A Butterworth low pass filter processes the DDS signal and then feeds a two-transistor amplifier. The circuit will output ... to process the data from the Arduino. For example, here’s a plot ...

[Fileark] built and ESC using an Arduino and has a couple of posts explaining the concept and demonstrating how it works. His test circuit uses six 2N2222 transistors to protect the Arduino from ...

As with many inventions, two people had the idea for an integrated circuit at almost the same time. Transistors had become commonplace in everything from radios to phones to computers, and now ...