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  1. Arouse1973

    Driving a led from high-voltage source

    Hello Peter Being AC you could possibly use a sense coil to pick up the signal from the cable. A small inductor wrapped around the wires might work. Adam
  2. Arouse1973

    HUH?????

    Lol Lol, what a laugh, he is very convincing, but I dont think I will be trying this. Adam
  3. Arouse1973

    Super long standby VOX/transponder help needed.

    All you need to do is build a little circuit that switches on the beacon device every so often. How long would you want to wait between beacon pulses?
  4. Arouse1973

    Super long standby VOX/transponder help needed.

    I assume you want this to be able to find the balloon when it has landed? You want some kind of RF beacon. I am thinking maybe a http://en.wikipedia.org/wiki/Avalanche_transceiver Thanks Adam
  5. Arouse1973

    Suitable material to filter UV out of halogen lamp

    What type of UV?
  6. Arouse1973

    Trying to understand a low voltage warning circuit

    Diodes are different to resistor in the fact that diodes are non linear and resistors are linear devices. Diodes have a dynamic resistance which changes with current. If you try to work out the resistance of the diode by using V/I then the answer you get will be way off, maybe 10 times. If you...
  7. Arouse1973

    Audio Amplifier Design

    Here is a simple amplifier circuit. The input is 200 mV sine wave @ 1KHz. The output is approx. 10 V Pk-Pk into an 8 Ohm load. See if you can see what might be wrong with yours. This amplifier is not ideal but I have tried to keep it as close to what you have done. Adam
  8. Arouse1973

    Motors

    Your welcome Sir
  9. Arouse1973

    Motors

    Saying that....... These are £3.65 each http://www.servoshop.co.uk/index.php?pid=EMAXES08AII&area=Servo
  10. Arouse1973

    Motors

    Here is some info about modifying them. It's quite easy. Also a link to a supplier. This will give you an idea of the specs and what they look like. You can then try and find some cheaper ones. Thanks Adam http://www.servoshop.co.uk/
  11. Arouse1973

    Does any one know an inverter chip that uses 12V DC to make a signal with variable freq and Voltage?

    I don't know of an IC that will do all of this but I would look at sine wave output voltage to frequency converters if you can find one. Or a triangle wave generator put into a Trigonometric function generator to convert the triangle wave into a sine wave. But you are going to need some current...
  12. Arouse1973

    Motors

    An easy option would be to modify some small RC servos. They have fixings for the body and a screw hole for different types of horns, one being circular with holes in them, so you could connect this to a wheel. Adam
  13. Arouse1973

    Does any one know an inverter chip that uses 12V DC to make a signal with variable freq and Voltage?

    What is voltage V?
  14. Arouse1973

    Does any one know an inverter chip that uses 12V DC to make a signal with variable freq and Voltage?

    Hello Can you be a bit more specific? What are you trying to do? Is 1 - 12 Volts the input or output, is 1W the total power of the circuit or the load requirements. is the output going to be a sine wave or something else. Tell us more about what your trying to do. Adam
  15. Arouse1973

    Motors

    Hello Sir :) How fast do they have to go, and are you going to use any gearing? What is the working voltage and supply current available. What space do you have? Thanks Adam
  16. Arouse1973

    hospital yet again

    Hope your Ok Dave. Adam
  17. Arouse1973

    Audio Amplifier Design

    You can't change the frequency buy adjusting the volume. Adam
  18. Arouse1973

    Trying to understand a low voltage warning circuit

    The current in the LEDs when the active zener is on is so low it's not worth worrying about. To work out the resistor value for the LED, You have to look at the datasheet for the LED and choose a current that is anywhere up to the maximum operating current for the LED. You then can work out your...
  19. Arouse1973

    Trying to understand a low voltage warning circuit

    When the active zener is on it hogs all but a very very small amount of the current from the LEDs. It's like placing a low value resistor across the LEDs. Thanks Adam
  20. Arouse1973

    interactive rainbow led

    What do you mean the last given variable? Adam
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