This is the First Simple tone control circuit for you. Since easiest to builds all components are assembled on one PCB, so small size and cheapest. I like the transistors pre amplifiers with tone controls. Because of low noise and classic not outdated. For students, college students took the basic tone control circuit in particular. But it can really use!
The tone controls, this is not acceptable. Due to high-quality audio professionals not to use it. Connect popular Audio directly without a sound barrier. But this system is the most important parameter is the speaker. Your speakers must be highly sensitive, can resonance all audio frequencies range. But in reality, it is very difficult. To find speakers that feature.
Alternatively, designing the sound in the past use the tone control a solution of this speaker is to increase the treble, bass boost. In this project is easy and try more as Figure 1
Figure 1: simple tone control circuit diagram
Working of simple tone control
Working with 2 sections, the power supply, and the tone controls. First, the power supply has diodes D1-D4 is connected as bridge rectifier so can apply power all type AC/DC. Then, there is capacitors-C12 serves to filter the voltage. Next, will into the voltage control circuit, by having Q4, ZD1, R14, C11 serves to maintain constant voltage as DC Regulator. Then a C10 helps filter with together.
Come to the tone audio adjustable. The input signal is input to VR1, VR2 through R1, C1 to the base of Q1 by having R2-R6 to control working. Then, the signal will be sent to the base of Q2 by have R5, R7 are biased working. And the signal will through to C2 to the network circuit, the adjust base-treble by VR4, VR5.
The treble sound includes R9, C5, VR4 controls, and the bass controls include R8, C3, C4, VR3. Then, the signal will be sent to C6 and increased up by Q3 which include R10-R13, C7 as a low signal amplifier. The C8 is a feedback frequency offset. Next, the signal to C9 as the output signal to the power amplifier next step.
The feature main
This tone can adjust high-frequency very good, sound bright. And no the loudness controls The boost of bass and treble completed, so cut it out.
The design allows for easy builds and use. We put RCA and DC jack and all potentiometers. We only use the RCA cable and apply small AC or DC adapter about 300-500mA to this only.
How to build it
Parts you will need
Resistors ¼ watts +5%
VR1_100KA Dual Audio Potentiometer
VR3, VR4_100KB Dual Audio Potentiometer
C1, C2, C6, C9, C11_3.3μF/16V Electrolytic
C3, C4_0.03μ3F mylar
C7_47μF 16V electrolytic
C8_47pF 50V Ceramic
C10_100μF 16V Electrolytic
C12_2,200μF 16V Electrolytic
PCB, jacks RCA, jack DC, adapter, etc.
Note These many Electronics students like but hard to builds for a beginner.
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