High quality tone control circuit low noise

SEE! Many Tone control circuit, it is an important circuit for control bass and treble effects in the audio output.

We have a list of top 7 tone control circuit which is an effective low noise tone control circuit.

All components you can buy Parts used in this circuit are easily available in most of the local markets. And easy to builds with PCB layouts. LEARN MORE NOW!

Which includes all 7 projects below

3 Transistors Pre Tone Control Circuit

Here is a classic Tone control circuit. It uses a low noise transistor model. Which this circuit is interesting. Because of the transistor entirely. Then have a voice good and economize good.

See in the circuit below.  this uses transistor 3 pcs. For pretend pre-tone model mono, if you want to use are the system stereo. As a result building, this circuit enhances again the group only.

Classic Tone control circuit with low noise transistor
3 Transistors Pre Tone Control Circuit


The prominent point of this circuit again type, be use power supply source good wide be about 9V – 18V and should be DC regulator with. The detail is other friends see in the circuit adds yes.

Classic Tone Control using 2 Transistors C945

This be tone control circuit ,The small-sized. It the character Mono by use transistor just 2 PCS important equipment performs to enlarge sound signal gives the power goes up ,and have a button fines to decorate the sound completely.

It be fine decorate the popularity in the sound , fine decorate the treble , and fine decorate the bass as well.

The circuit diagram of Classic Tone Control using 2 Transistors C945
Circuit diagram of Classic Tone Control using 2 Transistors C945


It is convenient for a novice wants to try to build a Pre Tone control circuit to keep be usable. The prominent point of this circuit be seek the equipment easily, Electronic part replaces can be finished or can antique sheep come to use all right, such as The transistor number C828 may use the number C945 or C1815 or The other all right.

For the level power supply also get wide be about 12V to 24V at 50mA you can see other detail in the circuit.

The PCB layout and components layout of Classic Tone Control using 2 Transistors C945
The PCB layout and components layout of Classic Tone Control using 2 Transistors C945

Stereo Tone Control using 2 transistors C945

This circuit Tone Control Stereo, 2 Transistor : C945 = 2 part.
Supply Volt min 12V <80mA. Easy to build, PCB small.

The Circuit of Tone Control Stereo using C945x2 Transistors
The Circuit of Tone Control Stereo using C945x2 Transistors


PCB Tone Control Stereo using C945x2 Transistor
PCB Tone Control Stereo using C945x2 Transistor


Simple Tone control circuit projects

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

the schematic diagram of first tone controls

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

the PCB layout
First, make the PCB as Figure 2 the PCB layout

the component layout
Then assemble all parts on PCB as Figure 3 the component layout


Parts you will need
Resistors ¼ watts +5%
R4, R6_15K
R8, R13_5.6K

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
C5_0.0047μF mylar
C7_47μF 16V electrolytic
C8_47pF 50V Ceramic
C10_100μF 16V Electrolytic
C12_2,200μF 16V Electrolytic
ZD1_9V 0.5W
PCB, jacks RCA, jack DC, adapter, etc.

5 Transistors High Quality Tone Control Circuit with low noise

Five Transistors High Quality Tone Control Circuit with low noise
5 Transistors High Quality Tone Control Circuit


Designing power amplifier Circuit is high quality. The some is the thing that must think over most. Be Pre tone control circuit, but friends must not worry. I have this circuit that it transistor all work in feeding character gets back to model specialty. Be use Constant Current source be something bias that get from LED help have the stability in manner temperature work of Q1 and Q2 improve. The input can take a signal has since 100mV-1V don’t fear about Over Load, and the crazy low very. For other equipment can choose use general equipment. By sound quality still use well yes.

OLD Tone control circuit using 4 low noise transistors

If you have electronics old equipment, keep many long ago year, unknow build Electronic Project good. I begs for to advise pre tone control circuit this. By it can fine to decorate the sound Bass,Treble and Volume well.There is the prominent point that use transistor, But be of good quality of good sound doesn’t be defeated the circuit that uses the integrated circuit. By the thing that me observes clear, be the noise is low, bland sound are good. from your circuit can use transistor number C945 or C828 or C1815 can replace. Which the price is inexpensive the hardware is other may get not difficult. The power supply , should choose that be model dc regulator 12V to 24V building may use PCB a bird purposes all right which , good easy.

OLD Tone control circuit using 4 low noise transistors

Classic Tone control circuit using 3 Low noise transistors

This tone control circuit diagram of the home audio stereo is very well. It low noise and sound is beautiful because use the quality transistor.

In picture we used three transistor number are C945 or C828 or C1815 or C458 They are old electronic components but useful now. They are mono form if you want stereo system, to make two section R+L. The VR1 is 100kB for finning treble tone sound. The VR2 is 100K for finning bass tone audio as well. The VR3 is 100Ka for control volume output. The VR4 is 100KW for control balane sound fo other channel. The power Supply Voltage used min 12V and min than 80mA .

We hope this circuit will be do you are enjoy a home audio. good luck.

The Schematic Diagram of Classic Tone control using 3 Low noise transistors

The Schematic Diagram of Classic Tone control using 3 Low noise transistors

The PCB layout of Classic Tone control using 3 Low noise transistors
The PCB layout of Classic Tone control using 3 Low noise transistors

High quality Tone Control Mono using 5 Transistors C945

I am interesting about stereo amplifier high quality. My father tell me it must hear sound well, low noise and so loudly.

Usually audio tone control made with a transistor that low noise , but less power than used IC systems. I think this circuit will be that because it has four transistors in diagram.we can also use to boost up a little audio signal.

In the image circuit is mono form. The transistors has five, number C945 or C1815 or C828 . I hope you can find it at general electronic store or inside an old pcb. You can use the power supply source during voltage 12V to 24V at minimum current at 100mA.
The picture no. 2 is PCB diagram for make this project, it small size so easy to use. You can use StripBoard-3U Uncut Strips 1 Sided PCB because it has a few components.

Circuit Diagram of High quality Tone Control Mono using 5 Transistors C945

Circuit Diagram of High quality Tone Control Mono using 5 Transistors C945

PCB layouts of High quality Tone Control Mono using 5 Transistors C945

PCB layouts of High quality Tone Control Mono using 5 Transistors C945

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It worked great but the treble could not be heard clearly.


dear students plz c this circuits and dnt mis use this circuit


hi l am benjamin form ghana i lake to do eletronic bat i need a help whit componet. ido not have maney to bye so pelese help me


mine is not working…. all the components are complete but there is no sound…. let me check admin transistors are c945 which is npn in the a561 pnp?? i dont know where i wrong.. this is my 3rd time building ma own circuit… this is only not working.. can i ask u mensah can u sent me ur photo on this circuit.. please… ty


really want a 5 transistor amp –using Only available BC 547/557 TRANSISTORS—






I like how concise your notes are. It is one of greatest dreams to build an audio amplifier myself but unfortunately , I the basic knowledge about ;

oscar li

Its work fine , I used 4 x 2N3904 and
1 x 2N3906 for TR-3


y mine s not workng…fdbak some trobleshotng plz…i used cap 10uf/16v @ ur layout 10uf/10v…s dat ok??..


Do you have any video of that? I’d want to find out some additionaal information.

Harry Layne BSc.

It always seems to work much better if you use a separate Input amplifier, conected to a Tone control [baxandall] circuit, which is in turn connected to a output stage which feeds the main amplifier. You do not need high power amplifiers for home use, Ten Watts [x2] of stereo sound is plenty and also cheaper to run. The more power you use the easier it is to generate more distortion. A distortion figure of up to .1% is very acceptable. I have used this system for many years with trouble free operation. My frequency response is 10HZ to 50KHZ.… Read more »


thanks ..


hey, great, can i use this 7 number pcb in my 200 watt rms power subwoofer??


So awesome frequency response and fidelity. I adopt this setup to hi fi PA sound enhancement tecnique with stereo studio master PA amp. Thanks.



Abdul Malik

you are great person in a world, because you are sharing best knowledge for others

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