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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) |
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 Expanded
scale indicator revisited - 08/08/02
EDN-Design Ideas: 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 expa.....(design idea
added 1/05)
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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 added 6/02) |
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Four Channel Digital Voltmeter with Display and Keyboard - Microchip Application
Note Published 27-May-05 (app note added 2/06) |
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High Impedance Voltmeter - (schematic / circuit added 2/07) |
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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...(schematic added
6/07) |
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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 (added 6/07) |
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How to Use the MAXQ2000 as a Voltmeter - Maxim App Note 4194 -- 3/24/2008 --
(app note add 5/08) |
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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) |
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LB-48: Linear Brief 48 Simple Voltmeter Monitors TTL Supplies - National
Semiconductor Application Note (app note added 2/06) |
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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) |
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LED Voltmeter - Measures voltages up to 199.9V with 0.1V resolution.
(circuit added 8/06) |
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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) |
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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(electronic diagram added 6/03) |
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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.....(electronic Circuit / Schematic added 10/04) |
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MicroController functions as voltmeter - 05/10/07 EDN-Design Ideas: PIC
microcontroller and FETs enable a four-digit voltmeter.....(design idea added 9/08) |
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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) |
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Simple Voltmeter Monitors TTL Supplies - National Semiconductor Application Note
(app note added 2/06) |
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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) |
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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) |
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Volt Meter with Video Output - (schematic / circuit design added 08/05) |
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Voltmeter Monitors TTL Supplies - National Semiconductor Application Note
(app note added 2/06) |
