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  1. Arouse1973

    Large capacitor for power outages?

    Hi PizzaCombo If your router has a power adaptor which most do then this can be done. Linear Technology do a wide range of super capacitor chargers and I am sure there will be one for your needs. Basically you need to choose one which will switch in the super capacitor when power is lost from...
  2. Arouse1973

    Circuit to activate the uC interrupt

    Just be aware that the circuit will pick up the mains frequency from indoor lighting. What effect this will have if any is somthing your going to have to test. Thanks Adam
  3. Arouse1973

    pictures

    Cheers Dave. Thanks mate. Adam
  4. Arouse1973

    Night sensor

    Hi Kris Yes quite. But If I asked 50 engineers to connect a single resistor in parallel with a battery I bet they all connect it across the battery. Lol. This is why we tend to ignore the battery as a component and just look at the components after the battery as being in series or parallel...
  5. Arouse1973

    IGBT problems

    Can you supply a diagram of how its connected and how you are measuring the resistance. Thanks Adam
  6. Arouse1973

    Need help with problem diagnostic

    The diode is called a MELF. It does not have any legs. Thank Adam
  7. Arouse1973

    Transformer coil resistance query?

    Yep mig welder tranny is indeed step down. You wouldn't have to run this on mains actually to get a large current. We are not talking about running this on a PP3 he will need an old car battery or somthing like that. Don't know what smps he is planning on using he doesn't say. Adam
  8. Arouse1973

    pictures

    What is the easiest way to put pictures on this forum? Thanks Adam
  9. Arouse1973

    PEAK battery charger

    Try wurth electronik they have lots. The size sort of relates to their rating, from what I remember there are 10mm 14mm 20mm. Now the 20mm come in 6000A and 10000A the others are between 1000 and 2000A I think. In the UK the lowest value would be 275V rms. But that's pushing it a bit, I would go...
  10. Arouse1973

    underground fault locator

    If you want to induce a current into your measuring device you can only do this if the magnetic field is changing. Otherwise you have to measure the electric field. If you are able to connect to one side of the wires you could make a TDR which sends out a pulse and measures the time for the...
  11. Arouse1973

    Night sensor

  12. Arouse1973

    Night sensor

    Hi Kris I think we might have our wires crossed here. I am not the original poster but you were lecturing me as if I were. It was an incorrect statement to say an LED needs a CONSTANT current source to work. It does not. The LED needs a source of charge to work and this can come from either a...
  13. Arouse1973

    Transformer coil resistance query?

    I am pretty sure this is how a Mig welder works. It has a large primary winding and small secondary winding. It will give you only a few volts on the output but with 100s of amps. But of course this runs on mains. Thanks Adam
  14. Arouse1973

    Reducing the Voltage to a square root of itself

    f Thanks Steve. Adam
  15. Arouse1973

    Reducing the Voltage to a square root of itself

    Hi Steve what is Circuit two doing, you don't really explain. And how the hell can 10-7 equal 1.:)
  16. Arouse1973

    Night sensor

    Forgive me if I am wrong but I didn't think LEDs needed to be supplied with a constant current, I thought they needed a current source. This is different. For standard 5mm LEDs a resistor in series and a battery will provide a current source but the current will start to fall as soon as the LED...
  17. Arouse1973

    the circuit not working

    I got this working in LT-Spice. Works fine. I think your problem is two things. 1) The inductor value is too low as already mentioned. 2) Putting two inductors together is not the same as having one inductor and trying to connect to the centre. You need to have mutual inductance between the...
  18. Arouse1973

    Hysteretic Buck converter circuitry?

    Sorry just notice your one GND connection at the bottom of the page. I really am confused now what is AAA supposed to be because you have it connected to your LEDs through the inductor. Adam
  19. Arouse1973

    Hysteretic Buck converter circuitry?

    Not sure what you want this circuit to do, control the current through the LEDs is it? But just having a quick look it looks like you have AAA(GND) connected to the 0.2R resistor and the inductor on the output, is this correct. Also you would be better using the correct 0V(GND) symbol for your...
  20. Arouse1973

    Controlling power output

    Based on what voltage would you like to turn on the device, maximum output, minimum or something in between? Being a 10bit result there are quite a few divisions of the supply voltage on the output. Thanks Adam
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