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    Protel DXP PCB Question

    Rules posted by trigger help a lot indeed but it's the practice that makes man perfect. so keep changing the layout and take brakes wen you get bored. :) Don't be afred of freqquent changing the layout more time you put into this now less time you will have to spend later
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    Computer Project - Grounding Question

    You should not connect signal ground to the chassis for a mains connected equipment. There is a seperate Earthing lead in mains supply for it. Just design your PCB right & you won't have trouble of interferance unless you are in industrial envoryment.
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    call timer for mobile phones

    I found this while searching might be helpful http://www.techlib.com/electronics/cellhelp.htm
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    TTL 74AS IC

    if u want really small quantity (5-6 pcs.) u can order samples from TI itself! U can expect them delivered within a week! ;)
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    Help me about a PC Osciloscope

    You have to build an attenuator for scaling the input signal. Even then your bandwidth wil be limited to about 20KHz (i.e. AF range). If that is not sufficient, then you have to use a fast ADC with FIFO to store the samples then use Serial/Parallel/USB port to upload data to PC & write a...
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    pwm in simulik

    I think u can not write a transfer function for a PWM block. But u can create one easily. Create a counter which runs perpetually. (In the diagram i have not limited it's output but it is essential or u will get very large pulse width ;) )Then compare it's output with incoming signal thats all!
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    College textbook question

    Q = C * V thus, V = Q / C = 1u / 1u = 1 V & According to Mr. Ohm I in resistor = 1 / 10 = 100mA
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