This 2009 circuit serves as an aid to those working on audio equipment repairs. With it, the technician can adjust the division of the power output of the sound in the channels by turning on the LEDs which can be colored. Red, green or yellow, forming a luminous VU-meter that gives the notion of balance of the stereo output. To operate, the device under test must have at least 5 W of power per channel. In S1 and S2 the selections of the output power are made in the range of 5 to 50 W. Another method of doing the test is the auditory, through the system of speakers that make up the circuit, or even by earphone. As it is a bench test, its construction and installation become different from a speaker. To connect audio devices of different brands, the inputs must be made up of different types of connectors. It is up to the installer to choose the speakers. Observe, however, before testing the device for its power so that it does not damage the speakers and speakers.
