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The breadboard power supply stick regulates voltage from a 9V wall wart to either 5V or 3.3V to the power rails. A simple circuit, involving a button, an LED, and a resistor, built two different ways. The circuit goes as follows: There is a wire connecting the VCC power rail to the positive, anode leg of an LED.
The price of Breadboard Power Supply Module 3.3V/5V for Arduino in Sri Lanka is Rs 350 at 1 shop.
37left.lk lists Breadboard Power Supply Module 3.3V/5V for Arduino prices from 1 shop in Sri Lanka on one page.
Yes, Breadboard Power Supply Module 3.3V/5V for Arduino is available in Sri Lanka at 1 shop.