doorbell diode

If you build a microcontroller sound sensor, you can install it on an LM386 based amplifier. It's cheap, easily available and does not require too many external parts. A nice feature of the LM386 i

Ohm’s Law Ohm's law states that the current is directly proportional to the voltage and vice versa proportional to the resistance. This means that as the voltage increases, the current increases incr

The standard bipolar or BJT transistor is presented in two basic forms. An NPN type (Negative-Positive-Negative) and a PNP type (Positive-Negative-Positive). The most commonly used transistor confi