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Watt Hour Meter Circuits
 

Last Updated: November 30, 2017 10:28 AM

Circuits Designed by Dave Johnson, P.E. :
Watt-Hour Meter Monitor -  Have you ever wondered how much power your house or apartment is using?  Most watt-hour meters are like the one shown below.  Some newer ones have a digital display but there millions of these older models still in use . . . Hobby Circuit designed by David Johnson P.E.-September, 2008



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

0.3-1.5V LED Flashlight -  it's a little wisp of a circuit that allows you to drive a blue or white LED from a low voltage.  Normally, if you want to light up a blue or white LED you need to provide it with 3, 3.5 V, like from a 3 V lithium coin cell.  But a 1.5 V battery like a AA cell simply will not work.  But using the Joule Thief, it works like a charm.  Not only does it work with a brand new battery, but it works until the battery is nearly dead-- down to 0.3 V.  That's well below the point where your other toys will tell you the battery is dead, so it can steal every last joule of energy from the battery (hence the name).  To learn how to make one, watch the video, which is available in a variety of formats.  __ Evil Mad Scientists Laboratories

1-IC Forms Precision Triangular-Wave Generator -  04/08/10 EDN Design Ideas:  Generate a triangular wave for testing other circuits.   __ Circuit Design by Akshay Bhat, Maxim Integrated Products Inc, Sunnyvale, CA

30 W Digital Wattmeter for RF (0-500 MHz) -  This project will explain how I build my new wattmeter.  This watt meter will be able to measure power from 300 nW to 30 WAT (0-500 MHz).  This wattmeter is based up on a dummy load of 50 ohm which can handle 50 W.  The measurement will be displayed __ Designed by Radio LocMan

30W Digital RF Wattmeter -  This project will explain how I build my new wattmeter.  This watt meter will be able to measure power from 300nW to 30W @ (0-500MHz).  This wattmeter is based up on a dummy load of 50 ohm which can handle 50W.  The measurement will be displayed in Watt on a 2x16 Char display.__ 

A Switchable RF Probe/Watt Meter for the FM Transmitters -  This unique project is one of the most trusted homemade test instruments to have, once you get your FM transmitter up and running !  !  ! This simple little device is capable of finding your FM transmitters' __ Designed by braincambre500 @ yahoo.com

Analogue Wattmeter -  Unlike current or voltage measurement, the measurement of power is somewhat inconvenient as power is the product of voltage (V) and current (i) flowing through a dissipative circuit.  in a linear-moving coil...__ Electronics Projects for You

Digital Wattmeter, measures from nanowatts to kilowatts using AD8307, PIC16F876, LCD Display -  The extra input B is for a later SWR brigde project, also the TX serial output will be in use later.  The uncalibrated signal response is: +1/-1 dB from 1MHz to 450MHz.  input SWR vill varry from 1.00 to 1.30, depending on input frequency.  To make the SWR this good, you need to assemble the input circuit correct and adjust the capasitor.  input power range: -60 to +30dBm that is 1 nW to 1 Watt.  __ Thomas Scherrer OZ2CPU

Make a Joule Thief -  it's a little wisp of a circuit that allows you to drive a blue or white LED from a low voltage.  Normally, if you want to light up a blue or white LED you need to provide it with 3, 3.5 V, like from a 3 V lithium coin cell.  But a 1.5 V battery like a AA cell simply will not work.  But using the Joule Thief, it works like a charm.  Not only does it work with a brand new battery, but it works until the battery is nearly dead-- down to 0.3 V.  That's well below the point where your other toys will tell you the battery is dead, so it can steal every last joule of energy from the battery (hence the name).  To learn how to make one, watch the video, which is available in a variety of formats.  __ Evil Mad Scientists Laboratories

Single IC Forms Precision Triangular-Wave Generator -  04/08/10 EDN Design Ideas:  Generate a triangular wave for testing other circuits.   __ Circuit Design by Akshay Bhat, Maxim Integrated Products Inc, Sunnyvale, CA

Switchable RF Probe/Watt Meter for the FM Transmitters -  This unique project is one of the most trusted homemade test instruments to have, once you get your FM transmitter up and running !  !  ! This simple little device is capable of finding your FM transmitters' __ Designed by braincambre500 @ yahoo.com

Watt Meter Measures True RMS Watts -  This circuit will give you a good, Accurate Watt Meter that can measure various power levels.   In the Origional Article the Shunt was a .001 Ohm Copper Shunt giving a 1000 Watt Scale.   However, because Most Circuit Breakers in homes are 15 Amps, I made my unit to have a range of Zero to 1500 Watts. __ Designed by G.L. Chemelec

Watt-Hour Meter Monitor -  Have you ever wondered how much power your house or apartment is using?  Most watt-hour meters are like the one shown below.  Some newer ones have a digital display but there millions of these older models still in use . . . Hobby Circuit designed by David Johnson P.E.-September, 2008

Wattmeter -  The extra input B is for a later SWR brigde project, also the TX serial output will be in use later.  The uncalibrated signal response is: +1/-1 dB from 1MHz to 450MHz.  input SWR vill varry from 1.00 to 1.30, depending on input frequency.  To make the SWR this good, you need to assemble the input circuit correct and adjust the capasitor.  input power range: -60 to +30dBm that is 1 nW to 1 Watt.  __ 

WATTMETER (uses DVM for display) -  This is a pretty good half wave wattmeter that display true watts.  its output is a DVM floating on the power line, so be careful!  __ Designed by Dick Cappels

Weekend Projects with Bre Pettis: Make a Joule Thief -  It's a little wisp of a circuit that allows you to drive a blue or white LED from a low voltage.  Normally, if you want to light up a blue or white LED you need to provide it with 3, 3.5 V, like from a 3 V lithium coin cell.  But a 1.5 V battery like a AA cell simply will not work.  But using the Joule Thief, it works like a charm.  Not only does it work with a brand new battery, but it works until the battery is nearly dead-- down to 0.3 V.  That's well below the point where your other toys will tell you the battery is dead, so it can steal every last joule of energy from the battery (hence the name).  To learn how to make one, watch the video, which is available in a variety of formats.  __ Evil Mad Scientists Laboratories

Weekend Projects with Bre Pettis: Make a Joule Thief -  In this week's Weekend Projects video podcast, Make Magazine's Bre Pettis and I show you how to make a Joule Thief.  The PDF file that goes with the podcast is here (450 kB PDF file).  So whatsa Joule Thief? it's a little wisp of a circuit that __ Designed by Bre Pettis

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Watt Hour Meter Circuits


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