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    Comm. Project

    Gudday people, Please i need ur help/idea on hw i can implement a communication project. I want an app on phone to wirelessly light up an several LEDs independent of each other(one at a time). If dis kind of project has already being done before den can you point me in d ryt direction(link)...
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    How to Interface an ultrasonic sensor and a bluetooth

    Good day everyone, please can anyone tell me or give me an idea on how to interface an ultrasonic sensor with a usb bluetooth adapter? Also mention the possibility.
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    Time delay Circuit-How?

    Please does anyone have any idea on where and how to get a time delay circuit that comes on every 8hours, remain on for about a minute then go off again, and continues the cycle. Also is is possible to use a PIC for such an operation
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    Region of Operation of BJT

    There are four regions. Forward active when Vbe>0 and Vbc<0, Reverse active when Vbe<0 and Vbc>0, Saturation when Vbe>0 and Vbc>0 and Cutoff when Vbe<0 adn Vbc<0.The above is for NPN. The question is a PNP BJT with Veb=0v and Vcb=-3v. The problem is non of the values Vbe's above a definite...
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    Region of Operation of BJT

    My lecturer has bn teasing us with this. In what region of operation will a BJT be operating when Vbe=0? i.e the emitter and base are shorted.Thanks 4 ur replies:)
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    3V,7.7mA supply from 12V battery

    Ok. Firstly the Input voltage has been changed to 9v battery. As for the resistor for the LM117. From the data sheet the formular is Vout=1.25(1+R2/R1)Vin. also from the data sheet R1 was set to 240ohm. From my calculations R2=176ohm which when i simulated got less than 3v at the output. But...
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    3V,7.7mA supply from 12V battery

    Gudday. This is work i was able to come up with. Tried two methods. Please feel free to criticize and advise on the circuits attached. Didnt see a 7803 so i used a 7805 and applied voltage divider to get out 3V. Does it make sense?
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    3V,7.7mA supply from 12V battery

    Thanks very much sir. I will take a look at what you both said and give u a reply
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    3V,7.7mA supply from 12V battery

    Goodday, Can anyone give me some ideas on how to design/build a 3V power supply from a 12V battery. The 3V will supply about 7.7mA to a sensor. Thanks for your anticipated replies.:)
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