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Measuring Impedance - Learn About Electronics
https://www.learnabout-electronics.org/ac_theory/impedance73.php#:~:text=Connecting%20an%20Ohm%20meter%20across%20the%20input%20or,a%20decade%20resistance%20box%20or%20a%20variable%20resistor.
How To Measure Input Impedance Of Solid State Amplifier ...
https://www.diyaudio.com/community/threads/how-to-measure-input-impedance-of-solid-state-amplifier.72701/
You need to know the output impedance of your generator for that to work accurately. Measure the open circuit voltage from the generator/ sound card. Increase the resistance until the signal is 1/2 what it was, measure at the input terminal of the amp. Measure the series resistance. That's what it is. Works every time.-Chris •••
Measuring input impedance and calculating output …
http://www.sengpielaudio.com/calculator-InputOutputImpedance.htm
How to measure the input impedance of my audio …
https://www.quora.com/How-can-I-measure-the-input-impedance-of-my-audio-amplifier-if-I-dont-know-what-is-inside
To measure the input impedance you use a setup like the one below, where the input impedance is Zi. Apply a signal generator to the input of the amplifier through a series resistor (Rtest). Then measure the AC voltage at the input port of the amplifier (between IN and ground, thus across Zi) and also measure the voltage across the resistor Rtest.
What is Impedance in Audio? Input and Output …
https://virtuosocentral.com/what-is-impedance-in-audio/
In audio devices, impedance is the measure of the resistance of a circuit to alternating current (audio signal). It’s measured in Ohms. The “Z” symbol represents impedance. All audio equipment that receives an input and has an output will have impedance measurements, namely input, and output impedances. More on that later.
Measuring Impedance - Learn About Electronics
https://www.learnabout-electronics.org/ac_theory/impedance73.php
The set up for measuring input impedance is illustrated in Fig. 7.3.1. A variable resistor or a decade resistance box is connected between the signal generator and the amplifier input and its resistance is set to zero Ohms. An oscilloscope or AC voltmeter is connected across the amplifier load (e.g. loudspeaker).
Amplifier Input Sensitivity/Impedence Specifications ...
https://www.stereophile.com/content/amplifier-input-sensitivityimpedence-specifications-1
V1=component output voltage. V2=amp input sensitivity. So, my CD player output is 2000mV and the amp's input sensitiviy is 200mV. 20*log (2000/200)=20dB. So, -20dB on the volume should be maximum output of the amplifier with this component. In other words, maximum volume should be obtained at -20dB on the volume scale.
Guidelines for Measuring Audio Power Amplifier …
https://www.ti.com/lit/pdf/sloa068
Two audio measurement system (AP-II) (Reference 1) by Audio Precision includes the signal generator and analyzer in one package. The generator output and amplifier input must be AC-coupled. However, the EVMs already have the ac-coupling capacitors, (CIN), so no additional coupling is required. The generator output impedance should
Is there any standard for the input impedance of an audio ...
https://electronics.stackexchange.com/questions/342975/is-there-any-standard-for-the-input-impedance-of-an-audio-amplifier
Input impedance is dependent on used resistors, in this case there's a resistor just like in the input of inverting amplifier made of an opamp. That resistor = the input impedance. The gain also depends on it. With extreme good luck the input impedance can be 20kOhm. (=component value in the example application circuit).
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