Showing posts with label filter. Show all posts
Showing posts with label filter. Show all posts
Monday, July 29, 2013
Antialiasing And Sync Compensation Filter Circuit Diagram
Antialiasing And Sync-Compensation Filter Circuit Diagram. Two dual-bi-quad filter chips and some external components form a multipurpose filter to reconstruct D/A converter signals. Connected to a converter`s output, the filter provides anti-aliasing, reduces the D/A converter`s quantization noise, and compensates for sin(7rx)()—the `sync` function (attenuation). The circuit incorporates an inverse-sync function that operates to one-third of the converter`s sample rate. Beyond one-third, the filter`s response shifts to a stop band filter, which provides -70 dB attenuation.
This attenuation conforms to the converter`s inherent signal-to-noise ratio and quantization error. To prevent aliasing, the stop band edge must be no higher than the Nyquist frequency (/„ + 2). To achieve 70-dB stop band rejection with this eighth-order filter requires a transition ratio (/stop band -K/pass band) of 1.5, which sets the passband`s upper limit at fs +3. Notice also that you can apply a simple divide-by-64 circuit to the 192-kHz clock frequency to set the necessary 3 ratio between the converter`s sample rate and the filter`s 1-kHz corner frequency.
Antialiasing And Sync-Compensation Filter Circuit Diagram
Wednesday, May 1, 2013
Simple Subwoofer Lowpass Filter using uA741 Single Op Amp Ic
This is the simplest Sub woofer Low Pass filter Circuit using uA741 single op amp ic. The circuit is very low cost with respect to their work. The cut off frequency of this circuit is 25Hz to 80Hz maximum. Using this circuit , you can easily design a 2.1 Sub-woofer Speaker System at your own Home. The circuit contains very few components.In Pakistan, the cost of this circuit with PCB is Rs:45 The same circuit is working in my own hand made sub-woofer system.
R1,R3,R4 = 10K 1/4W
R2=100K 1/4W
CY1,CY2 = 0.22uF Polyester
C1,C2 = 10uF/25V Electrolytic
IC1 = uA741A Single Op-Amp Ic + 8 Pin Ic Socket
3 Pin Male & Female Connector x 2
2 Pin Male & Female Connector x 1
PCB as in required size 4.5 cm x 3.4 cm
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