Tl084 bass treble circuit

Tl084 bass treble circuit


  • Passive tone control circuit
  • Audio Mixer With Multiple Controls
  • Build a Great Sounding Audio Amplifier (with Bass Boost) from the LM386
  • 5 Tone control circuits using op-amp NE5532
  • Turbo bass circuit
  • Passive tone control circuit

    Passive tone control circuit Tone control circuit. This is just another circuit designed by Mr. Seetharaman Subramanian and time it is a high quality passive tone control circuit that has an overall gain of around 25 with 20dB boost and cut.

    This circuit needs minimum number of components, is very cost effective and most of the components required can be found from you junk box. The circuit consists of two parts. Firstly an op-amp based preamplifier stage and secondly a passive Baxandall tone control circuitry. The preamplifier stage is a non inverting amplifier based on TL R2 is the feedback resistor which together with resistor R1 sets the gain of this stage and with the stated values it is Value of R3 Rin is taken as approximately equal to the output impedance of TL C2 is the input DC decoupling capacitor and it also sets the low frequency cut off limit.

    R4 is the offset minimizing resistor which reduces the effect of output offset voltage on the output of the amplifier and its value is taken as approximately equal to R1 R2. Capacitor C3 couples the preamplifier stage with the tone control stage. The tone control stage is a passive Baxandall tone control circuit that can produce a 20dB cut or boost. Resistor R8 provides some isolation between the bass control and treble control stages. Passive Baxandall tone control circuit: Also known as James Network is a circuit for independently adjusting the bass and treble for high quality audio applications.

    The circuit is entirely based on passive components and the performance is very superior. In many older passive tone control circuits there was much interaction between the two controls and there was a great deal of asymmetry.

    Such problems are completely eliminated in Baxandall tone control circuit. Circuit diagram. Dual supply for this circuit. Bridge D1 can be made using four 1N diodes. This supply is unregulated and its quite fine for this circuit. Anyway if you need to have a regulated one please inform me. Power supply for tone control circuit Notes.

    Circuit can be assembled on a vero board or perf boad. Any way a PCB is the best option. IC1 TL must be mounted on a holder. By changing the value of R1 and R2 the voltage gain Av of the preamplifier stage can be changed. TL pin out.

    Whether it is for a party, a meeting, or just to listen to full Hi-Fidelity, this amplifier will do a perfect job. This Stereo amplifier circuit is easy to build and will provide amazing audio power and extremely low total harmonic distortion. They are coupled to U1A via C1, R1. As shown, they are in the OFF no boost position. R2 and C2 are shorted out by S4 canceling the bass boost.

    S1 is open which defeats the treble boost. If switch S3 is closed, then C3 is in parallel with R1 and boosts the treble gain at a break frequency of 2. If switch S4 is opened, then the feedback loop has an additional gain 16, and a low pass break frequency of Hz. The Bass control has a break frequency around Hz and a gain of around 16 db. The Treble control has a break frequency around Hz and a gain of 15 db.

    The output of U1B is connected by R11 to the balance control which has a grounded wiper. This decreases or increases the output of the Right and Left channels in an opposite manner to balance the signal level of a common input to both channels. Jack J7, is the Power-Amp input jack.

    If desired, an effects processor, graphic equalizer or other audio processor can be inserted in the signal chain between jacks, J5 and J7, to further enhance the signal.

    Switch S5, when closed, combines the Right and Left channels for Mono operation. This is useful for a single channel mic input, or mono input, to enable sound to come out of both speakers, Right and Left. The signal is passed through C6, C7, which are wired to form a 5 uF non-polar capacitor, to the volume control, R The wiper of R14 passes the desired signal level through R15 to the positive input, base of Q3 , of the power op-amp stage.

    Q3 and Q4 form the differential input pair of the power op-amp. D8, C8, R18, and R19 isolate the negative voltage rail and act as a current source to transistors, Q3, Q4.

    Transistor Q5, performs as a level shifter to drive the quasi-complimentary, cascode output pairs formed by transistors Q6, Q7 and transistors Q8, Q9 respectively. Diode D7 and R22 provide the correct bias voltage separation to provide about 10 to 20 mA of idle current through the output stage transistors and resistors R25, R This ensures that there is no cross-over distortion in the output signal, because the cascode output transistor pairs are actively conducting at the crossover transition.

    Capacitor, C11 and resistors, R23, R24, form a bootstrap bias network that provides the negative bias to cascode transistor pair Q8, Q9, during the negative half cycle of the signal waveform. Thus a. The main power supply consists of transformer T1, D1 — D4 form a full-wave bridge rectifier which is filtered by capacitors, C18, C Switch S6, Enables or Disables the speakers.

    Resistor R30 reduces the output before it is connected to the stereo headphone output jack not shown. Use dual controls for Treble, Bass and Volume.

    A 2P4T 2-pole, 4-throw, position rotary switch to select sound signal source. Treble and Bass controls are linear taper. The volume control is audio taper.

    The tone control stage is a passive Baxandall tone control circuit that can produce a 20dB cut or boost.

    Audio Mixer With Multiple Controls

    Resistor R8 provides some isolation between the bass control and treble control stages. Passive Baxandall tone control circuit: Also known as James Network is a circuit for independently adjusting the bass and treble for high quality audio applications. The circuit is entirely based on passive components and the performance is very superior.

    In many older passive tone control circuits there was much interaction between the two controls and there was a great deal of asymmetry. Such problems are completely eliminated in Baxandall tone control circuit. Circuit diagram. Dual supply for this circuit. Bridge D1 can be made using four 1N diodes.

    Build a Great Sounding Audio Amplifier (with Bass Boost) from the LM386

    This supply is unregulated and its quite fine for this circuit. Anyway if you need to have a regulated one please inform me. Power supply for tone control circuit Notes. Circuit can be assembled on a vero board or perf boad. Any way a PCB is the best option. The Treble control has a break frequency around Hz and a gain of 15 db. The output of U1B is connected by R11 to the balance control which has a grounded wiper. This decreases or increases the output of the Right and Left channels in an opposite manner to balance the signal level of a common input to both channels.

    Jack J7, is the Power-Amp input jack.

    5 Tone control circuits using op-amp NE5532

    If desired, an effects processor, graphic equalizer or other audio processor can be inserted in the signal chain between jacks, J5 and J7, to further enhance the signal. Switch S5, when closed, combines the Right and Left channels for Mono operation.

    This is useful for a single channel mic input, or mono input, to enable sound to come out of both speakers, Right and Left. The signal is passed through C6, C7, which are wired to form a 5 uF non-polar capacitor, to the volume control, R The wiper of R14 passes the desired signal level through R15 to the positive input, base of Q3of the power op-amp stage. Q3 and Q4 form the differential input pair of the power op-amp.

    Turbo bass circuit

    D8, C8, R18, and R19 isolate the negative voltage rail and act as a current source to transistors, Q3, Q4. Transistor Q5, performs as a level shifter to drive the quasi-complimentary, cascode output pairs formed by transistors Q6, Q7 and transistors Q8, Q9 respectively. Diode D7 and R22 provide the correct bias voltage separation to provide about 10 to 20 mA of idle current through the output stage transistors and resistors R25, R This ensures that there is no cross-over distortion in the output signal, because the cascode output transistor pairs are actively conducting at the crossover transition.

    Capacitor, C11 and resistors, R23, R24, form a bootstrap bias network that provides the negative bias to cascode transistor pair Q8, Q9, during the negative half cycle of the signal waveform. Thus a.


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