Crossower Preamplifier devresi

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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.

The values of capacitors and resistors varies depending on the selected connection that your device works. The filter outputs are fed to a balancing network made by R8, R9, RIO, R14 and potentiometer RLL balance. When the potentiometer is at its center position, there is a unity gain bandwidths for both high and low filters. Power for the electronic circuit is regulated by Crossover R12, RI3, Dl and D2, and decoupled by C6 and C7.

 

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Active Crossover Circuit
Description:
Crossover circuits are of two types, active and passive. Passive crossover circuit uses passive components only and they are very simple, but they waste a considerable amount of energy and also induce distortion. Active crossovers does not have the above said draw backs and they are a better option for HiFi audio systems. Active crossovers split the incoming complex audio signal into to two bands, a low frequency out and a high frequency out. These two bands a separately amplified by two power amplifier stages, one tuned to the low frequency band and the other tuned to high frequency stage respectively (bi-amping).

The cross over circuit given here uses LM833 National Semiconductors. LM833 is a dual operational amplifier especially designed for audio applications. The circuit requires four opamps and so two LM833 ICs are used here. The circuit can be divided into two parts, a high pass filter section and a low pass filter section. IC2b forms a first order Butterworth low pass filter circuitry and the low frequency out is available at its output pin (pin1). The high frequency out is available at pin 7 of IC1a. For the given components crossover frequency is 1KHz and it is according to the equation Fc = 1/(2πRC).

Active Crossover Circuit Diagram:
Notes:

• Assemble the circuit on a good quality PCB.
• The circuit can be powered using a +15/-15 V DC dual supply.
• LM833s must be mounted on holders.
• R and C can be changed for getting different crossover frequencies.

 

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3-Way Active Loudspeaker

 

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Subwoofer booster circuit with PCB Layout

Subwoofer booster circuit is used to enhancing or boosting or increase the subwoofer amplifier, but it also can improve the quality of the bass sound on an amplifier or High Power Amplifier. Subwoofer booster circuit/bass enhancer circuit based on the IC 4558 and TL074 or commonly known as IC op-amp, it's suitable to be a boosting in subwoofer system, which together with some components.


Subwoofer booster circuit
Part List Subwoofer booster circuit:

R1=22K, R2=100K,
R3=220R,
R4=220R,
R5=220R,
R6=10K,
R7=4K7,
R8=1K,
R9=20KTrim,
R10=150K,
R11=22K,
R12=20K Trim,
R13=4K7,
R14=2K2,
R15=220R,
R16=220R,
R17=180K,
R18=22K,
C1=4u7/25V,
C2=10uF/25V,
C3=220uF/25V,
C4=220uF/25V,
C5=1n2,
C6=47n,
C7=47n,
C8=100n,
C9=100n,
C10=4u7/25V,
C11=330uF/25V,
C12=330uF/25V,
IC1=JRC4558,
IC2=TL074

For this subwoofer booster/enhancer circuit using voltage of 12 V +, 12V -, and ground. To be in accordance with the power of the speakers and amplifiers, the Subwoofer booster circuit/subwoofer enhancer is also equipped with a subwoofer volume setting on the R9 and R12 use 20 K ohm trim. Issued a circuit of subwoofer output is quite high, making it suitable for some speakers.