Led display Digital Voltmeter question

[burr1]

1) Hi I was wondering WHY C6 and C7 are not in the parts list?

2)Second , the resistor in the front side of PCB is already in the parts list?

Sorry my english i usually speaks spanish.. ;D ;D. Be nice its my first post

 

[MP1]

Zwieke:
I do not think this device will handle the current you are wanting to measure. Please look at the maximum ratings on the data sheet to be sure.

Burr1:
These two capacitors are the power supply bypass caps. There is a wide variety of what will work and it is dependent upon the power supply you use. A good common value that should work in most normal cases is a 10 uf.

MP

 

[burr1]

Thanks

 

[WS6Extreme]

I am looking to do the same project as nice ride....couldn't you just use the same battery that you are measuring with a regulator circuit regulated at 5 volts?

also i need to know how to get the 0-20 volt display scale...
what resistors and capacitances are needed????

thanks

Thanks everyone for the help ahead of time.... I have read everything, and reviewed everything, and I am ready to build this circuit; however has this question been answered?

I basically am building this circuit to measure the voltage of a car battery and would like it to just be a two wire hook up. If I can

 

[jemo]

hey. how can i measure a range 0- 360m V. i will be using for my angle meter.

 

[JAYAN]

can i use any 7-segments anode lcd dislpay ? or i have to use that man6960 'cause i cant find it in my country

Hi, you can use any kind of 7 segments common anode led segments in place MAN 6960 But u have to increase the input power(impere) of +5v and -5v.

 

[MP1]

There are many 7 segment displays which will work. Compare the specs in the data sheet. You will come across two types. Common anode and common cathode. This is the most important difference. Choose the correct one. Also look at the other voltmeter project in the projects section. It uses a dual display. This is the MAN6710. These can usually be found for less than the price of two of the single seven segment displays. Both projects use the "Common Anode" type displays.

MP

 

[sword1]

Hi, wich of schematic is correct? Is that given in forum? And i want to know how does i know what kind of resistors i have to use?

Help please...

 

[MP1]

The discussion regarding the final corrections were in another area. This happens when someone starts a new topic instead of posting in the same thread.
I have merged that discussion into this one. Go back through the pages of this discussion and you will now find all of the information.

MP

 

[ra001]

how one can measure AC voltage with this digital voltmeter?

 

[uniqueastcoast]

can some body send me a clear schematic of the LED pins configuration, showing all the LED pin number connected to the ICL7107.

 

[MP1]

I have merged some of the old Digital Voltmeter conversations found in another area into this thread. Go back to page one and browse through the messages of this thread. You will find the answers to these questions in the past posts.

MP

 

[telcotech]

Will this schematic measure resistance?

Actually, what I am looking for is a schematic for an ohm meter that would measure 10k to 500k in 10k incraments and display it as 1-50, e.g. 10k-19.99k = 1, 20k-29.99=2....you know....

Anyway, if this schematic will not work, anyone have any ideas?

Thanks

View attachment 36557

 

[vinash]

Hi,
i do have queries with regards to the LED display Digital Voltmeter. I am from a mechanical background and do not have much knowledge in electronic devices. I am currenlty trying to build a Led digital voltmeter. I would like to find out whether we have to programme the ICL7107 chip to display the voltage output or just need to buy the chip and connect according to the specifictions given in http://www.electronics-lab.com/projects/test/014/. Is the ICL7107 chip pre-programmed already? Thank you....

 

[Dazza]

Hi vinash,

The ICL7107 doesn't need to be programmed ;D.

Yes, you just need to buy the chip, and have fun putting this project together 8).

 

[babisko]

How can I connect common cathode LEDs instead of common anode LEDs to ICL7107? (cause I have some LEDs common cathode).
Any schematics?

 

[cliffclavin]

Hello!

I would like to monitor the voltage from a sensor. The sensor produces 0 to 10 volts. I would like the display to show the voltage in relation to a scale of 1 to 2000.

eg.
0v = 0
2.5v = 500
5v = 1000
7.5v = 1500
10v = 2000

The digital voltmeter project can be modified to measure a voltage range of 0 to 20 volts by replacing R3 with 120 Kohm 1% res.

(Voltmeter project link)

http://www.electronics-lab.com/projects/test/014/index.html

Now if I took the voltage output ( 0 to 10v ) and put a voltage doubler there to make the sensor output 0 to 20v, and connected this to the input of the modified range voltmeter ( 0v to 20v),

Will the voltmeter display the range I want from the input voltage?

I guess I'd have to disconnect the decimal point LED in the display ( so 12.15v would read 1215 )

Will this do what I want?

Many thanks

ps. There is a long forum discussion about making the voltmeter

http://www.electronics-lab.com/forum/index.php?board=2;action=display;threadid=119;start=1;boardseen=1

This posed a few questions that I couldn't find the answer for. However, it was a long read (10 pages) so could somebody who's built the voltmeter answer :

How stable is the device? Somebody said as the voltmeter 'warms' up, the volt reading changes. Is this true? By how much? Could someone who's built this explain a bit more?

Will the voltmeter (when modified to 0 to 20v range) read to 2 decimal points (eg. 12.51 v ) ?

thanks

 

[contactz]

any1 knows how do i convert the digital o/p to display in 'newton' in the LED display? tks

 

[ronrayzap]

  ??? We implemented this project and wow it works!!! However, the position of the decimal point seems to be incorrect. Two decimal points simultaneously light up. How can we correct this?

 

[smartsarath2003]

Hai,
Can any one explain the function of pins27,28,29 on ICL7107.
Also I still didn't get clue why the pin7, which was said catode-A is shown linked to ground in the main schematic ???. Is it supposed to be pin5(cathode-dp) for required decimal pt.
Also How does the ref-hi(pin36) effects final mesurement. Can i ground it to have all my voltages(at VinHi) measured in reference to 0V.

thanks