VU Meter using LM3915

Posted on Feb 6, 2014

This is a circuit schematic diagram for the VU meters. Circuit diagram is controlled by IC TL072. A measurement circuit according to the National general application. Around the input circuit IC1 to make adaptation and amplification of the trimmer TR1 [GAIN]. Around the circuit IC2 LM3915 makes a half-wave rectification of the acoustic signal. W

VU Meter using LM3915
Click here to download the full size of the above Circuit.

ith the switch S1, we select the type of indication, that we will have the LED. Circuit diagram to control LED depat led 19 men. With the price of R6 and R7 resistance in the circuit, signal level, the entry is 7. 8V (IC1 gain first stage, is one), and the difference in level between LED D10-11, should be 3 db. Department of positive supply, should have the possibility to give more this time, one and it is overloaded with LED current. The following is a schematic drawing:

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