Simple vu Meter Analog Circuit

Here is vu meter analog circuit. The circuit is left connected to the line terminals of the amplifier. The VU meter is quite simple. T1 and T2 signal increase. The signal is then rectified by two diodes and fed to the meter. The capacitors C3 and C4 ensure that the voltage is slightly flattened and the meter responds less quickly. After building the circuit must be calibrated. To this end, the VU meter connected to a tone generator that delivers 0.3 V at 1000 Hz. Then P1 turned completely, ie the bishop of P1 lies at the entrance. P2 is then cut so that the meter is full deflection controls. Then P1 meter set to 0.5 mA (= half results) indicates. For a stereo VU meter circuit should be built twice.

part of list:

R1 = 1 MO
R2 = 820 O
R3 = 2,2 kO
P1, P2 = 100 kO
C1 = 330 nF
C2 = 22 μF
C3 = 1 μF
C4 = 470 μF
T1, T2 = BC 547B
M1 = meter 1 mA

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