Search results

  1. mphotis

    digital Compass Chipset???

    Hi everyone, i am in desperate need of finding a 3- axis digital compass chipset. can anyone recommend the name of one such chipset BESIDES any product from Honeywell..... or even a 2-axis and 1-axis that i can combine. any help would be appreciated thanx
  2. mphotis

    light sensor help please

    hey guys, i got a problem... can someone give me a VERY simple circuit that allows me to switch a bp103 phototransistor on when it senses light from a standard red LED. the phototransistor is gonna be kept in a dark box with the led.when the led is off the output from the phototransistor will be...
  3. mphotis

    Bias temperature sensor?

    Can anyone please tell me how to bias an lm35 temperature sensor to work in the range of -10 to +50 celsius? Thanx
  4. mphotis

    simple timer circuit

    Hi there i need help with a new project of mine. i need to design a timing circuit using a 555 timer. it requires that the timer gives a signal out for a specified time. once this time has elapsed, the signal must go to 0V. all i really want to know is, how do i control the timing period of...
  5. mphotis

    earth leakage protection

    Does anyone have any designs for a simple earth leakage sensing and protection device? would be appreciated thanx mike
  6. mphotis

    switching circuit

    Hi there... I really need help. I am busy designing a battery charger using a microcontroller. i need help with the attached circuit. When the battery is full i would like to be able to charge it using a far lower current. Im doing this using a simple circuit using two resistors in parralel...
  7. mphotis

    temp sensor cooling system

    Hi there, ive been assigned a very interesting project. I need to design a cooling system for a go-cart using CO2 cooling. Im thinking of using an LM355 temp sensor to sense the temperature on the motor. when the temperature on the motor reaches a certain threshold level, i want a...
  8. mphotis

    environmental test chambers

    Hi there, Im doing a research project regarding testing a system in a controlled environment. I am using an environmental test chamber. I dont know how the thing works? Has anyone got any information regarding this. Any Datasheets, manuals or anything explaining to me how the thing works...
  9. mphotis

    5 volt regulated power supply HELP!!!!

    Hi there, im not very good at this sort of thing but im trying to get better. im in desperate need of a design for a 5 volt regulated power supply. THe trick is that the design should not involve a 5 volt regulator chip. The regulator has to be built from discreet components. Im using a...
  10. mphotis

    555 timer help

    ??? please help me!!! Im in desperate need of a design for a clock/timer. MY project requires that i design and build a circuit that will act as a stopwatch and a countdown timer. eg, when activated, the circuit must count up in seconds. it can then be reset. it must also have the ability to...
Top