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Volt Meters Circuits

Digital Mains Voltage Indicator
Digital Volt Meter
Digital Volt Meter With Video Output:
Digital Voltmeter
DIGITAL VOLTMETER:  This is just a schematic view of a digital voltmeter all components and values are listed.
Expanded scale indicator revisited:  08/08/2002  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 expand the middle region of the scale? Figure 1a illustrates the challenge. A voltmeter comprises a 100-A dc meter and a series resistor
Expanded Scale Voltmeter uses Just Two Parts:  01/20/1994 EDN Design Ideas / The expanded voltmeter doesnt 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 a split voltage reference system with floating output, the zero point of the voltage supplied to the meter equals the absolute sum of the two references.  
Improve Voltage Readings By Doubling A DVM's Scale:  04/29/02 Electronic Design - Ideas for Design / The ubiquitous, and now inexpensive, 1999-digit digital panel meter or digital voltage meter (DVM) module is a very useful addition to the range of test and display gear currently available. It's accurate, robust, and easily scaled for ranges from. . .
Indicator features expanded scale:  02/21/2002  EDN - Design Ideas / Test equipment for a production line should be user-friendly (read "idiot-proof") and should offer minimal test time. In many cases, the test fixture must give an operator only one answer: pass or fail. Usually, two indicators assume this role: green for pass and red for fail. In most applications, a sensor transforms the tested parameter to a voltage; the test fixture must measure this v... .
Led display digital Voltmeter
Low Power LED Volt Meter
Precision Audio Frequency Peak Detection Probe :  for use with a digital voltmeter
Three Level Audio Power Indicator:  Battery-operated Three LED display that connect it to loudspeaker output
Voltmeter




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