The resistor values in the above schematic will give a gain of 2 and a Q of 5 at frequencies of 31.25, 62.5, 125, 250, 500, 1000, 2000, 4000, 8000 and 16000 cps.
Different frequencies, Q and gain are available on special order. Please contact us for more infomation.
10-band Audio Bandpass Filter PCB Technical Information
Our audio bandpass filter is ideal for designing your own equalizer with one channel of 10 frequencies, as a building block for an audio spectrum analyzer or for other devices where a 10-band audio filter is needed.
Circuit design: Multiple-Feedback Bandpass Filter
Design frequencies: The design is for frequencies at octave spacing, starting at 31.25cps and going up to 16000cps. The usual frequencies in cps are: 31.25, 62.5, 125, 250, 500, 1000, 2000, 4000, 8000 and 16000cps. However, other frequencies, Q and gain are available.
Frequency accuracy: Plus-or-minus 3% of center frequency (using 1% resistors and matched capacitors).
Frequency response of the filter is +/-0.4db from 31 cps to 16kcs.
Designed Filter Q: Choice of 2, 3, 4, or 5 (Should not exceed 5)
With a signal input of 100mv the preamplifier gain plus filter gain is a maximum 28db when the frequency of the input signal is tuned to the frequency of the individual filter. The preamp gain may be controlled by the on-board POT.
Input impedance at 1kc is >150,000 ohms
Op Amps: TL074CN
Input signal: 100mv (typical)
Power: On-board "rail splitter" circuit allows the use of a single polarity power supply (20 to 24 VDC at 100 ma) while having the advantages of a dual rail power source to the TL074 chip.
Size: 2.5" (63.5mm) x 7.2" (182.9mm)
Construction: Silk screen on component side and solder mask on both sides. PCB is made from FR4 material and is Lead Free.
Output interface: 10-pin terminal block.
Grounding Interface: Separate 5-pin terminal block for signal grounds with additional provision for two hard-wired (soldered) connections.