Goal of the circuit:
- Must be able to deliver 1.5 W to the speaker (8 Ω) at 1 kHz.
First Problem
1.) how can we drive an 8 ohm speaker if it can only support around 1.5-2 watts? Because when we input 8ohms as the load the Vout decreases.
- Coupling capacitor formula we used is 1/2pi(lowest frequency)(resistance seen by capacitance) 20Hz was the lowest frequency I used.
Referencing to the image above. If we add a common emitter by our understanding it should increase the power but even with coupling capacitor, it won't shift down to AC.
The next step we did was thinking of adding a darlington pair, it did increase the gain, but it still doesn't want to make the AC waveform shift down to its negative half cycles for a safer speaker usage.
above is the darlington w/ ce and ef (1s)
above is without the darlington.
Summary
Our goal is to get the output that is the same in the photo below. note The RL (R6) is 100K ohms but we want that output if our desired Load is an 8ohms 2W Speaker, that can ultimately support 1.5-2W power for the speaker. What changes can we implement in our design to achieve this?
