Showing posts with label filter. Show all posts
Showing posts with label filter. Show all posts
Wednesday, November 19, 2014
Filter freq dirty from an fm transmitter
Low pass filter is a circuit to filter freq dirty from an fm transmitter. so we get a clean signal. and can maximize the output power generated from the booster. low pass filter is capable to 150 watts. in this post . file [lay] that can only be opened with software sprint layout. for those interested please download here.
Wednesday, September 10, 2014
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 schema is very low cost with respect to their work. The cut off frequency of this schema is 25Hz to 80Hz maximum. Using this schema , you can easily design a 2.1 Sub-woofer Speaker System at your own Home. The schema contains very few components.In Pakistan, the cost of this schema with PCB is Rs:45 The same schema is working in my own hand made sub-woofer system. So Try this [Link]
Parts List:
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
Tuesday, August 19, 2014
Basic Low Pass Filter
Low pass filter is a low-pass filter with low frequency signals but attenuates (reduces the amplitude of) signals with frequencies higher than cutoff frequency. The actual amount of damping for each frequency varies from filter to Filtering.
Sometimes called-high-cut filter, or treble cut filter when used in audio applications. Low-low pass filter is the opposite of the band-pass filter.
Sometimes called-high-cut filter, or treble cut filter when used in audio applications. Low-low pass filter is the opposite of the band-pass filter.
| Low Pass Filter Basic Circuit |
The concept of low-pass filter exists in many forms, including electronic circuits (like a hiss filter used in audio), digital algorithms for smoothing data sets, acoustic barriers, blurring the image, and so forth.
Monday, August 11, 2014
Voice Bandwidth Filter
This schema passes frequencies in the 300Hz - 3.1kHz range, as present in human speech. The schema consists of cascaded high-pass and low-pass filters, which together form a complete band-pass filter. One half of a TL072 dual op amp (IC1a) together with two capacitors and two resistors make up a second-order Sallen-Key high-pass filter. With the values shown, the cut-off frequency (3dB point) is around 300Hz. As the op amp is powered from a single supply rail, two 10kO resistors and a 10µF decoupling capacitor are used to bias the input (pin 5) to one-half supply rail voltage.
Voice Bandwidth Filter Circuit DiagramThe output of IC1a is fed into the second half of the op amp (IC1b), also configured as a Sallen-Key filter. However, this time a low-pass function is performed, with a cut-off frequency of about 3.1kHz. The filter component values were chosen for Butterworth response characteristics, providing maximum pass-band flatness. Overall voltage gain in the pass-band is unity (0dB), with maximum input signal level before clipping being approximately 3.5V RMS. The 560O resistor at IC1bs output provides short-schema protection.
Author: M. Sharp
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