If you connect your speaker to an amplifier you don't know about, you can measure its maximum output power. You will also need this to repair and tune your amplifier in the future.
Necessary
- - oscilloscope;
- - multimeter;
- - amplifier.
Instructions
Step 1
Connect one of the channels of your amplifier either to the speaker, if the rated power of the speaker is obviously higher, or to any equivalent load, the impedance is equal to the impedance of the speaker. Use a resistor of the type PEV as an equivalent load, with a capacity of 10 to 100 watts. Apply a sinusoidal signal to the amplifier input, the frequency of which can be from 100 to 200 hertz; you can send the usual music signal. Increase the volume gradually.
Step 2
At this time, observe the oscilloscope screen and notice at what voltage the signal amplitude limiting at the amplifier output will begin. When measuring maximum output power, do not input high frequency signals from an oscillator to the input of an amplifier that is connected to multi-way speakers. This could overload the speakers.
Step 3
Watch the oscillogram. This image - https://oldoctober.com/pics/sonics/power01.png
Step 4
Substitute this result in the formula P = (U x U): (2 x R), where P is the output power of the amplifier in Watts, U is the output voltage of the amplifier in Volts, and R is the load resistance. This way you can calculate the power of the amplifier.
Step 5
Use a voltmeter to measure the power of the amplifier. Connect it with a diode and a capacitor. Use this diagram to connect - https://oldoctober.com/pics/sonics/power04.png. Use a software low frequency generator to get a sinusoidal signal.
Step 6
Follow the link https://iurii-shalaev.narod.ru/download.html#generator and download the Low Frequency Generator application from the site. Run the program, connect the circuit and apply a signal to the amplifier. Next, use a voltmeter to measure the power of the amplifier.
