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  1. Arouse1973

    Quick question about AC/DC adapters

    I need to point out that the internal resistance of a fresh AA battery will be less than 300 mOhm. The voltage drop will be quite small maybe only 100 mV not enough to limit the current to a safe level. So you can not rely on the internal resistance of a fresh battery to limit the current...
  2. Arouse1973

    need help going green and willing to pay for help! solar / relay / timer control

    Ok I found the micro inverters on YouTube and there is no separate output. Two ideas I have Henry. With additional relay switching components / processing components / Timer components. These options are. 1)...
  3. Arouse1973

    need help going green and willing to pay for help! solar / relay / timer control

    Do we know the model number of the inverter? I'll have a look if they can be worked another way. Adam
  4. Arouse1973

    need help going green and willing to pay for help! solar / relay / timer control

    To prevent a shock to utility workers who might be digging up your road and have cut the power to your house. The inverter needs to shut down. But I am not sure if the mains coming in links to the output internally or if there is a seperate PV mains output and domestic mains output. Adam
  5. Arouse1973

    need help going green and willing to pay for help! solar / relay / timer control

    Yes is this just the input? What about just feeding mains in but dont connect the output. Or is there only one output which is either PV or mains? Adam
  6. Arouse1973

    need help going green and willing to pay for help! solar / relay / timer control

    Wow a lot has happened in a weekend. I might have missed something but why cant you disconnect the mains and just run the AC of the solar units. I know it needs mains all the time but what load does it need to stay on. Adam
  7. Arouse1973

    need help going green and willing to pay for help! solar / relay / timer control

    This must be getting irritating now for Henry. My first post mentioned current transformers which are these clamp on things others mentioned after this. Its time I think one of us drew out some wiring diagram for Henry to check that it is his current connections. I will do this next week as I am...
  8. Arouse1973

    Optocoupler stays on

    You say it's fine but earlier on you say it stays on? You can't simulate a different circuit it won't give you the same results. You need the resistor to protect the Triac from high dI/dt when the Triac switches back on and also to decrease the dV/dt turn off time (commutation) to prevent false...
  9. Arouse1973

    need help going green and willing to pay for help! solar / relay / timer control

    Hi Henry Could you use two current transformers to measure the difference between the two feeds or arrange the wiring so you did have two feeds. Then switch them out when the imbalance is a certain amount? It would be nice to see a wiring diagram of what you have. Adam
  10. Arouse1973

    Optocoupler stays on

    I don't think Fish was saying you can't drive inductive loads, he wouldn't have meant that. The problem with large AC inductive loads is the phase difference between current and voltage. They don't cross zero at the same time, this can gives issues with the Triac turning off. To counter act this...
  11. Arouse1973

    Optocoupler stays on

    You really should draw your circuit with the correct components. You had be staring at that for a while thinking well what's wrong with that? Then I looked again and noticed you had put the part number for the device. It turns out to be a Triac driver output. This is your problem, the driver...
  12. Arouse1973

    I would like to build tach for a small diesel. magnet, sensor, counter, LED

    That's a good one debe, with the addition of an LM3914 and a few other components it would be able to drive a bar graph display. Adam
  13. Arouse1973

    Simple NPN transistor circuit help

    Maybe they are white LED's you wouldn't see the light arrows from them on white paper :)
  14. Arouse1973

    Flasher Help?

    Yep and I think the guy who drew the original circuit got the connections wrong.
  15. Arouse1973

    Flasher Help?

    And this one.
  16. Arouse1973

    Flasher Help?

    Here is something I also found. Adam
  17. Arouse1973

    Flasher Help?

    Yes indeed, how could the pilot light work without a connection to 0V. Unless it is using the body which might be metal. Adam
  18. Arouse1973

    Pic sine wave inverter H-bridge

    Hi Wingnut You don't have a brother called washer by any chance do you :) Can we see a circuit diagram? What pulse timings are you using? Thanks Adam
  19. Arouse1973

    The BJT as an Amplifier homework question

    Hi Roy Is this signal a sine wave? re do they mean RE (Emitter Resistor), re is the intrinsic emitter resistor and is 25 mV/ IC. Do you have a circuit diagram. Thanks Adam
  20. Arouse1973

    I would like to build tach for a small diesel. magnet, sensor, counter, LED

    Did you Google at all? http://www.electroschematics.com/451/digital-bike-tachometer/ Adam
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