This circuit is suitable for a headphone. Transistors Q1, Q3: 2SA1015 Q2, Q4: 2SC1815 S1: SPST Slider Switch Others As the only one input audio signal changes. It has audio headphone output with both the positive and negative half. They amplify a signal of the negative half cycle. On the other hand, the negative half is through C9 to C11 to Q1 and Q3. The Q2 and Q4 will be amplified of the positive half cycle. When added to the positive half cycle through C10 to C12 in the previous. The incoming signal is both positive and negative.
Then, the signals through the bass-treble adjustment circuit, into transistors Q1, Q2, Q3 and Q4. To change the devices (C9, C10, C11, and C12) will change the sound frequency left and right, too. There are R1, R2, C3 and C4 determine the bass for the left headphone, And R3, R4, C7, C8 determine the bass in right.ĥ. Adjusts the audio signal to a lower frequency, both the left and right channel. Adjusting the bass, the VR2 is a dual audio potentiometer. Very simple amplifier circuit using transistor 2N3904Ĥ.4 Preamplifier circuits using transistors.Here are a few related articles you may want to read: By changing the value of C1, C2, C5, C6 and VR1.īut remember, the value of C1 is equal to C5, and C2 is equal to the value of C6. If you do not like tone of that treble sound. Because changes in the resistance of VR1/1 are equal to the resistance of VR1/2.Īnd must use C1 is equal C5, C2 is equal C6. So we use the VR1 is Dual Audio Potentiometer. So, controlling the treble of the left headphone is equal to the treble of the right headphone. We adjust the VR1/2 adjusts to control the treble for headphone channel right.ģ. The similar a right way, the C5, C6 and VR1/2 are set the input audio signal to high frequency up. The VR1/1 adjusts the treble for the left headphone.Ģ. There are C1, C2, and VR1/1 are set the input audio signal to high frequency up. To begin with, this circuit will connect the switch-S1, to apply the power supply to the circuit and the input has an audio signal source.ġ. Is it impossible? Most tone control circuit requires a 12V power supply. If you want to adjust the tone of audio in low voltage states for a HEADPHONE.
Components layout of Stereo pre tone control using 2 transistors Headphone Bass-Treble control circuit with PCB
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