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  1. Arouse1973

    Operational Amplifiers

    We can help but we won't do it for you. Tell us what you understand and what have you tried. Do this for all your posts. Adam
  2. Arouse1973

    Voltage Mofset Capacitor

    You missed something from your post. "Hi I am Vasimavr and I was wondering if you could help me do my homework" " Thanks for your help" "Vasimavr"
  3. Arouse1973

    Transistor Saturation

    You missed something from your post. "Hi I am Vasimavr and I was wondering if you could help me do my homework" " Thanks for your help" "Vasimavr"
  4. Arouse1973

    Operational Amplifiers

    You missed something from your post. "Hi I am Vasimavr and I was wondering if you could help me do my homework" " Thanks for your help" "Vasimavr"
  5. Arouse1973

    simple projects ?

    And a battery :)
  6. Arouse1973

    what is this Circuit ?

    That's because it's been drawn as a sort of T network to confuse everyone when really it's a poor voltage reference with an output resistance of 157K. Yes the input might go the other side of the resistor but it's not suppose to be the input of the opamp at all. Adam
  7. Arouse1973

    simple projects ?

    What about an LED flasher circuit? Adam
  8. Arouse1973

    simple projects ?

    Get a few capacitors low value ceramics and a few electrolytics. Adam
  9. Arouse1973

    simple projects ?

    With only those components what about an LED that turns on in the light and off in the dark. What are the other basic things? Do you have any transistors? Adam
  10. Arouse1973

    Unknown nature of waveform

    Maybe the output pin of micro is open collector or open drain? The scope probe is supplying the pull up needed for the port pin to work. If it is then you need a pull up resistor on the micro pin. Adam
  11. Arouse1973

    Can you help me with this project?

    I found this, but it doesn't have a timer. This is the sort of thing I think Colin was talking about. http://www.airyear.com/jtron-03100300m-diy-infrared-remote-control-receiver-black-p-140507.html?zenid=4d11aedee4807e9305103a7f4c94eef5 This should give you a start. Adam
  12. Arouse1973

    Common Base RF amp - CE feedback capacitor?

    This looks like a common base Colpitts and the 39pF is what provides the positive feedback for oscillation. The value, um well probably a formula somewhere I'll see if I can find one. But I guess as long as you made it say 50-100 times lower impedance than the base terminal so it can turn the...
  13. Arouse1973

    When is 1 watt not 1 watt?

    Well Laplace, this is how I do it also. And if I ever have to explain to anyone why I do it that way, I am going to steel those word you just wrote as I can't think of a better way to explain it. Nice one Adam
  14. Arouse1973

    When is 1 watt not 1 watt?

    Oh ok
  15. Arouse1973

    When is 1 watt not 1 watt?

    Oh sorry, just the question actually asked lowest, I wonder why Laplace said highest? Adam
  16. Arouse1973

    Effect of parasit capacitor at the input of my digital circuit

    A small capacitor on the input of the control lines will probably not cause you an issue because the invertors should be at a defined logic level. unless you have any of the inputs floating which could cause the gate to either switch when it shouldn't or the input float into no mans land causing...
  17. Arouse1973

    When is 1 watt not 1 watt?

    The resistor are all in Parallel, in the last part of this question. Adam
  18. Arouse1973

    Can you help me with this project?

    Let me have a look later for you. Do you really want to build something or would you prefer to buy something. Adam
  19. Arouse1973

    Effect of parasit capacitor at the input of my digital circuit

    All this for a touch sensor? Can you explain what all that's doing to save time and what all the control pins do, so we have an idea of how this works. Are the sensors in pairs or is it one T1 and GND T2 and GND etc.... Adam
  20. Arouse1973

    Can you help me with this project?

    A simple IR transmitter and receiver could be made and a simple latch circuit for the LED light. You could even have a timer that turned the light off after a time delay. Adam
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