Input Audio signal for the first circuit is applied to the BC 547 base through Capacitor C1 (47♟) and Collector coupled Resistor R1 hence the enough Audio signal and bias above cutoff voltage is constantly present at Base terminal of BC 547 and amplify the input signal near to peak Vcc. To construct Amplifier circuit start with Transistor BC 547 and Connect proper bias to Collector, Base and Emitter terminals, For the first circuit Loud speaker is directly connected to the transistor collector terminal and for Preamplifier circuit speaker connected through coupling capacitor C2. Two types of single transistor audio amplifier circuit designed with BC 547 transistor, here first one is for to amplify direct audio signal and another one is for to amplify audio signal from condenser MIC as a preamplifier. Apply 9 Volt DC supply for better result. This circuit can drive 8 ohm loud speaker and produce considerable sound. 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.
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