Bc547 Transistor Amplifier Circuit Diagram. Also to increase a small audio signal to strength to go into a power amplifier circuit. The on off touch switch using transistor bc547 is shown below.
Thus the base terminal of the q3 transistor is high throughout the r7 resistor to maintain in cut off condition. If you want to built simple audio amplifier without messy components then you can construct simple single transistor audio amplifier circuit using bc547 and resistor capacitor. Now take a soldering iron and then pre tin the legs of the soldering iron.
See below for example circuits.
This is a higher preamplifier circuit. The on off touch switch using transistor bc547 is shown below. Apply 9 volt dc supply for better result. Different configurations used in amplifier circuits some of them are.
