Audio loudness control

If your main amplifiers. But the sound is not clear as low treble and little bass. We offer an easy way. Using less equipment. You create a very simple

Audio loudness control circuit used to add bass. More during the normal listening levels.
It is a passive circuit and does not use the power supply.


When the input signal into. Switch S1 is an option to use open (ON) using loudness control. Off (OFF) to use a bypass. When the switch S1 to the ON position the signal will flow through C1(0.001uF), C2(0.01uF) and R1(2K). This will serve as a low pass filter circuit.VR1 is adjusted by the strength of the signal to the output.VR1-100K Linear Potentiometer, which uses the volume type with a central bar (Center Tap) only. The output of the circuit will be connected to the region to pre-tone next step.


Note: All capacitors use Ceramic Capacitor or Mylar Capacitor them low cost


How to build
This circuit has a few components so you can builds easily as Figure 2 make PCB layout and putting all components on PCB and connecting to your audio system.

Figure 2 The PCB and components layout of this projects.

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9 thoughts on “Audio loudness control”

  1. Hi there, what is the potentiometer with a centralmtap.?
    Does it have 4 connections per channel.?
    I only know potmeters with 3 connections…

  2. Hi, I just build the loudness circuit for my amp. It sound great. But I find that the bass is a bit too powerful. May I know what value to chance & where to change to reduce the bass a little? Thanks.

  3. Do any of the values have to change if you are using a 50k or 25K volume control. If you are using a VC with 4 connectors (2 rows of 4 connectors), which tap do you use?


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