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  1. Arouse1973

    BASIC LED project - help/advice required

    Here is something I have just drawn up for you that might work. You can Choose your own suitable LEDs and comparator, and this does not have a timer at the moment and you will need to set the threshold for dark. For the best results choose a light sensor that has a similar spectral response as...
  2. Arouse1973

    Wrist Device

    Over what distance? Adam
  3. Arouse1973

    Mapper

    I use a screen grab program in windows 7 and save as a picture. Adam
  4. Arouse1973

    Poles and Zero's

    Oh well, 47 views and no replies, that's a shame :(
  5. Arouse1973

    Split Rail Power Supply

    What do you mean ones you liked. That means you have a preference then? Which is what? Current and voltage output? You say work with which usually means take in at the input. Or do you mean a variable output from 3V-32V. Adam
  6. Arouse1973

    My new toy

    Nice, bit of a beast by the looks of it.
  7. Arouse1973

    AC Question

    Yes Dave I believe it's the TN-C-S earth system with PEN connection and is used because of the fear that the outer earth sheath of the cable from the transformer could become corroded an ineffective as an earth. Adam
  8. Arouse1973

    8-Bit Music

    This device will record music but I think it's in real time so you would have to play them on say an mp3 player into the device first. Don't know if this is what your after. http://www.seapraha.cz/download/apr9301v2-v2.3.pdf Adam
  9. Arouse1973

    Poles and Zero's

    Hi Guys Does anyone know how to work out the position of the poles and zeros in the s plane of a simple LCR filter. I would like to see a step by step example on how they are derived. The internet does not explain the steps good enough for me. Here is what I understand so far. the transfer...
  10. Arouse1973

    electronics help!!

    Yeah good give it a go. Adam
  11. Arouse1973

    Newbie Question - 1A at low voltage vs 1A at high voltage

    I have been doing this for over twenty years and I still have unanswered questions because you don't stop learning. That's what is great about sites like this, you get stuck in a rut at work doing the same old thing. It's very refreshing to find people who enjoy it as much as you do. And yes...
  12. Arouse1973

    electronics help!!

    The reed switch should be quick enough if not then a hall effect sensor would do it. The circuit you need is a mono-stable. Google this and see if you can come up with anything. If not I'll draw you something later. Have a go and don't worry if you get stuck. Adam
  13. Arouse1973

    Newbie Question - 1A at low voltage vs 1A at high voltage

    Yes I agree Dave. I always like to use the term flow of charge and not really worry about what the electrons are doing. Because in a.c circuits they don't do anything really just sit there vibrating and don't move around the circuit. Adam
  14. Arouse1973

    Newbie Question - 1A at low voltage vs 1A at high voltage

    Watts is joules per second just like current is coulombs per second. 1W is the rate of energy needed to move a coulomb of charge through an electrical potential of 1Volt. The higher voltage requires more energy to move the coulomb of charge because of the larger electric potential. So for the...
  15. Arouse1973

    USB oscilloscope

    That's got the data logger function and will be more expensive. I don't think you will get one for 130-USD. Here is the cheapest new one I could find. http://www.lambdaphoto.co.uk/picoscope-2204a.html?gclid=CK_i-ub_q70CFUjItAodClMAsQ
  16. Arouse1973

    Protecting logic inputs and outputs that go to external connectors

    I thought he was concerned about ESD? A spark gap is cheap and easy to implement, you just bring it closer until you have a the correct spacing for the amount of expected ESD. A few millimetres is normally all that's needed. Thanks Adam
  17. Arouse1973

    electronics help!!

    What about a magnet on the car and a reed switch on the track. When the car passes over the reed switch this can then trigger the solenoid and switch tracks. you would need a bit of circuitry to do this. If this seems a plausible approach I could draw you up something. would you want the...
  18. Arouse1973

    Whats the difference -volts and GND (0 volts)

    For me this is one of the most misused terms in electronics and even IC manufactures haven't helped matters either by labelling there inputs +V and -V. This is how I use all these terms. The + and - signs merely show the direction of conventional current flow of the circuit. But the use of the...
  19. Arouse1973

    Purpose of a cap in a circuit...??

    C13 is a smoothing capacitor which helps stabilise the supply voltage when the ICs outputs switch. They also supply large short bursts of energy needed for transients in the circuit like switching capacitive loads etc. and to reduce the supply drooping and causing circuit stability issues. I...
  20. Arouse1973

    Low Voltage Power Supply

    Current limit circuit to help you. See if you can work out what it is doing. And your right the zener is a voltage reference. The pot is there to adjust the amount of voltage going to the input of the op-amp. This sets your output voltage. Adam
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