The online source datasheets for electronic components and semiconductors, especially for obsolete parts.
Wednesday, August 7, 2013
The Electronic Crossover Circuit
The Electronic Crossover CircuitAn audio source, such as a
mixer, preamplifier, equalizer, or recorder, is fed to the Electronic Crossover
Circuit’s input. That signal is either ac- or dc-coupled, depending on the
setting of switch S1, the non- inverting input of buffer-amplifier U1a, one
section of quad, BIFET, low-noise TL074 op amp made by Texas Instruments. That
stage has a gain of 2, and its output is distributed to both a low-pass filter made by R4, R5, C2, C3, and op-amp U1d, and a
highpass filter made by R6, R7, C4, C5, and op amp U1c. Those are 12dB/octave
Butterworth-type filters. The Butterworth filter response was chosen because
it gives the best compromise between damping and phase shift. Values of
capacitors and resistors will vary with the selected crossover at which your unit
will operate. The filter's output are fed to a balancing
network made by R8, R9, R10, R11 and balance potentiometer R14. When the
potentiometer is at its mid-position, there is a unity gain for passbands of
both the high and low filters.
DC power for the Electronic Crossover Circuit is regulated by R12, R13, D1 and D2. and decoupled by C6 and C7
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