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A simple impedance meter can be useful to measure the actual impedance of a speaker or headset, ideal for anyone working with sound, making and repairing speakers. This impedance meter works in conjunction with a multimeter or oscilloscope to measure the impedance. Meter Impedance Speaker Circuit Diagram How to make the measurement of impedance speaker with the multimeter Connect a digital multimeter to AC voltage in the range of 200mV. Connect the device under test terminals SW1 to R7, if the value of the measured impedance is less than 100 ohm R8 or upwards. With SW2 in the "Set" power-on circuit through SW3 Adjust P1 to read exactly 100.0mV the display DVM Switch SW2 in the "Measure" and read directly from the speaker or headphones impedance value on the display DVM, eg 8.2mV = 8.2 Ohm / 80.1mV = 80.1 Ohm How to make the measurement of impedance speaker with the oscilloscope: Connect the oscilloscope instead of DVM (multimeter) and turn P1 fully clockwise. Short...

If you need to use a headset with your PC, then you will know how frustrating it is continuously swapping over speaker and microphone cables. This is even worse if the PC is parked in a dark corner and the hard-to-read writing on the sound card sockets is covered in dust. This simple switch box eliminates all these problems. It sits on top of the desk and connects to the PC with stereo one-to-one cables. On the rear of the box are sockets for the PC speaker and microphone connections and the existing speakers. On the front of the box are the sockets for the headset microphone and headphones, an input for an external microphone and two switches. One switch is used to direct the sound card output from the PC to either the existing speakers or the headphones. Circuit diagram: Speaker-Headphone SwitchCircuit Diagram The second switch connects either the headset microphone or the external microphone to the input socket of the PC sound card. The switches used were 3 position 4 pole rota...

If you need to use a headset with your PC, then you will know how frustrating it is continuously swapping over speaker and microphone cables. This is even worse if the PC is parked in a dark corner and the hard-to-read writing on the sound card sockets is covered in dust. This simple switch box eliminates all these problems. It sits on top of the desk and connects to the PC with stereo one-to-one cables. On the rear of the box are sockets for the PC speaker and microphone connections and the existing speakers. On the front of the box are the sockets for the headset microphone and headphones, an input for an external microphone and two switches. One switch is used to direct the sound card output from the PC to either the existing speakers or the headphones. Circuit diagram: Speaker-Headphone Switch Circuit Diagram For Computers The second switch connects either the headset microphone or the external microphone to the input socket of the PC sound card. The switches used were 3 position 4...