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Jackie M

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  • What number is nearest to 10000 that has only two prime factors?

    What number is nearest/closest to 10000 that has only two prime factors?

    1 AnswerMathematics1 decade ago

  • What number is less than 250 and divisible by 24 and 25?

    Is there a number that is less than 250 and divisible by both 24 and 25?

    5 AnswersMathematics1 decade ago

  • what does this circuit mean?

    Hi,

    I'm attempting to connect my arduino Duemilanove to a toy rc car. I'm trying to bypass the radio controller and control the toy car's motor directly using the arduino but opening the car up (looks like this http://yfrog.com/m9pict0132gj ) there is one main circuit board and from there, several cables go to the motor for the rear wheels and front wheels. What I'm trying to figure out now is what these cables do. I've gotten a multimeter and have isolated how to make the back wheels turn using the arduino since its only 2 cables but the front one has 8. Some of the these cable pairs seem to turn "on" when the front wheels turn left or right. Is there any way to figure out what all these cables do? I've tried to look for the schematic (looks like this http://yfrog.com/mvpict0134ij ) but I can't seem to find any. Does this look familiar to anyone?

    1 AnswerEngineering1 decade ago

  • Dual H-bridge IC selection?

    Hi,

    I have a DC motor that runs at 3V,150 mA (20 Ohm) and I was wondering what Dual H-bridge IC would be suitable for this? I was looking at L293D H-Bridge but it doesnt seem to be able to give the proper power. Any ideas?

    1 AnswerEngineering1 decade ago

  • several electronic questions (schematics and calculations)?

    Hi,

    I have 2 D-cell batteries. How many V and A does it produce?

    I have a circuit (from a robot toy) that looks something like this:

    http://aug18.imghost.us/7xVa.jpg (the one in the box labeled A).

    The circuit can switch between the three states (as can be seen in boxes labeled A,B and C). The circuit is powered by 2 D-cell batteries and powers a simple motor.

    What I want to do now is: I have 2 wires, each are either off or on. When they are on, they produce 5V and 40mA each. I want to modify the switches (labeled in X,Y,Z) and the switches only that when one of the wire is on and the other is off, the circuit becomes in the B-state and if one of the wire is off and the other is on, the circuit becomes the C-state. And when both wires are off or both of them are on, the circuit becomes the A-state. How do I do this and what do I need to do this? What components do I need? Im really bad at calculating and designing electrical circuits.

    Can anyone help?

    Thanks!

    1 AnswerEngineering1 decade ago