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The circuit of asingle stage resistance capacitance-coupled amplifier employing the common base configuration.The circuit sometimes called ‘Grounded Base.
This amplifier provides voltage gain of 80 when operated into a high impedence load.Power outpot is 1.8milliwatts.Its input impedence is 180ohms and output impedence 5,000 ohms.Themaximum input signal voltage which may be applied before output voltage peak clipping appears is 0.1 volts rms.The corresponding maximum output signal is 8 volts rms.
Two batteries are required in the common base amplifier,B1(1.5 volts) for the emitter bias and B2(6 volts) for colector bias.battery B2 supplies approximately 0.8 milliampere dc and battery B1,0.85ma.The dpts switch (S1-S2)makes and breaks connections to the batteries simultaneously.
This is an alternative,single battery circuit.Here,voltage divider R3-R4 is operated with a single 7.5 volts battery.current flowing through the divider develops the emitter voltage as a drop across and collector voltage across R4.The bleeder current is 9.62 ma.All resister in the circuit 101 and103 are half watt.Capacitors C1 and C2 may be miniature,low voltage tantalum electrolytics if subminiature is desired.
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