Tone control circuit
It is a high quality passive tone control circuit with a 20dB boost and a circuit that reduces the total gain design by approximately 25. This circuit, which requires a minimum number of components, is very cost effective and most of the required components can be found from your trash box. One is the OPAMP of the active component, even if it is used in the circuit, the tone control part is completely passive, which is why the circuit is named as such.
Description
The circuit consists of two parts. First based on an op amp preamplifier and a second passive Baxandall tone control circuit. The preamplifier is the basis of a non-inverting amplifier TL072. R2 is the feedback resistor and resistor R1, the gain setting at this stage, and the specified value is 23. The voltage gain in the non-inverting mode indicates the use of the equation AV = 1 + (R2/R1). The output impedance of TL072 is approximately equal to the value of R3 (RIN). C2 is the input DC decoupling capacitor and also sets the low frequency cut limit. R4 is the minimum resistance of the offset, which reduces the effect of the output offset voltage of the output of the amplifier, which is approximately equal to R1 | | R2. The preamplifier is powered by a 15 / -15 dual supply. Capacitor C3 couple preamplifier, tone control stage.
The tone control phase is a passive Baxandall tone control circuit that produces 20 dB of attenuation or enhancement. The pot R6 is a pot for the R9 that can be used to control the treble control, bass. The pot R10 serves, while the pot R11 can be used to adjust the balance volume control. Resistor R8 provides some bass control and isolation between the treble control stages.
Passive Baxandall tone control circuit: Also known as James Network is a circuit that independently adjusts the bass and high quality audio application treble. The circuit is extremely well based on the performance of passive components. In many old passive tone control circuits there is interaction between the two controls and there is a great deal of asymmetry. These problems are completely eliminated in the Baxandall tone control circuit.
Circuit diagram
Passive tone control circuit
Seetharaman's words circuit: IAM just encloses your TL072 (TL062 or 82, also available) with 20dB to improve passive tone control and cut the total gain of about 25 people. If desired, you can also give an overall feedback from the output to the TL072 through the inverting input of the appropriate resistor.
The circuit is powered by dual supplies.
Below is a dual power supply powered by a 15 V/-15V tone control circuit. Bridge 1 can use four 1N4007 diodes. This supply is unregulated and the circuit is fine. Anyway, if you need to be regulated, please let me know.
Tone control circuit power supply
Precautions
The circuit can be assembled on a VERO board or a PERF West Africa line. PCB in any way is the best choice.
15 / - 15V DC dual power supply, power supply circuit.
The holder must be installed on IC1's TL072.
It is possible to change by changing the value of R1 and the voltage gain (AV) of the preamplifier of R2.
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