I designed a single stage transistor amplifier as shown in this schematic:
I constructed this on a breadboard and applied the DC bias voltage to check the biasing conditions. Prior to this, I made the following assumptions: 1. The collector current ( also almost equal to emitter current) is 2mA. 2. The small signal gain of the transistor is 100. 3. The collector to emitter saturation voltage is 0.2V.
Now with these assumptions, I calculated the resistor values Rc and Re. As per my analysis, I had predicted that the voltage drop across Rc, Rc and Vce would be 3V. But in practice, when I measured the DC voltages, I found the voltage across Rc to be 4.1V, that across emitter was 4.2 volts and the voltage Vce was 0.7 volts.
This meant that the transistor was being driven into saturation and when I connected to a speaker, the output was attenuated rather than amplification. Where did I go wrong in my analysis?