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This circuit boosts the voltage from a flat AA battery, using up the last of the power in the battery, which normally would be unusable.The completed torch is quite bright, comparible to the LED Torch built into a smartphone. Complete build instructions are available at:- http://build.dsmcz.com Comes with extra battery holders, more wire, and an extra...
The DSO138 digital oscilloscope kit adopts ARM Cortex-M3 processor and with 2.4-inch TFT screen. It can display frequency, period, pulse width, duty ratio, MAX./MIN./AVG./Peak-Peak/virtual values.