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    Led display Digital Voltmeter question

    Dear Lupe, Can you elaborate,why the refrence was not proper using 9 V battery? I want to use this voltmeter as car dashboard meter, In such case the battery voltage will be coverted to +5 V using a 7805 regulator and -5V using IC7660. Hence the ground of the power supply and voltage to be...
  2. V

    Led display Digital Voltmeter question

    You may go through the following web link this will help you to select the correct resistor : http://www.kitsrus.com/pdf/k61.pdf if you have finished the project, can you share your experience, I want to construct this as a dashboard meter for my car.
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    Led display Digital Voltmeter question

    Would you pls suggest the capacitor and resistor types for the project? Thanks
  4. V

    Led display Digital Voltmeter question

    One may be last question before I start construction: the capacitors in the circuit have to be ceramic or other types may also be used.
  5. V

    Led display Digital Voltmeter question

    Thanks for clarification, can you suggest what capacitor value to be used to supress the alternator noise? Since I shall be meauring battery voltage can I eliminate the -ve voltage and leave the IC7107 pin unconnected? I will put a diode in the supply line to avoid wrong polarity apllied to IC...
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    Led display Digital Voltmeter question

    Thanks for reply, I have decided to use IC555 to generate -5V as it is cheap and easily available, In such case should I take +5 V from  output  of    7805    to  make  -5V OR it is better to generate -12V with IC555 and then regualte it to -5 V  using 7905? Will -ve terminal of battery be...
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    Led display Digital Voltmeter question

    I have gone through all the 19 pages on board but still some questions remained to be answered: I want to use this VM to measure car battery voltage, what should be the ground point in this case? This has been asked earlier also but no replies. If I use the car battery (12V) as input to 7805...
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    LED Display Digital voltmeter

    I want to construct this voltmeter as a car dashboard
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