ante Posted September 7, 2004 Report Share Posted September 7, 2004 mahalkoh,Welcome to this forum.Here is the datasheet for ICL7106: http://www.intersil.com/data/fn/fn3082.pdf Quote Link to comment Share on other sites More sharing options...
charliecuattro Posted September 8, 2004 Report Share Posted September 8, 2004 thanks MPa isolated dc-dc converter might work??somebody can helpme with a low cost circuit dc-dc isolated??i edit the board file from eagle and added:on-off-on swchgrid ac ledinverter ledthe bridge for ac readingsbecouse dc-ac inverters usually have big battery banks , will be nice to power itself the voltmeter.as soon i finish i will post here thanks Quote Link to comment Share on other sites More sharing options...
MP Posted September 8, 2004 Report Share Posted September 8, 2004 Charlie,I am having a problem envisioning what you mean. If your power source and your measured voltage will not interact with each other, the circuit will work. Otherwise, there is a problem. Can you post what you propose for comments?MP Quote Link to comment Share on other sites More sharing options...
charliecuattro Posted September 8, 2004 Report Share Posted September 8, 2004 hi, i have a dc-ac inverter 3kw 110v from 12v battery bank.i would like to monitor the battery voltage, but i dont want to use 9valkaline battery nor 110ac power supply for power the voltmeter.becouse i can not feed the vmeter from same source i'm monitoring,i want to use a circuit to be able to do that , a dc-dc converter or any suggestions.9v do not last enough for always on situation.thanks :) Quote Link to comment Share on other sites More sharing options...
Dido Posted September 8, 2004 Report Share Posted September 8, 2004 I`m planing to do this project I read your discusses ::) and even now I can`t understand if the PCB given here in the article is OK I hope so beause I`ve already etched it. Quote Link to comment Share on other sites More sharing options...
ante Posted September 8, 2004 Report Share Posted September 8, 2004 Charlie,You have to use a DC-DC step down circuit with isolation transformer. Quote Link to comment Share on other sites More sharing options...
MP Posted September 9, 2004 Report Share Posted September 9, 2004 Dido,The final discussion was in the feedback area. I will ask mixos to move it over to this one so that they are easier to find.In the mean time, I recommend you look at the posts. I posted a pcb layout in eagle format in that forum.MP Quote Link to comment Share on other sites More sharing options...
charliecuattro Posted September 9, 2004 Report Share Posted September 9, 2004 hi, i already contacted www.beta-dyne.com who make a 9v to 5v dc converter 2watts , 400 ma isolated and they are on their way .As soon i have them i will post results and my modified board layout.becouse mostly dc-ac inverters use 12v or 24 v configurations, i will use 9v to 5v beocuse at 9 v the dvm will work besides the inverter who stop working at 10.7 v. i will feed the dc-dc from lm317 to220 1.5 amp variable regulator at 9.2 volts , so does not matter if is 12v or 24 volts battery bank .this is important becouse i built dc ac inverter up tp 10kw for 110 or 220 vac , and that will be a nice feature Quote Link to comment Share on other sites More sharing options...
Guest Kasamiko Posted October 29, 2004 Report Share Posted October 29, 2004 I've successfully constructed this project and set the range to 20VDC by using a 100k input resistor..I connected it to my power supply LM317 but notice that my last digit wont lock, let say i'll set the voltage output to 3.6 vdc, my display says 3.61, 3.63, 3.65....dirty pots? Quote Link to comment Share on other sites More sharing options...
audioguru Posted October 29, 2004 Report Share Posted October 29, 2004 Hi Rhonn,You are trusting the stability of your components:1) How much do the values of you project's and your LM317's resistors change as they warm up?2) How much does the voltage references in the IC for this project or in your LM317 change as they warm up?Your IC for this project is driving many LEDs so will not remain cold.My purchased digital meters are stable maybe because their IC is driving a very low current LCD display, and/or maybe because their manufacturers used very stable 1% or better metal-film resistors.Most meters are calibrated after a long warm up period. See if yours becomes stable after both it and your LM317 have been turned-on for about 1/2 hour. Quote Link to comment Share on other sites More sharing options...
duhaas88 Posted November 12, 2004 Report Share Posted November 12, 2004 I have been reading these posts, and I must say there are some very bright individuals in here:) anyways, I would like to use this cIrcuit to measure the voltage of a power supply output, however it is 0-25.2 VAC not DC, is there a mod I can implement that will allow this?? I will use a separate power supply for the + and - 5v. I saw in the spec sheet in figure 21 that a AC to DC convertor with the ICL7106 can be used?? Can i simply implement that circuit??I'm a newbie at this stuff, so please forgive my ignorance!!! Quote Link to comment Share on other sites More sharing options...
ante Posted November 12, 2004 Report Share Posted November 12, 2004 You need an instrument rectifier. Quote Link to comment Share on other sites More sharing options...
duhaas88 Posted November 12, 2004 Report Share Posted November 12, 2004 You need an instrument rectifier.Ante,Was this in response to my questions??Can you be more specific?? Is this a costly solution? Hard to implement? LIke I said before I"m a newbie:)Duhaas88 Quote Link to comment Share on other sites More sharing options...
MP Posted November 13, 2004 Report Share Posted November 13, 2004 Look for the thread on the digital voltmeter corrections. A schematic was posted showing how to convert it to AC/DC input. It was posted here: http://www.electronics-lab.com/forum/index.php?board=13;action=display;threadid=1516MP Quote Link to comment Share on other sites More sharing options...
ante Posted November 13, 2004 Report Share Posted November 13, 2004 This is an instrument rectifier. It Quote Link to comment Share on other sites More sharing options...
audioguru Posted November 13, 2004 Report Share Posted November 13, 2004 Hi Ante,Your full-wave rectifier circuit works fine at low frequencies, I have used it many times. Its "full-wave" becomes assymetrical above about 2KHz, unless you use a wide bandwidth opamp like a TL074, which rectifies well up to about 25KHz in this circuit.The TL074 has FET inputs so RV2 is unecessary (input pin 10 connects directly to ground), but an offset voltage adjustment is needed with any opamp for very low-level inputs. Quote Link to comment Share on other sites More sharing options...
ante Posted November 13, 2004 Report Share Posted November 13, 2004 Hi Audioguru,Well, since the girl wants to measure the output voltage from a power supply I think it Quote Link to comment Share on other sites More sharing options...
Zwieke Posted November 26, 2004 Report Share Posted November 26, 2004 Just to be sure:If I change the circuit to the one I've attached It would measure Current instead of Voltage right?Edit: I need it to measure 0-3A Quote Link to comment Share on other sites More sharing options...
Zwieke Posted November 29, 2004 Report Share Posted November 29, 2004 anyone? Quote Link to comment Share on other sites More sharing options...
burr1 Posted December 9, 2004 Report Share Posted December 9, 2004 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 Quote Link to comment Share on other sites More sharing options...
MP Posted December 10, 2004 Report Share Posted December 10, 2004 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 Quote Link to comment Share on other sites More sharing options...
burr1 Posted December 10, 2004 Report Share Posted December 10, 2004 Thanks :D Quote Link to comment Share on other sites More sharing options...
WS6Extreme Posted December 29, 2004 Report Share Posted December 29, 2004 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????thanksThanks 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 Quote Link to comment Share on other sites More sharing options...
jemo Posted January 12, 2005 Report Share Posted January 12, 2005 hey. how can i measure a range 0- 360m V. i will be using for my angle meter. Quote Link to comment Share on other sites More sharing options...
JAYAN Posted January 27, 2005 Report Share Posted January 27, 2005 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. Quote Link to comment Share on other sites More sharing options...
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