The vu-meter is distinguished in two categories, those with the needle instruments and those with the led column. Whether it is a tube amplifier or integrated amplifier, a vu-meter sound level meter is required. Today there are enough chips that do this work by using led to indicate the sound level. However, the amplifiers with LEDs are a retro version and consequently the indication of the led sound level would probably not fit in this case. While an analogue display circuit would fit perfectly. The circuit is steady, reliable, fast in response (depending of course on the inertia of the instrument) and is visually suited to tube amplifiers.
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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.
Construction
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.
The schematic differs from the pcb. For examble the OA5 are connected to the trimmer center tap via a cap 1uF. On the pcb the diodes are connected to the center tap without the cap! there is no 10uF capacitor. The 120K is a 100K. The 10uF cap is an 100uF cap.Many inconsistencies and different connection between the schematic and the pcb.Are you sure that both the schematic and the pcb are identical or have been modified by someone else??Thanks
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Spyridon Giomataris Apr 23, 2021
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good Sep 2, 2020