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  1. Arouse1973

    how to find resistor value ?

    Yeah Funny Bob, like it :) Adam
  2. Arouse1973

    4-20mA using XTR111

    Probably not worth it now but here is my approach to working out the feedback resistor value for the first schematic. We want to drop 4 Volts - 0.5 Volts across the top 120K so that’s 3.5 volts / 120 K = 29.16 uA We know the bottom 120 K will have 0.5 volts across it. So it steals 0.5 Volts...
  3. Arouse1973

    4-20mA using XTR111

    God it's so simple when you look at it again. To achieve 0.5 V on the inv terminal the output has to go to 0.4 V so effectively the gain is less than 1. As the input goes up the gain changes, when the input is 2 Volts the output will match this because the two inputs will also be matched due to...
  4. Arouse1973

    Looking for someone who can solder

    Thats clever Dave. Oh I must get some more bonde hair dye lol. Adam
  5. Arouse1973

    Looking for someone who can solder

    How can they contact you if you have removed your email :) Adam
  6. Arouse1973

    Light intensity detector

    Good Jerid what are NPN resistors? :) Adam
  7. Arouse1973

    Now this is funny!!

    Great love it. Adam
  8. Arouse1973

    Why does longer probe cable reduces bandwidth

    Yes and its series capacitor. And this is the reason x1 probe has lower bandwidth because you have shorted out the capacitor at the tip. Adam
  9. Arouse1973

    4-20mA using XTR111

    Thanks Kris Adam
  10. Arouse1973

    scr driver circuit for battery charger

    Oh 160 Amps, thats a bad boy. Fair enough. Adam
  11. Arouse1973

    newbie: How to start ???

    What aspects of electronics do you have interests in? Analog is the right answer digital is the wrong answer. Only joking digital electronics brings me out in a rash lol. To be interested in something means you must have question, so then ask away. Other than that get a good basic electronics...
  12. Arouse1973

    Light intensity detector

    I agree not very good maybe you could draw him up something better? Adam
  13. Arouse1973

    Copyrighted???

    I doubt they will object if it could mean others buy their kits. Adam
  14. Arouse1973

    Mobile version of forum

    I am sure Beaker will be pleased. Adam
  15. Arouse1973

    Intro sent, now my question

    :) no worries mate Adam
  16. Arouse1973

    Intro sent, now my question

    You just wrote on my wall for some reason? Reply to the message so everyone can see. Yes I think you are right with your assumptions. Cheers Adam
  17. Arouse1973

    Using electronic gear bought in the U.S in Thailand

    As long as the output of the PSU matches the requirements of the device you are powering then yes. Quality of some PSUs might be an issue so watch out. Adam
  18. Arouse1973

    New (well back into) the game

    Hello Colin Adam
  19. Arouse1973

    Intro sent, now my question

    Would a sound recorder chip do the job? You record a sound to it which plays back the sound when you trigger it. Bit like the ones you get in those joke cards. Adam
  20. Arouse1973

    Help to make a switch from an led and sensor pleasr

    A simple circuit like this. If it turns out to be too slow then we may need to use a fast comparator. LED1 and FT1 are the break beam. You need to choose a fast transistor maybe an epitaxial type. Adam
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