Academy Audio Hi-End MUSES VCM Manuale d'uso - Pagina 6
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L+
L-
R-
R+
Figure 3. MUSES®72320 Volume Control Chip Recommended Application.
Capacitors Cin connected to input pins 23 – In_R and 26 – In_L perform the function of the capacitor C1
of Fig. 2. Capacitors equivalent to the capacitor C2 of Figure 2 are omitted due to external J-FET opamps
used at the potentiometers' outputs.
Two 10kΩ internal potentiometers connected to pins 5, 7, and 8 for the Left channel, and pins 9, 10, and
12 for the Right channel allow to add up to +31.5dB gain to each channel if desired. When these pots
are configured for a 0dB gain, the opamps act as buffers introducing minimum distortion and noise to
the signal.
7. Application Information
7.1. Power and Audio Connections
The VCM board features separate connections for the Left (Com_L) and Right (Com_R) analog grounds.
These grounds are connected on the board to minimize cross talk. It is recommended to use isolated
ground audio connectors to ensure the lowest cross talk and noise pick-up. Make sure the input signals
do not exceed 9Vrms at +/-15V analog power.
The VCM board features a footprint U2 for a dual JFET opamp in a DIP-8 case. A high quality dual opamp
such as MUSES01, MUSES8920, OPA2604, or similar installed in a position of U2 provides the most
compact and efficient Volume control solution.
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