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  1. Arouse1973

    Mapper

    Oh sorry you didn't say it was a repetitive task. let me have a think. Oh how many would you need? Adam
  2. Arouse1973

    emf detector

    First off, how are you trying to test it to see if this works? And what results are you getting. Adam
  3. Arouse1973

    Inverter That Produces a Sine Wave

    LOL Dave, don't you mean CRAFT disease, Can't Remember a Freaking Thing. Look up KRAFTS disease on Urban dictionary. PSML. Adam
  4. Arouse1973

    Mapper

    As you say put a known resistor value, different of course on each jack in each room. Make a note of the values and then go to the basement with a multi meter and measure the resistance of each end of the receivers. This will tell you which room the jack socket is in. Adam
  5. Arouse1973

    flip relay with 2n3904

    Unemployed with your skills???
  6. Arouse1973

    flip relay with 2n3904

    Yes I agree :)
  7. Arouse1973

    Resistance to Torque: Electric Motors

    I don't think higher resistance would help at all Gregory. For a DC brushed motor. If you increase the resistance you would reduce the RPM. Torque is rotational power divided by angular velocity. Both of which would reduce with added resistance so at best with a very small increase in resistance...
  8. Arouse1973

    Op-amps and transistors for audio

    Hi Harald Done the same simulation and have attached the output. What is it doing? Is it adding the pulse widths? How could you use this signal? what did you mean by analogue signal. Thanks Adam
  9. Arouse1973

    Op-amps and transistors for audio

    Here is what I think could happen to the input signal. I have just taken some rough values to show you. The three scope traces are at 500Hz, 1k and 2K. The input was a 5V square wave Thanks Adam
  10. Arouse1973

    Inverter That Produces a Sine Wave

    Hi Chris. Doesn't that depend on the time constant versus frequency? A larger resistor would lift the signal up towards 0V and a smaller resistor should bring it down. If you go even further down in resistor value then noticeable differentiation is going to happen isn't it? I am thinking...
  11. Arouse1973

    Op-amps and transistors for audio

    Hi Harald I am pretty sure the 4R loud speaker load on the output will discharge the output capacitor very quickly and remove the d.c he wants on the output. Then you would need to remove the top resistor otherwise the transistor will be on all the time. If this is not feasible then I am pretty...
  12. Arouse1973

    Op-amps and transistors for audio

    You need to remove the output cap and the top base resistors. Other wise with the low output impedance of the speaker you with only get the rising edge of the input signal and a fair amount of ringing. Capacitors block d.c so you will only get the portion of signal as it goes from 0V to the VH...
  13. Arouse1973

    want to build a frequency generator/amp to get rid of bats in my attic

    I think you might have to get them professionally removed? But I am no bat expert! http://www.247wildlife.com/bat-repellent.htm Thanks Adam
  14. Arouse1973

    How does this LED driver work?

    Your not leaving yourself much head room for current. Only what 20mA? You will also need to rectify the output of the transformer to convert to d.c. Adam
  15. Arouse1973

    Counter

    You might be able to. But I would have thought it would be quite expensive. Why don't you have a quick look around? Cheers Adam
  16. Arouse1973

    Voltage drop reason?

    Yes Harald said this, in case you missed it first time. "Too high a current through the load will drop the voltage due to the internal resistance of the battery or the limited current drive capability of the opamp, respectively."
  17. Arouse1973

    Lost amateur :)

    I agree with Dave, because slightly weather proof could be the failure of the product. I assume in the woods is outside and will be open to all conditions. I have used many speed controllers when I used to race RC cars and fly helicopters. And yes John some come in heat shrink but I must admit...
  18. Arouse1973

    Counter

    I guess so, otherwise how would you tell which bit didn't trigger?. You still have to look at the data sheet and make sure it will work for your situation. Adam
  19. Arouse1973

    Lost amateur :)

    I think the battery and the sounder are going to be the main issue. You may have to go for a flat lithium ion battery. http://www.seeedstudio.com/depot/Lithium-Ion-polymer-Battery-2A-p-603.html And sounders like these, but you may need to step the voltage up with a boost convertor...
  20. Arouse1973

    Lost amateur :)

    Yep Agree Dave
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