Temperature Sensitive Joule Thief
I had some little PC boards made for a new
set of Joule Thiefs to add to my collection. Above the right eye is a
temperature sensitve thermistor. As the temperature rises, the
resistance gets less. The blink rate will increase . In the
freezer, the blink rate is once every 10 seconds. At normal room
temperature the blink is about once per second and in the sun, the leds
stay on.
The schematic is a modified version of Watson's
Weird One. My schematic can be found here.
