section with the power lead-in for the dead 9V
battery. Take the power to the LED there and
feed it in between the two LEDs as shown.
In the oscilloscope trace in Screenshots 1
2, we can see that the voltage for the two
LED joule thief circuit goes up to almost 6.5V
with a battery at 1.1V. It goes to 5.84V when the
battery gets down to 0.6V.
So, there you have it. Some fun simple
circuits to light up your life. NV
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Screenshot 1. Two LED trace battery 1.1V.
Screenshot 2. Two LED trace battery 0.6V.
44 September/October 2018