Testing voltage follows a simple process. For those of you new to electrical testing, we asked our resident Pro how they might teach an apprentice how to use a multimeter or voltmeter. Once you know how to use a multimeter, you can move on totroubleshooting and fixing electrical problems, v...
To perfom all 4 tests should only take a couple of minutes per speaker and they are all super easy to do. Apart from the sweep test (optional, but highly recommended), all of these tests can be done with just your bare hands, eyes, ears, and the gear you likely already own as a ...
My aim is to show you some basics on how to “revive” a speaker yourself. With the term “revive” I want to say, that I am not going to explain how to fix the broken amplifier circuit or power supply unit, but instead how to replace it with (possibly) a cheap new one. We wil...
Use electrical contact cleaner to clean the input jacks and speaker terminals. If one of the input jacks is disconnected from the wires, either reconnect or resolder it. Use a multimeter to test all fuses. If none of these measures solves the problem, seek professional help. Modern audio equ...
Electrons with a negative charge flowing through a conductor © Eugene Brennan In reality, electrons don't actually move from one end of a conductor to another. Instead they transfer energy between each other just like the steel balls in this Newton's cradle, while moving negligibly ...
How to check AC Voltage with a multimeter Connect the red Test Lead to “VOhmsmA Jack” and the black lead to AC Current Circuit Symbol “COM” jack. Set the “Range Switch” to desired AC V position. Connect Test Leads to device, electronic component or circuit being measu...
Transformer which is used to match driver output impedance with a speaker impedance is pretty common solution. For example it was often used for a tube receivers, where tube has high output impedance but speaker has very low impedance. In your case it's the other way around, you're needs ...
Most multimeters provide a feature that allows you to test the continuity of your circuit. This allows you to easily detect bugs such as faulty wires. It also helps you check if two points of the circuit are connected. To use this functionality select the mode that look like a speaker. ...
There are several ground tags which connect to the metal chassis when the board is screwed into place. The top board contains 89 test points. After lots of probing with a multimeter and oscilloscope, we were able to determine the purpose of many of the test points. The table below shows ...
A resistance is a DC resistance, which can be measured with an ohmmeter. If there is a capacitor in the signal path we measure nothing. With a voice coil of a speaker we can measure a DC resistance. With a digital multimeter DMM resistances can be measured easily, but we cannot measure...