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bilalhasani

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  1. hi to everybody here i am a new comer here with my 1st post, and i am really impressed to see the way you people are working for projects and discussing about them for the benefit of beginners like me. i saw the LED display voltmeter and also browsed through the discussion about it, and i think its an ideal project for any beginner to start. but i have some questions about it before its practical implementation (dont laugh if you find them too childish) First Question: for multi range, its recommened to use 0 ohm for 0-2 volts, 120 k ohm for 0-20, 12 k ohm for 0-200, and 1.2 k ohm for 0-2000. i cant understand why no resistance for 2 volt, then suddenly increases 120 k for 20 V, then it gradually decrease for 200 and 200 V. I have always seen resistances increasing or decreasing in any multi range meter (current, voltage etc). but here it is showing different change ???? Second Question: what about type of capacitors used? in diagram, they seem to be non polar but i want to confirm about their type. also voltage ratings of capacitors is not mentioned??? Third Question: from the discription of circuit, it is clear that the IC 7107 is very delicate, what does it mean?? will the voltmeter be also very delicate that it may damage for a very small excessive voltage... So please make me clear about the tolerance level about which it can withstand. thank you very much for reading all this stuff written by me... waiting for a kind reply bilal
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