Vu meter hook up

A VU meter is an essential device that lets you monitor the audio levels in a circuit. This tells you if the volume of the audio is too loud for your equipment to.
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Similar power levels requires no modification, for much higher or lower levels, R4 must be modified and maybe also R2 and R3.

VU meter question

First the AC signal across the speaker is rectified by diode D1. D1 should be a germanium diode or a Shottky diode to minimize the voltage drop across it. Every millivolt lost here will reduce the sensitivity at low volume. But D1 has to stand twice the peak voltage of the speaker, so the reverse voltage of the diode has to be selected accordingly.

Germanium diodes have a low voltage drop, about 0. Small signal Schottky diodes can have voltage drops in the 0.

How to connect a VU meter to an amplifier ?

Don't use high current Schottky diodes or silicon diodes because their voltage drop is in the 0. Resistor R1 is a very good idea because it increases the impedance of the meter and limits the non-linear current drawn by this circuits so that it can be neglected compared to the main speaker current.


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Otherwise, connecting a rectifier in parallel with a speaker could introduce some distortion. R1 will also limit the current in D1 if the maximum diode reverse voltage is exceeded, preventing damages in case of small peaks. Capacitor C1 integrates the rectified signal and provides only DC to the meter.

Vu meter hook up. modutec VU meter hookup

Now the tricky part: These are regular small signal silicon diodes with a forward drop of 0. So for low voltages D2, D3, D4, R2 and R3 can be neglected and the current can flow directly in the meter. This can be observed in the graph below the one on the left: As soon as the voltage rises, D2 starts conducting and robs current to the meter making it less sensitive to higher voltages.


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    6. On the same graph, above 0. The effect is that the meter current slope blue trace is further reduced approximating a nice logarithmic function. To calculate this circuit especially the values of R2 and R3 , the common approximation of the 0. One has to use the diode characteristic exponential function, but equations get complicated and I wasn't able to solve it with just a pencil and a piece of paper. Fortunately, free SPICE software is available and the circuit can easily be simulated and a reasonable solution can be found by modifying the values of these to resistors until a suitable response is achieved.

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    5. How to calibrate a VU meter?.

      6. This puts the resistors in series and their values add together to create a "new" resistor with a value of ohms. Remove the outer metal shell of the female XLR connector as it will not be used. Solder one lead of the ohm resistor to pin 2 of the female XLR connector.

      Solder the other lead of the ohm resistor to pin 3 of the female XLR connector. A set of insulated alligator clip test leads Radio Shack to connect the multimeter to the ohm load.

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      What are the steps for calibration? Using the alligator clip test leads, connect one multimeter probe to pin 2 of the female XLR. Connect the other multimeter probe to pin 3 of the female XLR.