I have created this simple single stage, transistor audio amplifier using voltage divider bias.
For testing, the source of input signal was audio from laptop and the output was from a 4 ohm, 0.25 watt speaker. When I applied the input signal, I could hear only very very minute sound in the output. When I connected the speaker directly to the source, it produced good audible sound. Why is this amplifier not amplifying then? Where lies the mistake. I've also went through the datasheet of the transistor and suitable chosen the collector current value of 5 milli-ampere and calculated the resistors appropriately. Please suggest some corrections.