Active Crossover Circuit
Given below is an Active crossover circuit suitable for HiFi audio systems using LM833, the dual operational amplifier.
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:
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