Hi,
I am Working in a project for the Uni, is a circuit that measure frequency between 50Hz - 1KHz.
The circuit is based in a Microphone electret and then connected to a Impedance Matching using a JFET.
I read about the "Impedance Matching" but i still don't get very well how it works, the main idea is that help to reduce the lost of Impedance Signal from the Entrance to the exit of the circuit. (that is what i understood)
This is the Schematic of the Circuit,
What I really don't understand:
1. How i know which one is the impendance in the entrance
2. How calculate the value of the Resistance, what kind of data i need to do that.
I have more questions but atm this one i need help first.
Thanks in advance
Cheers,
Larissa.
**broken link removed**
I am Working in a project for the Uni, is a circuit that measure frequency between 50Hz - 1KHz.
The circuit is based in a Microphone electret and then connected to a Impedance Matching using a JFET.
I read about the "Impedance Matching" but i still don't get very well how it works, the main idea is that help to reduce the lost of Impedance Signal from the Entrance to the exit of the circuit. (that is what i understood)
This is the Schematic of the Circuit,
What I really don't understand:
1. How i know which one is the impendance in the entrance
2. How calculate the value of the Resistance, what kind of data i need to do that.
I have more questions but atm this one i need help first.
Thanks in advance
Cheers,
Larissa.
**broken link removed**