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...
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.
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...
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...
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...