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Power Meters / Monitors

Last Updated: June 02, 2021 01:44 PM

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

AC power Monitor uses remote sensing-  04/26/01 EDN Design Ideas:  The detection circuit in the Design Ideas - "Circuit monitors ac-power loss" (EDN , Nov 24, 1999, pg 172) requires a physical connection with the mains to sense the power loss.  The circuit in Figure 1 senses the power loss through the radiated power-line signal Design by Sanjay R Chendvankar, Tata Institute of Fundamental Research, Colaba, Mumbai, India

Advanced VHF Power Meter-  The DVM (Digital Volt Meter) also displays the correct polarity sign.  There’s neither rocket science nor smoke and mirrors here folks: It’s all done simply with op amps and resistors! __ Designed by Prject Wes Hayward, W7ZOI and Bob Larkin, K7PUA that appears in QST, June 2001

Make a Low Cost Benchtop Power Meter-  09/11/98 EDN Design Ideas:    NOTE:    FILE has several circuits, please scroll to find this one.  With a few inexpensive ICs and passive components, you can easily make a multirange power meter suitable for use on your benchtop.  The circuit in Figure 1 measures currents from microamps to amps and voltages as high as 100V.  The voltage at VOUT, which you can monitor with a DVM, indicates the load's power. Design by Jim Todsen, Burr-Brown Corp, Tucson, AZ

Optocoupler simplifies power-line Monitoring-  10-Jan-02 EDN Design Ideas:  The use of a linear optocoupler and a capacitor-based power supply yields a simple, yet precise power-line-monitoring system.  The circuit in Figure 1 converts the 110V-ac power-line voltage to an ac output voltage centered at 2.5V, covering 0 to 5V.  The circuit isolates the output signal from the power line Design by Alfredo del Rio and Ana Cao y Paz, University of Vigo, Spain

Power meter is ±1% accurate-  05/30/02 EDN Design Ideas:  Power meters provide an early warning of thermal overload by monitoring power consumption in high-reliability systems.  Power monitoring is especially suitable for motor controllers, industrial heating systems, and other systems in which the load voltage and current are both variable.  The power meter/controller in Figure 1 uses the principle that power is the product of voltage and current Design by Ken Yang, Maxim Integrated Products, Sunnyvale, CA

Power meter uses low-cost multiplier-  12/23/99 EDN Design Ideas:  A power-meter circuit typically requires either an analog or a digital multiplying circuit.  These circuits can be complex, finicky, or expensive Design by Jeff Kotowski

Power Supply Failure Alarm-  Most of the power supply failure indicator circuits need a separate power supply for themselves.  But the alarm circuit presented here needs no additional supply source.  It employs an electrolytic capacitor to store adequate charge, to feed power to the alarm circuit which sounds an alarm for a reasonable duration when the supply fails.__

RF Power Meter for the QRPer-  amateur radio construction projects. __ Designed by Peter Parker

Power Meters / Monitors

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