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Copyright of this circuit belongs to smart kit electronics.
In this page we will use this circuit to discuss for improvements and we will introduce some changes based on original schematic. This is an easy to build, but nevertheless very accurate and useful digital voltmeter. It has been designed as a panel meter and can be used in DC power supplies or anywhere else it is necessary to have an accurate indication of the voltage present.
This IC incorporates in a 40 pin case all the circuitry necessary to convert an analogue signal to digital and can drive a series of four seven segment LED displays directly. The circuits built into the IC are an analogue to digital converter, a comparator, a clock, a decoder and a seven segment LED display driver.
The circuit as it is described here can display any DC voltage in the range of Volts. In order to understand the principle of operation of the circuit it is necessary to explain how the ADC IC works.
This IC has the following very xs7107gp features:. This type of converter is generally preferred over other types as it offers accuracy, simplicity in design and a relative indifference to noise which makes it very reliable.
The operation of the circuit is better understood if it is described in two stages. During the first stage and for a given period the input voltage is integrated, and in the output of the integrator at the end of this period, there is a voltage which is directly proportional to the input voltage. At the end of the preset period the integrator is fed with an internal reference voltage and the output of the circuit is gradually reduced until it reaches the level of the zero reference voltage.
This second phase is known as the negative slope period and its duration depends on the output of the integrator in the first period. As the duration of the first operation is fixed and the length of the second is variable it is possible to compare dataxheet two and this way the input voltage is in fact compared to the internal reference voltage and the result is coded and is send to the display.
All this sounds quite easy but it is in fact a series of very complex operations which are all made by the ADC IC with the help of a datazheet external components which are used to configure the circuit for the job. In detail the circuit works as follows. The voltage to be measured is applied across points 1 and 2 of the circuit and through the circuit R3, R4 and C4 is finally applied to pins 30 and 31 of the IC.
These are the input of the IC as you can see from its diagram.
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The resistor R1 together with C1 are used to set the frequency of the internal oscillator clock which is set at about 48 Hz. At this clock rate there are about three different readings per second. The capacitor C2 which is connected between pins 33 and 34 of the IC has been selected to compensate for the error caused by the internal reference voltage and also keeps the display cs7107fp.
The capacitor C3 and the resistor R5 are together the circuit that does the integration of the input voltage and at the same time prevent any division of the input voltage making the circuit faster and more reliable as the possibility of error is greatly reduced. The capacitor C5 forces the instrument to display zero when there is no voltage at its input. The resistor R2 together with P1 are used to adjust the instrument during set-up so that it displays zero when the input is zero.
The resistor R6 controls the current that is allowed to flow through the displays so that there is sufficient brightness with out damaging them. First of all let us consider a few basics in building electronic circuits on a printed circuit board.
The board is made of a thin insulating material clad with a thin layer of conductive copper that is shaped in such a way as to form the necessary conductors between the various components of the circuit. The use of a properly designed printed circuit board is very desirable as it speeds construction up considerably and reduces the possibility of making errors. To protect the board during storage from oxidation and assure it gets to you in perfect condition the copper is tinned during manufacturing and covered with a special varnish that protects it from getting oxidised and also makes soldering easier.
Soldering the components to the board is the only way to build your circuit and from the way you do it depends greatly your success or failure.
CSGP Datasheet, PDF – Alldatasheet
This work is not very difficult and if you stick to a few rules you should have no problems. The soldering iron that datasheft use must be light and its power should not exceed the 25 Watts.
The tip should be fine and must be kept clean at all times. For this purpose come very handy specially made sponges that are kept wet and from time to time you can wipe the hot tip on them to remove all the residues that tend to accumulate on it. DO NOT file or sandpaper a dirty or worn out tip. If the tip cannot be cleaned, replace it. Datashedt are many different types of solder in the market and you should choose a good quality one that contains the necessary flux in its core, to assure a perfect joint every time.
DO NOT use soldering flux apart from that fatasheet is already included in your solder. Too much flux can cause many problems and is one of the main causes of circuit malfunction. If nevertheless you have to use extra flux, as it is the case when you have to tin copper wires, clean it very thoroughly after you finish your work.
In order to solder a component correctly you should do the following:. It is written that R1 and C1 se the frequency to 48hz but it is wrong. I have gone through tha data sheet of ic there is 48k hz. You will need a power supply like this: To find out the correct PCB dimensions you have to print it some times at different scales and try to fit the IC on the print.
Admin i build this project together with your ct power supply but i have a little problem. Can the wise men in electronics guide me to any schematic, showing how to connect this display or any other to a zero to 30 v current limiting power supply I built recently. Will be very grateful. Do not have much experience. You will need to add an additional voltage divider to scale the Vdc to 2Vdc and be sure to use high value resistors to limit the current consumption on the resistor divider.
Hi, I have assembled all the parts as per the diagram. However, the unit display constantly displays random numbers. When the circuit is connected to a power source, the display is unstable. Can anyone help me please? Sir is it necessary to use MAN led display or I can use any common anode single digit display. On some applications negative supply can be omitted. So you need a symmetrical power supply like the one here: Yes, you can use ICL The difference with is that has a hold pin to enable LED display freeze function.
Hi I would like to measure the output voltage in mV range, and my input voltage will be given by the Piezoelectric diodes pressure sensor. Will this board will work to measure the voltage out of it?
CS7107GP Datasheet PDF
On the datasheet page 4 you can see the configuration for mV full scale. This is discussed here: This site uses Akismet to reduce spam. Learn how your comment data is processed.
Led display digital Voltmeter http: Parts list added above. Thanks for letting me know 3 years ago. Its the trimmer potentiometer for calibration! How would you supply -5v to the IC? C7 and C6 are nF filter capacitors not shown in schematic 3 years ago. Please double check connections and input voltage ripple. You may also add a bigger filter cap. Try to adjust P1 when there is no voltage input so it displays zero on 7-segment displays. Please double check your datsaheet and part alignment.
Sir is it necessary to use MAN led display or I can use any common anode single digit display 2 years ago. You can use any common anode display. I am confusing about the supply voltage for this project.
The voltage at pins is DC only. If yes, what changes should I apply? Can I measure AC voltage with this, pls help 3 months ago. Leave a Reply Cancel reply.