Lab 7- EE 420L
Design an audio amplifier (frequency range from roughly 100 Hz to 20 kHz) assuming that you can use as many resistors, ZVN3306A transistors, and ZVP3306A transistors as you need along with only one 10 uF capacitor and one 100 uF capacitor. Assume that the supply voltage is 10 V, the input is an audio signal from an MP3 player (and so your amplifier should have at least a few kiloohms input resistance), and the output of your design is connected to an 8-ohm speaker (so, ideally, the output resistance of your amplifier is less than 1 ohm).
Ensure
that your html lab report includes your name, the date, and your email
address at the beginning of the report (the top of the webpage).
When finished backup your work.
1. In order to design an audio amplifier for this experiment, we start with the push-pull amplifier discussed in lab6.
Simulation
The input resistance should be a few kiloohms and the maximum current is 100uA for a 1V supply. But we found out that even with the push-pull amplifier the gain is still very small for the signal to be clear. So we use a additonal stage for increase the gain as following:
|  |
| Input Resistance | Output Resistance |
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Now we can build and test our design
Power Dissipation is about = 200mA*10V = 2W. We notice our transistor gets really hot during the test.
Input resistance is about 1k-10k which validiates our simulation
Output resitance is 8 ohms from our speaker.
