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Volt Meters Circuits
Last Updated on: Saturday, August 30, 2014 10:28 AM


Links to electronic circuits, electronic schematics, designs for engineers, hobbyists, students & inventors:

3 Digits Digital Volt Meter with PIC16F676 -  This is simple 3-digits digital volt meter.PIC16F676 used to read analog signal(voltage) and display the value on 3-digits 7-segment. You can apply similar principles to measure DC current with parallel R shunt. …....
3-Digit DVM Voltmeter -  Uses 3161, CA3162 ICs ….(design added 11/08)
3-Digit Volt/ Amper Meter -  Even if the digital multimeters have dominated in a lot of applications, in the measurement, exist the need for existence of instruments of clue in various appliances, voltage and current, as in power supply or elsewhere. The circuits that give make this precisely the work, measure the voltage in terminal a circuit and the current that passes in his. The circuit does not present particular difficulties for somebody that has a small experience. The two circuits are the himself, with a small difference only in their input, when they have they measure voltage or current and in connection that concern decimal point. …....
AC Voltmeters & ammeters -  Electronic Circuit design (added 02/05)
AN557: Four Channel Digital Voltmeter with Display & Keyboard -  Microchip Application Note Published 27-May-05  (app note added 2/06)

Analog Milliamp Meter Used as Voltmeter -  A milliamp meter can be used as a volt meter by adding a series resistance. The resistance needed is the full scale voltage reading divided by the full scale current of the meter movement. So, if you have a 1 milliamp meter and you want to read 0-10 volts you will need a total resistance of 10/.001 = 10K ohms. The meter movement itself will have a small resistance.... [Bill Bowdewn's site]
AVR Digital Voltmeter -  Most electronics hobbyists these days find a digital voltmeter indispensable. Indeed, having more than one is a positive advantage!This little project with six voltmeters in one inexpensive box therefore has some very useful features for the hobbyist. The unit is quite inexpensive, two ICs and a couple of transistors. One of the ICs is an AT90S4433 AVR..(electronic circuit added 4/05)
Digital LED Voltmeter -  Measures voltages up to 199.9V with 0.1V resolution.  (circuit added 8/06) 
Digital Mains Voltage Indicator -  ....
Digital Volt & Amp Meter with Temperature Control -  This project was designed and constructed as enhancement to the 0-30V Stabilized Power Supply Project with the DIY electronics hobbyist in mind. The circuit uses a single PIC Microchip to perform the Voltage, Current and Temperature conversions and display functions. The PCB Board uses large …....
Digital voltmeter -  Schematic only, no circuit description
Expanded Scale Battery Volt Meter -  This circuit is used to measure the voltage on a 12V (nominal) lead acid rechargeable battery system. It was specifically designed for use in solar powered systems, but is general enough that it can be used for automotive or other 12V systems. Lead acid batteries normally spend their working lifetime in the voltage range of 11-15 Volts.  This meter circuit....(added 10/05) [G. Forrest Cook]
Expanded Scale Voltmeter -  I have a 12v batter charger I put together many years ago from bits and pieces found in the junk box. Its been a good little light duty charger, but was lacking any form of battery monitoring, so I decided to give it an upgrade with a expanded scale volt meter and amp meter....(Circuit design added 06/10) 
Expanded Scale Voltmeter uses Just Two Parts -  01/20/94 EDN-Design Ideas....The expanded voltmeter doesn't require trimpots to obtain usable accuracy or require the tedious selection of Zener diodes.  This circuit consists of only two parts and a5V meter. The circuit is completely linear and requires no calibration except the rare mechanical zeroing of the meter. By using.... [Design Idea by DD Cantrell, North Valley Research, Los Molinos, CA]
Expanded-scale indicator revisited -  8-Aug-02 Issue of EDN  The visualization aid that a previous Design Idea describes allows only the expansion of the upper end of the scale (Reference 1]. But what can you do if, according to your project requirements, you need to expand the middle region of the scale? Figure 1a illustrates the challenge. A voltmeter comprises a 100-΅A dc meter and a series resistor.... [Design Idea by Abel Raynus, Armatron International Inc, Melrose, MA]
Four Channel Digital Voltmeter with Display & Keyboard -  Microchip Application Note Published 27-May-05  (app note added 2/06)
High Impedance Voltmeter -  This circuit is designed to provide an inexpensive way to to create a High Impedance Voltmeter while making use of an inexpensive analog or digital multimeter. The circuit is specifically designed for testing phototransistors when they are used in the circuits shown at this site. It has a very high input impedance that will not "Load Down" the sensor that is being checked.... [from Rob Paisley's Model Train web site]
High-impedance voltmeter -  An ideal voltmeter has infinite input impedance, meaning that it draws zero current from the circuit under test.  This way, there will be no "impact" on the circuit as the voltage is being measured. The more current a voltmeter draws from the circuit under test, the more the measured voltage will "sag" under the loading effect of the meter, like a tire-pressure gauge....
HOTCHEK -  The HOTCHEK is a compact expanded scale voltmeter designed to check the receiver battery pack. Its very small size makes it great as onboard voltage monitor or it can be used as a "pocket meter," replacing those old fashioned bulky meters. A 0.3A load can be placed across the batteries with a push of a button allowing the true state of the pack to be tested ....
How to Use the MAXQ2000 as a Voltmeter -  Maxim App Note 4194  -- 3/24/2008 --  (app note add 5/08)
ICL7107-DigitAL LED VOLTMETER  -  This digital voltmeter is ideal to use for measuring the output voltage of your DC power supply. It includes a 3.5-digit LED display with a negative voltage indicator. It measures DC voltages from 0 to 199.9V with a resolution of 0.1V. ….(electronic schematic added 11/08)
LB-48: Linear Brief 48 Simple Voltmeter Monitors TTL Supplies -  National Semiconductor Application Note  (app note added 2/06)
LED display Digital Voltmeter -  This digital voltmeter is ideal to use for measuring the output voltage of your DC power supply. It includes a 3.5-digit LED display with a negative voltage indicator. It measures DC voltages from 0 to 199.9V with a resolution of 0.1V. The voltmeter is based on single ICL7107 chip and may be fitted on a small 3cm x 7cm....(electronic design added 6/07)
LED Voltmeter Expanded Scale (ideal for your car) -  Its Useful to see the charge voltage. This Helps in detecting a Bad Alternator before it creates a dead battery....(electronic schematic added 12/08)
Low Power LED Voltmeter -  This is a low power voltmeter circuit that can be used with alternative energy systems that run on 12 and 24 volt batteries. The voltmeter is an expanded scale type that indicates small voltage steps over the 10 to 16 volt range for 12 volt batteries and over the 22 to 32 volt.... [G. Forrest Cook]
Mains Voltage Indicator -  The solidstate voltmeter circuit described here indicates the mains voltage with a resolution that is comparable to that of a general-purpose analogue voltmeter. The status of the mains voltage is available in the form of an LED bar graph....
Microcontroller functions as voltmeter -  10-May-07 Issue of EDN  PIC microcontroller and FETs enable a four-digit voltmeter.... [Design Idea by Noureddine Benabadji, University of Sciences and Technology, Oran, Algeria]
Powerline Voltmeter -  Here’s a rather special voltmeter that will let you measure the AC grid voltage and also see very accurately how it fluctuates around its nominal value. The voltmeter has a measuring range of around 50 V that you can centre around 220 or 240 V to suit your needs. ….must register on this site.... [Published in Elecktor July/August 2010]
Serial Voltmeter using the PIC16C71 -  Building a serial voltage meter to measure from 0 to 5 volts DC is actually pretty easy. Using MeLabs PicBasic, and Microsoft's Visual Basic Version 5 Pro. You need Visual Basic Pro version because you will have to use Basic's MSComm control.  This control is not available in the Visual Basic 5 "Learning" Edition. The PIC16C71 simplifies the task even more by having a built in A/D converter. Pins 17,18,1,2 are the analog inputs AIN0,AIN1,AIN2,AIN3 respectively. ….(electronic schematic added 11/08)
Simple Voltmeter Monitors TTL Supplies -  National Semiconductor Application Note  (app note added 2/06)
Single-chip Digital voltmeter -  This 4 1/2-digit DVM circuit is built around a Maxim ICL7129ACPL A/D converter and LCD driver….(schematic / circuit added 6/07)
Talking Voltmeter -  Ever needed to measure a voltage without taking your eye off something? If so, then this is the project for you! The Orton Talking Voltmeter takes a voltage measurement in the range 0-5 Volts and then reads it out to you to two decimal places (i.e. to 10mV resolution). The design illustrates the use of the 10 bit ADC in the PIC,....(added 04/04/04)
Volt Meter with Video Output -  (schematic / Circuit design added 08/05)
Voltmeter Monitors TTL Supplies -  National Semiconductor Application Note  (app note added 2/06)

Volt Meters Circuits

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