Precision Analog VU-meter Circuit
The virtual circuit
The theoretical circuit of the structure is made up of two identical circuits based on a power amplifier that covers each channel. Each channel is an amplifier. At its exit we have connected a micro-ammeter via a bridge, which gives the sound level to each channel. The bridge rectifies the alternating current and the capacitor present at each output increases the inertia of the instrument. At the input of each operator there is one trimer to regulate the sensitivity of each channel. The diodes that are wired, back to back, due to their linear function, create a logarithmic response to the characteristic transfer of each operator.
The construction does not show any critical points. All materials are placed on the board designed for this purpose. Start building by first attaching the resistors and the connection to the power supply and other external connections and finish with the unique integrated construction.
Allow the materials to be polished to prevent them from sticking upside down. When finished, connect the voltage and signal the corresponding inputs of the construction. With the trimers that exist, adjust the instruments so that there is no indication in the absence of a signal.
|Electronic Components Needed|
R2: 100KΩ TRIMMER
C2: 1 μF
|D1: 4 X 1N4148
D4: 4 X 1N4148