For the amplifier circuit, there are 2 parts, which are,
pre-amplifier --> low pass filter.
Both uses the same IC in order to amplify/filter. Since the op-amp has amplify enough the input sound thus we don't need to apply another circuit which is power amplifier where the sound is power amplify again to make it more audible/clear to be heard.
The circuit is one of the electronic part for this project.
Below is the circuit shows the pre-amplifier circuit and low pass filter.
The circuit is one of the electronic part for this project.
Below is the circuit shows the pre-amplifier circuit and low pass filter.
The input was put in at the pre-amplifier part then the output is taken after the it has been filter in the low pass filter circuit. The gain was calculated and since the pre-amplifier part is inverting amplifier thus it is less input impedance than non-inverting amplifier.
Since, the input is low-noise so the input impedance is need to be low. This is because the noise current can generate large voltage drops otherwise.
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