Despite the fact that USB is live for more than 10 years - electronic amateurs move towards it relatively slowly. Probably main reasons are that many electronics work with relatively old computers where RS232 port is actively used. Even me when buying new PC I was looking that motherboard was equipped with at least one [...]

USB (Universal Serial Bus) - is type of serial communication interface since January 15, 1996 when first USB-1.0 specification came up to day light. There were several organizations behind USB creation like Compaq, DEC, IBM, Intel, Microsoft, NEC, and Northern Telecom. There are several modifications of USB, but most common for microcontrollers are Low [...]

We used to see dual supply ideal operational amplifiers (Op Amps), what means that Op Amps are powered from dual supplies with equal magnitude and opposing polarity. The center tap is connected to the ground which serves as a center of the supply voltage.
Single supply operational amplifiers are powered with single polarity voltage. In this [...]