Gusk4x4 Posted May 31, 2004 Report Share Posted May 31, 2004 Hi all,Where can I get the "EXACT" PCB pattern layout for this project? I tried to used the layout in this post but everytime I print it out it's always oversized.. I set my printer to 1:1 but to no avail..It is written in the article that you must set your printing software to resize the layout to 35% of the original size, or use the dimensions in milimeters that are under the picture on the article.It works perfectly.Regards Quote Link to comment Share on other sites More sharing options...
Gonzakpo Posted June 6, 2004 Report Share Posted June 6, 2004 Hello...Before starting to do this circuit There´s something i must know!!I want to place this circuit in a power suply which goes from 0 to 20V......and i was wondering if it this circuit displays the voltage with two decimals or only one.....(when you are using the R3 for measure from 0 to 20 v obviously)......I hope it uses two decimals because if not I will have to find anotehr circuit....I imagine you already notice that my english is terrible....that's because 0m from Argentina.....so.....sorry for my english...Thanks....Chau!!..Saludos desde Argentina Quote Link to comment Share on other sites More sharing options...
Gusk4x4 Posted June 6, 2004 Report Share Posted June 6, 2004 Hello...Before starting to do this circuit There´s something i must know!!I want to place this circuit in a power suply which goes from 0 to 20V......and i was wondering if it this circuit displays the voltage with two decimals or only one.....(when you are using the R3 for measure from 0 to 20 v obviously)......I hope it uses two decimals because if not I will have to find anotehr circuit....I imagine you already notice that my english is terrible....that's because 0m from Argentina.....so.....sorry for my english...Thanks....Chau!!..Saludos desde ArgentinaHello, i´m from Brazil.When measuring from 0-20V, this circuit displays 2 decimals.Regards Quote Link to comment Share on other sites More sharing options...
Gonzakpo Posted June 6, 2004 Report Share Posted June 6, 2004 Ok thanks.........I won't say anything about the footbal match..Chauuu Quote Link to comment Share on other sites More sharing options...
Gonzakpo Posted June 8, 2004 Report Share Posted June 8, 2004 Hi......I'm here again........with more doubts :-\First of all i would very happy if another person corrovorates if this circuit displays two decimal when measurin from 0 to 20.And my other question is: Which R1 should i use!!!?? 180K or 100K (in the datasheet and in the eagle circuit says 100k but I'm not sure what to do!!!)Is there another correction in the values of the resistors or the capacitors???Thank you very much.......I will be waiting for your answer (I want opinions!!!) Quote Link to comment Share on other sites More sharing options...
Gonzakpo Posted June 8, 2004 Report Share Posted June 8, 2004 Sorry....i forgot to say something........in the pcb all the pin 5 of the MAN6760 (which is the pin of the dot in the display) are send to ground!!!.........IN THAT CORRECT!!!??? (i don't think so)...OK that's all.....thanks again........ Quote Link to comment Share on other sites More sharing options...
wired Posted June 10, 2004 Report Share Posted June 10, 2004 In browsing this forum, I believe I have seen corrections posted for this circuit. Some were in the "General" area. I do not recall where but there were two different places that it was discussed. Perhaps a search could help you. Quote Link to comment Share on other sites More sharing options...
metal Posted June 16, 2004 Report Share Posted June 16, 2004 HelloI just wantes to know what is the purpose of REF HI and REF LO pins, also does the above schematic has a 2.000 volt full scale or not .In AN023 application note, it is said that to obtain 2.000 volt full scale, pin 29 cap must be 47nF, pin 28 resistor must be 470 K, and pin 27 cap must be 220nF. Is that right. I noticed that you done the opposite.Thanks Quote Link to comment Share on other sites More sharing options...
maestrodamuz Posted June 19, 2004 Report Share Posted June 19, 2004 I have done enuff research to confirm that it works the way it is in the schematic. I have carried it out and the DVM worked to an accuracy of 98%. Don't worry it will work. ;) Quote Link to comment Share on other sites More sharing options...
benz Posted June 28, 2004 Report Share Posted June 28, 2004 I am building the same circuit as discussed earliers. I want to attach the meter to a supply and measure the same supply. I find its not possible as the ground and the common is not same. I am attaching the circuit to a 12V supply using a 5V regulater. then monitor the same 12 V supply. How can I do this? Thank you for your help. Quote Link to comment Share on other sites More sharing options...
MP Posted June 28, 2004 Report Share Posted June 28, 2004 Benz, you cannot power any digital voltmeter from the supply you are measuring. You have to provide an unchanging supply voltage to the meter. There are a few ways to do this. Primarily, you will want to pull the supply off the secondary side of the transformer somewhere and not from the variable output. You can do this in many cases by just adding another regulator, etc.MP Quote Link to comment Share on other sites More sharing options...
Guest Kasamiko Posted June 28, 2004 Report Share Posted June 28, 2004 I just finished mine on a breadboard..but when I powered it, The digits that was displayed was NOT zeroes but random numbers if I try to adjust the trimmer but only the leftmost digit display "1" I check my display segment by connecting PIN# 37 to +5V and all are ok..Did I missed something.. ???Rhonn ;) ;) Quote Link to comment Share on other sites More sharing options...
ante Posted June 28, 2004 Report Share Posted June 28, 2004 Hi Rhonn,Do you know if the schematic you have used is updated, there have been some issues and a couple of errors if I remember correctly?Ante ::) Quote Link to comment Share on other sites More sharing options...
Guest Kasamiko Posted July 1, 2004 Report Share Posted July 1, 2004 Hi Ante, can you point me to the tested and working schematic for this project. I got a lot a ICL7107 sample chip from Maxim and Intersil and I'm planning to build a regulated power supply with digital readout for voltage and current respectively..Maybe this circuit will do the job.http://www.electronics-lab.com/projects/power/032/index.htmlRegards.Rhonn ;) ;) Quote Link to comment Share on other sites More sharing options...
Guest Kasamiko Posted July 1, 2004 Report Share Posted July 1, 2004 I have found this this updated and corrected schematics..But want to clear this out.. Based on the two posted schematics, is PIN #30 connected to PIN #32 and 35 or what??Thanks again..Rhonn ;) ;) Quote Link to comment Share on other sites More sharing options...
ante Posted July 1, 2004 Report Share Posted July 1, 2004 Rhonn,Yes, the REF LO and IN LO shall be connected to COM.Ante ::) Quote Link to comment Share on other sites More sharing options...
Saint Posted July 5, 2004 Report Share Posted July 5, 2004 stuee,Yes, this circuit can measure current if you like. You need a shunt for this.Ante ::)Ante,What would the circuit look like and what value shunt resistor would be needed to enable the meter to measure 30 vdc and 3 AmpsGreg Quote Link to comment Share on other sites More sharing options...
ante Posted July 5, 2004 Report Share Posted July 5, 2004 Greg,Welcome to this community.I assume you are using an analogue meter since you want a 0 Quote Link to comment Share on other sites More sharing options...
audioguru Posted July 5, 2004 Report Share Posted July 5, 2004 Greg,If you are building our "0-30V, 0.002-3A Power Supply", instead of adding a current meter with shunt in series with the load, which spoils the voltage regulation, why not monitor the voltage across its R7, which is already in series with the load and is outside the voltage-regulation loop. R7 will be the meter's shunt, and you just need to divide the voltage across it by 4.7 to get a 3A range. Quote Link to comment Share on other sites More sharing options...
ante Posted July 5, 2004 Report Share Posted July 5, 2004 audioguru,Greg asked Quote Link to comment Share on other sites More sharing options...
Saint Posted July 5, 2004 Report Share Posted July 5, 2004 Greg,Welcome to this community.I assume you are using an analogue meter since you want a 0 Quote Link to comment Share on other sites More sharing options...
ante Posted July 5, 2004 Report Share Posted July 5, 2004 Sorry, I believed it was a mistake curse I don Quote Link to comment Share on other sites More sharing options...
Saint Posted July 5, 2004 Report Share Posted July 5, 2004 Hi Guy'sSorry. I am causing all sorts of confusion here. To clarify....This digital volt meter is a great idea. I will build my own 0-30vdc variable supply at 3 amps. very similar to what you have on your site. However instead of using analogue meters. I would like to build this digital voltmeter into it. I would also like some detailed guidance from you knowlegable gentleman as to how to change the digital meter into a digital ammeter. Your assistance would be greatly appreciated.Greg Quote Link to comment Share on other sites More sharing options...
MP Posted July 5, 2004 Report Share Posted July 5, 2004 This has already been answered here on the site. You just need to search. It was either in the digital voltmeter discussion or it was in the 0-30 Volt Power Supply discussions. I recall seeing a diagram posted to use the digital voltmeter for both volts and amps.If you cannot find it, let us know. MP Quote Link to comment Share on other sites More sharing options...
Saint Posted July 13, 2004 Report Share Posted July 13, 2004 I have found all the info on your site.Thankyou Gents Quote Link to comment Share on other sites More sharing options...
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