Practical loudness control circuit

Posted on Mar 28, 2007

Figure 1-91 is added loudness volume control circuit practical circuit. It plugs into the preamp and tone control circuit of the room, behind the OCL and other can be connected to the main amplifier. Practical effect proved effective. In volume was very hour,

Practical loudness control circuit
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can get a clear, soft bass o preamp output stage uses emitter-current source, thus ensuring a very low output impedance and good follow-up characteristic. Its operating current adjusted between 4 ~ 6mA, under load is small, it can also have a sufficient signal level outputs, and to ensure minimum distortion (when the volume is zero, the load on the preamplifier lower resistance Ri) o after loudness with the volume control FET, a high input impedance and low noise figure. The circuit plus the high end of the compensation, lack of treble if used according to the dashed line in Fig added high-frequency compensation, adjusting the resistance in order to change the compensation level.

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