arouse1973

    Switch question.

    I am not sure how they work inside but that is what I would order if I wanted a switch to spring back. Unless they have named it incorrectly. Adam
  20. Arouse1973

    For LEDs, is there a device that maintains a steady "power" output, interms of watts or amps?

    Using a constant current source will ensure the correct current is maintained for the LED string. It adjust it's output voltage to do this, so some of the LEDs may have a different voltage drop but will all draw the same current. You set the current to what you need and that's it. Adam
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