Electronics Tutorial for Beginners

ABC of Electronics Offering free comprehensive basic electronics tutorial. In this Electronics Tutorial we have explained the basic electronic concepts. Here you can find 8051 Tutorials & 555 Timer Tutorials which are commonly used in electronics. Every effort is made to keep the website up and running smoothly

Simple Transistor circuit

For designing this simple transistor circuit we must have a PCB and solder wire along with LED a 560 ohms resistance 9v battery and transitor.

The above figure shows a very simple transistor circuit. When a finger is placed in the circuit where shown, a tiny current of around 0.1mA flows which is not enough to light the LED which needs min10mA. However the tiny current is applied to the Base of the transistor where it is boosted by a factor (gain) of around 100 times and the LED lights