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Joule Meter
Circuits
 

Last Updated: December 31, 2017 06:49 AM


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

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

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


Joule Meter Circuits


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