Tone Balance

Stereo Preamplifier with balance and loudness

Stereo Preamplifier with balance and loudness

The circuit of preamplifier use the 5533 chip and features a combination of controls balance and volume. Due to the nonlinearity of the human auditory system, low frequencies must be boosted at low listening levels. Level pay, and LOUDNESS controls provide all the plays to produce the desired response from the music. ..

Fully adjustable preamplifier

Fully adjustable preamplifier

This circuit is a audio preamplifier tha has balance, tone and loudness controls. It should be suitable as an example of good design for audio application. Uses the BAA730 and NE540 chips. ..

Active crossover circuit with TL074

Active crossover circuit with TL074

An audio source, like a mixer, preamp, EQ, or a recorder, is fed to the input of the Electronic Crossover Circuit. This signal is either AC or coupling, depending on the setting of switch 51, the non-inverting input of buffer amplifier Ul-a, a section of a quad BIFET, low amp TL074 noise made by Texas Instruments op. This stage has a gain of 2, and its output is distributed to both a low pass filter made by R4, R5, C2, C3, and Uld op-amp, and a high-pass filter made by R6, R7, C4 , C5, and op amp ULC. These are12 dB / octave Butterworth filters. The response of the Butterworth filter was chosen because it gives the best compromise between the damping and phase. ..

Electronic potentiometer schematic

Electronic potentiometer schematic

Electronic potentiometer using a standard CMOS logic and analog multiplexers. Pot have low distortion (0.005% less at 1 V rms) and is it easy for beginers to Understanding. In the beginning the art Hi-Fi when in the absence of high-quality potentiometers for volume control using resistive divider, the various stages of the change lever mnohapolohovým switch. Figure 1 is the electronic equivalent of such a volume control. Instead I used a mechanical switch CMOS analog multiplexers. EN signal is collected by either a multiplexer, and so we have 16 steps. ..

Tone Control circuits

Tone Control circuits

There are two types of tone control circuits, passive and active. The passive kind consist of the pots, resistors and capacitors. There is an amplifier tube before the tone circuit and another tube amplifier after the tone circuit but there are no tubes directly involved in the tone control circuit itself. In the active kind there are amplifying devices involved in the tone control circuit. A circuit which looks the same as a passive circuit is placed in the feedback loop of an amplifier stage. This kind of circuit is common place in semiconductor based amplifiers because the amplifying devices take up little space and power. ..

Volume Control circuit

Volume Control circuit

Switch S2 is used for increasing and switch S3 is used for decreasing the volume. Similarly, switches S4 and S5 are provided for second channel (right channel) volume control. Also, pin 14 of IC2 can be connected to IC 74193 pin 14 (clear input) of the right channel volume control circuit. The volume control circuit of right channel will be identical to that of the left channel circuit (shown here) except that IC1, IC5 and push-to-on switches are not to be duplicated. A 1µF electrolytic capacitor (C4) is used to prevent switching noise. Resistors R8 and R6 are used to fix the quiescent operating voltage level at half the supply voltage for avoiding distortion of the audio signal from the preamplifier. ..

HiFi stereo preamplifier with tone control

HiFi stereo preamplifier with tone control

The preamp featured is very straightforward to make on the PCB, and has an innovative tone defeat function. Rather than completely disable the tone controls, they are massively de-sensitised, and when "defeated" have a maximum range as shown in Fig. 3 (below). This can be increased if desired, so you can have two tone control settings, one with the normal 10dB boost and cut, and the other with a very subtle 3dB boost and cut - this will be enough (surprisingly) for very minor adjustments such as you might need for day-to-day listening...

Advanced Volume control

Advanced Volume control

This circuit could be used for replacing your manual volume control in a stereo amplifier. In this circuit, push-to-on switch S1 controls the forward (volume increase) operation of both channels while a similar switch S2 controls reverse (volume decrease) operation of both channels. A readily available IC from Dallas semiconductor, DS1669 is used here...

Stereo Preamplifier and Bass-booster

Stereo Preamplifier and Bass-booster

This preamplifier was designed to cope with CD players, tuners, tape recorders etc., providing a gain of 4, in order to drive less sensitive power amplifiers. As modern Hi-Fi home equipment is frequently fitted with small loudspeaker cabinets, the bass frequency range is rather sacrificed. This circuit features also a bass-boost, in order to overcome this problem. You can use a variable resistor to set the bass-boost from 0 to a maximum of +16dB @ 30Hz. If a fixed, maximum boost value is needed, the variable resistor can be omitted and substituted by a switch...

Audio Tone control in Line amplifier

Audio Tone control in Line amplifier

This rule allows the amp volume, balance and tone controls to take. The circuit operates a specially designed IC, LM 1036. The advantage is that few external components and to control monopotmeters can be used, which are cheaper. The schedule speaks for itself. With S1, the loudness can be set. In the drawn position of the loudness. Furthermore, the IC TDA 1524A from Philips same options...

Audio tone control circuit

Audio tone control circuit

Here a simple design for an attractive tone. They operate on a passive principle, ie without amplification. The circuit only weakened and therefore require no power. As can be seen, the circuit is built with two T-filters in the same way as the active bass / treble tone control. Only is the right of the two filters are not at the output of an opamp, but mass. P1 and P2 adjusts the bass to the treble. To hear more bass, you need to P1 in the direction of rotation R1. Contrast to more high tones, you must P2 in the direction of rotation C3. Of course this is not a HiFi sound system, but it is best for small amps like the 250 mW amplifier. Note that the circuit operates at line-levels, they must to get the amp!..

Bass and Tremble Controller ( 741 )

Bass and Tremble Controller ( 741 )

Again, using the versatile IC 741. The feedback of this IC are two T-filters included the strengthening of the treble and bass influence. P1 is responsible for regulating the bass and treble controls P2. Where P1 to the direction of R1 is rotated, the enhanced bass. The circuit boosts the treble when P2 is turned to C6. This should be designing the PCB to be taken into account (normally, the right turn of a potentiometer eenversterking result). This tone control can be switched to different amplifiers. The power supply voltage should be between 9 and 12 volts down, the current consumption is several mA. If one is concerned about the audio quality of this 741 without modification to replace a TL081...

Balance input with Gain

Balance input with Gain

Circuit with electronic symmetrical input, with possibility of regulation of the gain from the pontesometer RV1 and the level of signal with the RV2. The quality of pontesometer RV1 (as other material), should be very good, in order to we avoid annoying noises and voids in the regulation of gain. Beyond the types IC that I give, it can be used any other type, is enough it fills the characteristics that should, as low noise, distortion etc. With the prices of circuit, the input resistance are near in the 2K?, with result, it's suitable for amplification of low level of signal (Microphone). For higher level signals, it will be supposed it is used attenuation the signal, with resistances, and for the two input sect?on, decreasing with this way, the regulation margins of gain, with the RV1. ..

Stereo sound balancer

Stereo sound balancer

It many times happens, we want erase or decrease in a musical song, the voice of singer or some other sound that usually is written in same level and in the two channels. If we remove between them two signals of channels, we can take in the output a mono signal without the voice. Here exist a problem. The sound of bass instrument is also this written in two channels. With this circuit, the bass they can be not removed, if it is added in the signal [ L+R ], the signal [ L-R ]. The signal of low frequencies and the signal of difference, are applied in adder IC3?. The balance between, regulated from the RV1-2. In the circuit do not exist capacitors in the line of signal, because add undesirable drift of phase in the signal of input. ..

3 Way Crossover -24dB

3 Way Crossover -24dB

e circuit, is a classic circuit of electronic crossover. Stand in for, the circuits of passive crossover that exist in all loudspeaker three way. The difference is in that, it should anymore we use for each loudspeaker a separate final amplifier. Thus for loudspeaker three way, it will be supposed we use six final amplifiers. This make has the negatives of cost and space that occupy the extra amplifiers. From other however the quality of repeated sound changes radically to best, one and the regulation on part of parameters that concerns each loudspeaker, it is much easier and technically feasible. In the particular circuit the signal that emanates from the exit of preamplifier, is applied in the IN and via the RV1 we regulate the total level...

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